**fix(auth): properly handle callback forwarder instance in WebUI requests**

v6.8.40

internal/api/handlers/management/auth_files.go

@@ -192,17 +192,6 @@ func startCallbackForwarder(port int, provider, targetBase string) (*callbackFor
 	return forwarder, nil
 }
 
-func stopCallbackForwarder(port int) {
-	callbackForwardersMu.Lock()
-	forwarder := callbackForwarders[port]
-	if forwarder != nil {
-		delete(callbackForwarders, port)
-	}
-	callbackForwardersMu.Unlock()
-
-	stopForwarderInstance(port, forwarder)
-}
-
 func stopCallbackForwarderInstance(port int, forwarder *callbackForwarder) {
 	if forwarder == nil {
 		return
@@ -644,28 +633,66 @@ func (h *Handler) DeleteAuthFile(c *gin.Context) {
 		c.JSON(400, gin.H{"error": "invalid name"})
 		return
 	}
-	full := filepath.Join(h.cfg.AuthDir, filepath.Base(name))
-	if !filepath.IsAbs(full) {
-		if abs, errAbs := filepath.Abs(full); errAbs == nil {
-			full = abs
+
+	targetPath := filepath.Join(h.cfg.AuthDir, filepath.Base(name))
+	targetID := ""
+	if targetAuth := h.findAuthForDelete(name); targetAuth != nil {
+		targetID = strings.TrimSpace(targetAuth.ID)
+		if path := strings.TrimSpace(authAttribute(targetAuth, "path")); path != "" {
+			targetPath = path
 		}
 	}
-	if err := os.Remove(full); err != nil {
-		if os.IsNotExist(err) {
+	if !filepath.IsAbs(targetPath) {
+		if abs, errAbs := filepath.Abs(targetPath); errAbs == nil {
+			targetPath = abs
+		}
+	}
+	if errRemove := os.Remove(targetPath); errRemove != nil {
+		if os.IsNotExist(errRemove) {
 			c.JSON(404, gin.H{"error": "file not found"})
 		} else {
-			c.JSON(500, gin.H{"error": fmt.Sprintf("failed to remove file: %v", err)})
+			c.JSON(500, gin.H{"error": fmt.Sprintf("failed to remove file: %v", errRemove)})
 		}
 		return
 	}
-	if err := h.deleteTokenRecord(ctx, full); err != nil {
-		c.JSON(500, gin.H{"error": err.Error()})
+	if errDeleteRecord := h.deleteTokenRecord(ctx, targetPath); errDeleteRecord != nil {
+		c.JSON(500, gin.H{"error": errDeleteRecord.Error()})
 		return
 	}
-	h.disableAuth(ctx, full)
+	if targetID != "" {
+		h.disableAuth(ctx, targetID)
+	} else {
+		h.disableAuth(ctx, targetPath)
+	}
 	c.JSON(200, gin.H{"status": "ok"})
 }
 
+func (h *Handler) findAuthForDelete(name string) *coreauth.Auth {
+	if h == nil || h.authManager == nil {
+		return nil
+	}
+	name = strings.TrimSpace(name)
+	if name == "" {
+		return nil
+	}
+	if auth, ok := h.authManager.GetByID(name); ok {
+		return auth
+	}
+	auths := h.authManager.List()
+	for _, auth := range auths {
+		if auth == nil {
+			continue
+		}
+		if strings.TrimSpace(auth.FileName) == name {
+			return auth
+		}
+		if filepath.Base(strings.TrimSpace(authAttribute(auth, "path"))) == name {
+			return auth
+		}
+	}
+	return nil
+}
+
 func (h *Handler) authIDForPath(path string) string {
 	path = strings.TrimSpace(path)
 	if path == "" {
@@ -899,10 +926,19 @@ func (h *Handler) disableAuth(ctx context.Context, id string) {
 	if h == nil || h.authManager == nil {
 		return
 	}
-	authID := h.authIDForPath(id)
-	if authID == "" {
-		authID = strings.TrimSpace(id)
+	id = strings.TrimSpace(id)
+	if id == "" {
+		return
 	}
+	if auth, ok := h.authManager.GetByID(id); ok {
+		auth.Disabled = true
+		auth.Status = coreauth.StatusDisabled
+		auth.StatusMessage = "removed via management API"
+		auth.UpdatedAt = time.Now()
+		_, _ = h.authManager.Update(ctx, auth)
+		return
+	}
+	authID := h.authIDForPath(id)
 	if authID == "" {
 		return
 	}
@@ -2549,6 +2585,7 @@ func PopulateAuthContext(ctx context.Context, c *gin.Context) context.Context {
 	}
 	return coreauth.WithRequestInfo(ctx, info)
 }
+
 const kiroCallbackPort = 9876
 
 func (h *Handler) RequestKiroToken(c *gin.Context) {
@@ -2685,6 +2722,7 @@ func (h *Handler) RequestKiroToken(c *gin.Context) {
 		}
 
 		isWebUI := isWebUIRequest(c)
+		var forwarder *callbackForwarder
 		if isWebUI {
 			targetURL, errTarget := h.managementCallbackURL("/kiro/callback")
 			if errTarget != nil {
@@ -2692,7 +2730,8 @@ func (h *Handler) RequestKiroToken(c *gin.Context) {
 				c.JSON(http.StatusInternalServerError, gin.H{"error": "callback server unavailable"})
 				return
 			}
-			if _, errStart := startCallbackForwarder(kiroCallbackPort, "kiro", targetURL); errStart != nil {
+			var errStart error
+			if forwarder, errStart = startCallbackForwarder(kiroCallbackPort, "kiro", targetURL); errStart != nil {
 				log.WithError(errStart).Error("failed to start kiro callback forwarder")
 				c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to start callback server"})
 				return
@@ -2701,7 +2740,7 @@ func (h *Handler) RequestKiroToken(c *gin.Context) {
 
 		go func() {
 			if isWebUI {
-				defer stopCallbackForwarder(kiroCallbackPort)
+				defer stopCallbackForwarderInstance(kiroCallbackPort, forwarder)
 			}
 
 			socialClient := kiroauth.NewSocialAuthClient(h.cfg)
@@ -2904,7 +2943,7 @@ func (h *Handler) RequestKiloToken(c *gin.Context) {
 			Metadata: map[string]any{
 				"email":           status.UserEmail,
 				"organization_id": orgID,
-				"model":          defaults.Model,
+				"model":           defaults.Model,
 			},
 		}
 

internal/api/handlers/management/auth_files_delete_test.go

@@ -0,0 +1,129 @@
+package management
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/config"
+	coreauth "github.com/router-for-me/CLIProxyAPI/v6/sdk/cliproxy/auth"
+)
+
+func TestDeleteAuthFile_UsesAuthPathFromManager(t *testing.T) {
+	t.Setenv("MANAGEMENT_PASSWORD", "")
+	gin.SetMode(gin.TestMode)
+
+	tempDir := t.TempDir()
+	authDir := filepath.Join(tempDir, "auth")
+	externalDir := filepath.Join(tempDir, "external")
+	if errMkdirAuth := os.MkdirAll(authDir, 0o700); errMkdirAuth != nil {
+		t.Fatalf("failed to create auth dir: %v", errMkdirAuth)
+	}
+	if errMkdirExternal := os.MkdirAll(externalDir, 0o700); errMkdirExternal != nil {
+		t.Fatalf("failed to create external dir: %v", errMkdirExternal)
+	}
+
+	fileName := "codex-user@example.com-plus.json"
+	shadowPath := filepath.Join(authDir, fileName)
+	realPath := filepath.Join(externalDir, fileName)
+	if errWriteShadow := os.WriteFile(shadowPath, []byte(`{"type":"codex","email":"shadow@example.com"}`), 0o600); errWriteShadow != nil {
+		t.Fatalf("failed to write shadow file: %v", errWriteShadow)
+	}
+	if errWriteReal := os.WriteFile(realPath, []byte(`{"type":"codex","email":"real@example.com"}`), 0o600); errWriteReal != nil {
+		t.Fatalf("failed to write real file: %v", errWriteReal)
+	}
+
+	manager := coreauth.NewManager(nil, nil, nil)
+	record := &coreauth.Auth{
+		ID:          "legacy/" + fileName,
+		FileName:    fileName,
+		Provider:    "codex",
+		Status:      coreauth.StatusError,
+		Unavailable: true,
+		Attributes: map[string]string{
+			"path": realPath,
+		},
+		Metadata: map[string]any{
+			"type":  "codex",
+			"email": "real@example.com",
+		},
+	}
+	if _, errRegister := manager.Register(context.Background(), record); errRegister != nil {
+		t.Fatalf("failed to register auth record: %v", errRegister)
+	}
+
+	h := NewHandlerWithoutConfigFilePath(&config.Config{AuthDir: authDir}, manager)
+	h.tokenStore = &memoryAuthStore{}
+
+	deleteRec := httptest.NewRecorder()
+	deleteCtx, _ := gin.CreateTestContext(deleteRec)
+	deleteReq := httptest.NewRequest(http.MethodDelete, "/v0/management/auth-files?name="+url.QueryEscape(fileName), nil)
+	deleteCtx.Request = deleteReq
+	h.DeleteAuthFile(deleteCtx)
+
+	if deleteRec.Code != http.StatusOK {
+		t.Fatalf("expected delete status %d, got %d with body %s", http.StatusOK, deleteRec.Code, deleteRec.Body.String())
+	}
+	if _, errStatReal := os.Stat(realPath); !os.IsNotExist(errStatReal) {
+		t.Fatalf("expected managed auth file to be removed, stat err: %v", errStatReal)
+	}
+	if _, errStatShadow := os.Stat(shadowPath); errStatShadow != nil {
+		t.Fatalf("expected shadow auth file to remain, stat err: %v", errStatShadow)
+	}
+
+	listRec := httptest.NewRecorder()
+	listCtx, _ := gin.CreateTestContext(listRec)
+	listReq := httptest.NewRequest(http.MethodGet, "/v0/management/auth-files", nil)
+	listCtx.Request = listReq
+	h.ListAuthFiles(listCtx)
+
+	if listRec.Code != http.StatusOK {
+		t.Fatalf("expected list status %d, got %d with body %s", http.StatusOK, listRec.Code, listRec.Body.String())
+	}
+	var listPayload map[string]any
+	if errUnmarshal := json.Unmarshal(listRec.Body.Bytes(), &listPayload); errUnmarshal != nil {
+		t.Fatalf("failed to decode list payload: %v", errUnmarshal)
+	}
+	filesRaw, ok := listPayload["files"].([]any)
+	if !ok {
+		t.Fatalf("expected files array, payload: %#v", listPayload)
+	}
+	if len(filesRaw) != 0 {
+		t.Fatalf("expected removed auth to be hidden from list, got %d entries", len(filesRaw))
+	}
+}
+
+func TestDeleteAuthFile_FallbackToAuthDirPath(t *testing.T) {
+	t.Setenv("MANAGEMENT_PASSWORD", "")
+	gin.SetMode(gin.TestMode)
+
+	authDir := t.TempDir()
+	fileName := "fallback-user.json"
+	filePath := filepath.Join(authDir, fileName)
+	if errWrite := os.WriteFile(filePath, []byte(`{"type":"codex"}`), 0o600); errWrite != nil {
+		t.Fatalf("failed to write auth file: %v", errWrite)
+	}
+
+	manager := coreauth.NewManager(nil, nil, nil)
+	h := NewHandlerWithoutConfigFilePath(&config.Config{AuthDir: authDir}, manager)
+	h.tokenStore = &memoryAuthStore{}
+
+	deleteRec := httptest.NewRecorder()
+	deleteCtx, _ := gin.CreateTestContext(deleteRec)
+	deleteReq := httptest.NewRequest(http.MethodDelete, "/v0/management/auth-files?name="+url.QueryEscape(fileName), nil)
+	deleteCtx.Request = deleteReq
+	h.DeleteAuthFile(deleteCtx)
+
+	if deleteRec.Code != http.StatusOK {
+		t.Fatalf("expected delete status %d, got %d with body %s", http.StatusOK, deleteRec.Code, deleteRec.Body.String())
+	}
+	if _, errStat := os.Stat(filePath); !os.IsNotExist(errStat) {
+		t.Fatalf("expected auth file to be removed from auth dir, stat err: %v", errStat)
+	}
+}

internal/config/oauth_model_alias_defaults.go

@@ -0,0 +1,37 @@
+package config
+
+// defaultKiroAliases returns default oauth-model-alias entries for Kiro.
+// These aliases expose standard Claude IDs for Kiro-prefixed upstream models.
+func defaultKiroAliases() []OAuthModelAlias {
+	return []OAuthModelAlias{
+		// Sonnet 4.6
+		{Name: "kiro-claude-sonnet-4-6", Alias: "claude-sonnet-4-6", Fork: true},
+		// Sonnet 4.5
+		{Name: "kiro-claude-sonnet-4-5", Alias: "claude-sonnet-4-5-20250929", Fork: true},
+		{Name: "kiro-claude-sonnet-4-5", Alias: "claude-sonnet-4-5", Fork: true},
+		// Sonnet 4
+		{Name: "kiro-claude-sonnet-4", Alias: "claude-sonnet-4-20250514", Fork: true},
+		{Name: "kiro-claude-sonnet-4", Alias: "claude-sonnet-4", Fork: true},
+		// Opus 4.6
+		{Name: "kiro-claude-opus-4-6", Alias: "claude-opus-4-6", Fork: true},
+		// Opus 4.5
+		{Name: "kiro-claude-opus-4-5", Alias: "claude-opus-4-5-20251101", Fork: true},
+		{Name: "kiro-claude-opus-4-5", Alias: "claude-opus-4-5", Fork: true},
+		// Haiku 4.5
+		{Name: "kiro-claude-haiku-4-5", Alias: "claude-haiku-4-5-20251001", Fork: true},
+		{Name: "kiro-claude-haiku-4-5", Alias: "claude-haiku-4-5", Fork: true},
+	}
+}
+
+// defaultGitHubCopilotAliases returns default oauth-model-alias entries for
+// GitHub Copilot Claude models. It exposes hyphen-style IDs used by clients.
+func defaultGitHubCopilotAliases() []OAuthModelAlias {
+	return []OAuthModelAlias{
+		{Name: "claude-haiku-4.5", Alias: "claude-haiku-4-5", Fork: true},
+		{Name: "claude-opus-4.1", Alias: "claude-opus-4-1", Fork: true},
+		{Name: "claude-opus-4.5", Alias: "claude-opus-4-5", Fork: true},
+		{Name: "claude-opus-4.6", Alias: "claude-opus-4-6", Fork: true},
+		{Name: "claude-sonnet-4.5", Alias: "claude-sonnet-4-5", Fork: true},
+		{Name: "claude-sonnet-4.6", Alias: "claude-sonnet-4-6", Fork: true},
+	}
+}

internal/registry/model_definitions_static_data.go

@@ -37,7 +37,7 @@ func GetClaudeModels() []*ModelInfo {
 			DisplayName:         "Claude 4.6 Sonnet",
 			ContextLength:       200000,
 			MaxCompletionTokens: 64000,
-			Thinking:            &ThinkingSupport{Min: 1024, Max: 128000, ZeroAllowed: true, DynamicAllowed: false},
+			Thinking:            &ThinkingSupport{Min: 1024, Max: 128000, ZeroAllowed: true, DynamicAllowed: false, Levels: []string{"low", "medium", "high"}},
 		},
 		{
 			ID:                  "claude-opus-4-6",
@@ -49,7 +49,7 @@ func GetClaudeModels() []*ModelInfo {
 			Description:         "Premium model combining maximum intelligence with practical performance",
 			ContextLength:       1000000,
 			MaxCompletionTokens: 128000,
-			Thinking:            &ThinkingSupport{Min: 1024, Max: 128000, ZeroAllowed: true, DynamicAllowed: false},
+			Thinking:            &ThinkingSupport{Min: 1024, Max: 128000, ZeroAllowed: true, DynamicAllowed: false, Levels: []string{"low", "medium", "high", "max"}},
 		},
 		{
 			ID:                  "claude-sonnet-4-6",

internal/registry/model_registry.go

@@ -47,6 +47,8 @@ type ModelInfo struct {
 	MaxCompletionTokens int `json:"max_completion_tokens,omitempty"`
 	// SupportedParameters lists supported parameters
 	SupportedParameters []string `json:"supported_parameters,omitempty"`
+	// SupportedEndpoints lists supported API endpoints (e.g., "/chat/completions", "/responses").
+	SupportedEndpoints []string `json:"supported_endpoints,omitempty"`
 	// SupportedInputModalities lists supported input modalities (e.g., TEXT, IMAGE, VIDEO, AUDIO)
 	SupportedInputModalities []string `json:"supportedInputModalities,omitempty"`
 	// SupportedOutputModalities lists supported output modalities (e.g., TEXT, IMAGE)

internal/runtime/executor/claude_executor.go

@@ -634,6 +634,12 @@ func disableThinkingIfToolChoiceForced(body []byte) []byte {
 	if toolChoiceType == "any" || toolChoiceType == "tool" {
 		// Remove thinking configuration entirely to avoid API error
 		body, _ = sjson.DeleteBytes(body, "thinking")
+		// Adaptive thinking may also set output_config.effort; remove it to avoid
+		// leaking thinking controls when tool_choice forces tool use.
+		body, _ = sjson.DeleteBytes(body, "output_config.effort")
+		if oc := gjson.GetBytes(body, "output_config"); oc.Exists() && oc.IsObject() && len(oc.Map()) == 0 {
+			body, _ = sjson.DeleteBytes(body, "output_config")
+		}
 	}
 	return body
 }

internal/thinking/apply.go

@@ -293,7 +293,7 @@ func normalizeUserDefinedConfig(config ThinkingConfig, fromFormat, toFormat stri
 	if config.Mode != ModeLevel {
 		return config
 	}
-	if !isBudgetBasedProvider(toFormat) || !isLevelBasedProvider(fromFormat) {
+	if !isBudgetCapableProvider(toFormat) {
 		return config
 	}
 	budget, ok := ConvertLevelToBudget(string(config.Level))
@@ -353,6 +353,26 @@ func extractClaudeConfig(body []byte) ThinkingConfig {
 	if thinkingType == "disabled" {
 		return ThinkingConfig{Mode: ModeNone, Budget: 0}
 	}
+	if thinkingType == "adaptive" || thinkingType == "auto" {
+		// Claude adaptive thinking uses output_config.effort (low/medium/high/max).
+		// We only treat it as a thinking config when effort is explicitly present;
+		// otherwise we passthrough and let upstream defaults apply.
+		if effort := gjson.GetBytes(body, "output_config.effort"); effort.Exists() && effort.Type == gjson.String {
+			value := strings.ToLower(strings.TrimSpace(effort.String()))
+			if value == "" {
+				return ThinkingConfig{}
+			}
+			switch value {
+			case "none":
+				return ThinkingConfig{Mode: ModeNone, Budget: 0}
+			case "auto":
+				return ThinkingConfig{Mode: ModeAuto, Budget: -1}
+			default:
+				return ThinkingConfig{Mode: ModeLevel, Level: ThinkingLevel(value)}
+			}
+		}
+		return ThinkingConfig{}
+	}
 
 	// Check budget_tokens
 	if budget := gjson.GetBytes(body, "thinking.budget_tokens"); budget.Exists() {

internal/thinking/convert.go

@@ -16,6 +16,9 @@ var levelToBudgetMap = map[string]int{
 	"medium":  8192,
 	"high":    24576,
 	"xhigh":   32768,
+	// "max" is used by Claude adaptive thinking effort. We map it to a large budget
+	// and rely on per-model clamping when converting to budget-only providers.
+	"max": 128000,
 }
 
 // ConvertLevelToBudget converts a thinking level to a budget value.
@@ -31,6 +34,7 @@ var levelToBudgetMap = map[string]int{
 //   - medium  → 8192
 //   - high    → 24576
 //   - xhigh   → 32768
+//   - max     → 128000
 //
 // Returns:
 //   - budget: The converted budget value
@@ -92,6 +96,43 @@ func ConvertBudgetToLevel(budget int) (string, bool) {
 	}
 }
 
+// HasLevel reports whether the given target level exists in the levels slice.
+// Matching is case-insensitive with leading/trailing whitespace trimmed.
+func HasLevel(levels []string, target string) bool {
+	for _, level := range levels {
+		if strings.EqualFold(strings.TrimSpace(level), target) {
+			return true
+		}
+	}
+	return false
+}
+
+// MapToClaudeEffort maps a generic thinking level string to a Claude adaptive
+// thinking effort value (low/medium/high/max).
+//
+// supportsMax indicates whether the target model supports "max" effort.
+// Returns the mapped effort and true if the level is valid, or ("", false) otherwise.
+func MapToClaudeEffort(level string, supportsMax bool) (string, bool) {
+	level = strings.ToLower(strings.TrimSpace(level))
+	switch level {
+	case "":
+		return "", false
+	case "minimal":
+		return "low", true
+	case "low", "medium", "high":
+		return level, true
+	case "xhigh", "max":
+		if supportsMax {
+			return "max", true
+		}
+		return "high", true
+	case "auto":
+		return "high", true
+	default:
+		return "", false
+	}
+}
+
 // ModelCapability describes the thinking format support of a model.
 type ModelCapability int
 

internal/thinking/provider/claude/apply.go

@@ -1,8 +1,10 @@
 // Package claude implements thinking configuration scaffolding for Claude models.
 //
-// Claude models use the thinking.budget_tokens format with values in the range
-// 1024-128000. Some Claude models support ZeroAllowed (sonnet-4-5, opus-4-5),
-// while older models do not.
+// Claude models support two thinking control styles:
+//   - Manual thinking: thinking.type="enabled" with thinking.budget_tokens (token budget)
+//   - Adaptive thinking (Claude 4.6): thinking.type="adaptive" with output_config.effort (low/medium/high/max)
+//
+// Some Claude models support ZeroAllowed (sonnet-4-5, opus-4-5), while older models do not.
 // See: _bmad-output/planning-artifacts/architecture.md#Epic-6
 package claude
 
@@ -34,7 +36,11 @@ func init() {
 //   - Budget clamping to model range
 //   - ZeroAllowed constraint enforcement
 //
-// Apply only processes ModeBudget and ModeNone; other modes are passed through unchanged.
+// Apply processes:
+//   - ModeBudget: manual thinking budget_tokens
+//   - ModeLevel: adaptive thinking effort (Claude 4.6)
+//   - ModeAuto: provider default adaptive/manual behavior
+//   - ModeNone: disabled
 //
 // Expected output format when enabled:
 //
@@ -45,6 +51,17 @@ func init() {
 //	  }
 //	}
 //
+// Expected output format for adaptive:
+//
+//	{
+//	  "thinking": {
+//	    "type": "adaptive"
+//	  },
+//	  "output_config": {
+//	    "effort": "high"
+//	  }
+//	}
+//
 // Expected output format when disabled:
 //
 //	{
@@ -60,30 +77,91 @@ func (a *Applier) Apply(body []byte, config thinking.ThinkingConfig, modelInfo *
 		return body, nil
 	}
 
-	// Only process ModeBudget and ModeNone; other modes pass through
-	// (caller should use ValidateConfig first to normalize modes)
-	if config.Mode != thinking.ModeBudget && config.Mode != thinking.ModeNone {
-		return body, nil
-	}
-
 	if len(body) == 0 || !gjson.ValidBytes(body) {
 		body = []byte(`{}`)
 	}
 
-	// Budget is expected to be pre-validated by ValidateConfig (clamped, ZeroAllowed enforced)
-	// Decide enabled/disabled based on budget value
-	if config.Budget == 0 {
+	supportsAdaptive := modelInfo != nil && modelInfo.Thinking != nil && len(modelInfo.Thinking.Levels) > 0
+
+	switch config.Mode {
+	case thinking.ModeNone:
 		result, _ := sjson.SetBytes(body, "thinking.type", "disabled")
 		result, _ = sjson.DeleteBytes(result, "thinking.budget_tokens")
+		result, _ = sjson.DeleteBytes(result, "output_config.effort")
+		if oc := gjson.GetBytes(result, "output_config"); oc.Exists() && oc.IsObject() && len(oc.Map()) == 0 {
+			result, _ = sjson.DeleteBytes(result, "output_config")
+		}
 		return result, nil
+
+	case thinking.ModeLevel:
+		// Adaptive thinking effort is only valid when the model advertises discrete levels.
+		// (Claude 4.6 uses output_config.effort.)
+		if supportsAdaptive && config.Level != "" {
+			result, _ := sjson.SetBytes(body, "thinking.type", "adaptive")
+			result, _ = sjson.DeleteBytes(result, "thinking.budget_tokens")
+			result, _ = sjson.SetBytes(result, "output_config.effort", string(config.Level))
+			return result, nil
+		}
+
+		// Fallback for non-adaptive Claude models: convert level to budget_tokens.
+		if budget, ok := thinking.ConvertLevelToBudget(string(config.Level)); ok {
+			config.Mode = thinking.ModeBudget
+			config.Budget = budget
+			config.Level = ""
+		} else {
+			return body, nil
+		}
+		fallthrough
+
+	case thinking.ModeBudget:
+		// Budget is expected to be pre-validated by ValidateConfig (clamped, ZeroAllowed enforced).
+		// Decide enabled/disabled based on budget value.
+		if config.Budget == 0 {
+			result, _ := sjson.SetBytes(body, "thinking.type", "disabled")
+			result, _ = sjson.DeleteBytes(result, "thinking.budget_tokens")
+			result, _ = sjson.DeleteBytes(result, "output_config.effort")
+			if oc := gjson.GetBytes(result, "output_config"); oc.Exists() && oc.IsObject() && len(oc.Map()) == 0 {
+				result, _ = sjson.DeleteBytes(result, "output_config")
+			}
+			return result, nil
+		}
+
+		result, _ := sjson.SetBytes(body, "thinking.type", "enabled")
+		result, _ = sjson.SetBytes(result, "thinking.budget_tokens", config.Budget)
+		result, _ = sjson.DeleteBytes(result, "output_config.effort")
+		if oc := gjson.GetBytes(result, "output_config"); oc.Exists() && oc.IsObject() && len(oc.Map()) == 0 {
+			result, _ = sjson.DeleteBytes(result, "output_config")
+		}
+
+		// Ensure max_tokens > thinking.budget_tokens (Anthropic API constraint).
+		result = a.normalizeClaudeBudget(result, config.Budget, modelInfo)
+		return result, nil
+
+	case thinking.ModeAuto:
+		// For Claude 4.6 models, auto maps to adaptive thinking with upstream defaults.
+		if supportsAdaptive {
+			result, _ := sjson.SetBytes(body, "thinking.type", "adaptive")
+			result, _ = sjson.DeleteBytes(result, "thinking.budget_tokens")
+			// Explicit effort is optional for adaptive thinking; omit it to allow upstream default.
+			result, _ = sjson.DeleteBytes(result, "output_config.effort")
+			if oc := gjson.GetBytes(result, "output_config"); oc.Exists() && oc.IsObject() && len(oc.Map()) == 0 {
+				result, _ = sjson.DeleteBytes(result, "output_config")
+			}
+			return result, nil
+		}
+
+		// Legacy fallback: enable thinking without specifying budget_tokens.
+		result, _ := sjson.SetBytes(body, "thinking.type", "enabled")
+		result, _ = sjson.DeleteBytes(result, "thinking.budget_tokens")
+		result, _ = sjson.DeleteBytes(result, "output_config.effort")
+		if oc := gjson.GetBytes(result, "output_config"); oc.Exists() && oc.IsObject() && len(oc.Map()) == 0 {
+			result, _ = sjson.DeleteBytes(result, "output_config")
+		}
+		return result, nil
+
+	default:
+		return body, nil
 	}
-
-	result, _ := sjson.SetBytes(body, "thinking.type", "enabled")
-	result, _ = sjson.SetBytes(result, "thinking.budget_tokens", config.Budget)
-
-	// Ensure max_tokens > thinking.budget_tokens (Anthropic API constraint)
-	result = a.normalizeClaudeBudget(result, config.Budget, modelInfo)
-	return result, nil
 }
 
 // normalizeClaudeBudget applies Claude-specific constraints to ensure max_tokens > budget_tokens.
@@ -141,7 +219,7 @@ func (a *Applier) effectiveMaxTokens(body []byte, modelInfo *registry.ModelInfo)
 }
 
 func applyCompatibleClaude(body []byte, config thinking.ThinkingConfig) ([]byte, error) {
-	if config.Mode != thinking.ModeBudget && config.Mode != thinking.ModeNone && config.Mode != thinking.ModeAuto {
+	if config.Mode != thinking.ModeBudget && config.Mode != thinking.ModeNone && config.Mode != thinking.ModeAuto && config.Mode != thinking.ModeLevel {
 		return body, nil
 	}
 
@@ -153,14 +231,36 @@ func applyCompatibleClaude(body []byte, config thinking.ThinkingConfig) ([]byte,
 	case thinking.ModeNone:
 		result, _ := sjson.SetBytes(body, "thinking.type", "disabled")
 		result, _ = sjson.DeleteBytes(result, "thinking.budget_tokens")
+		result, _ = sjson.DeleteBytes(result, "output_config.effort")
+		if oc := gjson.GetBytes(result, "output_config"); oc.Exists() && oc.IsObject() && len(oc.Map()) == 0 {
+			result, _ = sjson.DeleteBytes(result, "output_config")
+		}
 		return result, nil
 	case thinking.ModeAuto:
 		result, _ := sjson.SetBytes(body, "thinking.type", "enabled")
 		result, _ = sjson.DeleteBytes(result, "thinking.budget_tokens")
+		result, _ = sjson.DeleteBytes(result, "output_config.effort")
+		if oc := gjson.GetBytes(result, "output_config"); oc.Exists() && oc.IsObject() && len(oc.Map()) == 0 {
+			result, _ = sjson.DeleteBytes(result, "output_config")
+		}
+		return result, nil
+	case thinking.ModeLevel:
+		// For user-defined models, interpret ModeLevel as Claude adaptive thinking effort.
+		// Upstream is responsible for validating whether the target model supports it.
+		if config.Level == "" {
+			return body, nil
+		}
+		result, _ := sjson.SetBytes(body, "thinking.type", "adaptive")
+		result, _ = sjson.DeleteBytes(result, "thinking.budget_tokens")
+		result, _ = sjson.SetBytes(result, "output_config.effort", string(config.Level))
 		return result, nil
 	default:
 		result, _ := sjson.SetBytes(body, "thinking.type", "enabled")
 		result, _ = sjson.SetBytes(result, "thinking.budget_tokens", config.Budget)
+		result, _ = sjson.DeleteBytes(result, "output_config.effort")
+		if oc := gjson.GetBytes(result, "output_config"); oc.Exists() && oc.IsObject() && len(oc.Map()) == 0 {
+			result, _ = sjson.DeleteBytes(result, "output_config")
+		}
 		return result, nil
 	}
 }

internal/thinking/provider/codex/apply.go

@@ -7,8 +7,6 @@
 package codex
 
 import (
-	"strings"
-
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/registry"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/thinking"
 	"github.com/tidwall/gjson"
@@ -68,7 +66,7 @@ func (a *Applier) Apply(body []byte, config thinking.ThinkingConfig, modelInfo *
 	effort := ""
 	support := modelInfo.Thinking
 	if config.Budget == 0 {
-		if support.ZeroAllowed || hasLevel(support.Levels, string(thinking.LevelNone)) {
+		if support.ZeroAllowed || thinking.HasLevel(support.Levels, string(thinking.LevelNone)) {
 			effort = string(thinking.LevelNone)
 		}
 	}
@@ -120,12 +118,3 @@ func applyCompatibleCodex(body []byte, config thinking.ThinkingConfig) ([]byte,
 	result, _ := sjson.SetBytes(body, "reasoning.effort", effort)
 	return result, nil
 }
-
-func hasLevel(levels []string, target string) bool {
-	for _, level := range levels {
-		if strings.EqualFold(strings.TrimSpace(level), target) {
-			return true
-		}
-	}
-	return false
-}

internal/thinking/provider/openai/apply.go

@@ -6,8 +6,6 @@
 package openai
 
 import (
-	"strings"
-
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/registry"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/thinking"
 	"github.com/tidwall/gjson"
@@ -65,7 +63,7 @@ func (a *Applier) Apply(body []byte, config thinking.ThinkingConfig, modelInfo *
 	effort := ""
 	support := modelInfo.Thinking
 	if config.Budget == 0 {
-		if support.ZeroAllowed || hasLevel(support.Levels, string(thinking.LevelNone)) {
+		if support.ZeroAllowed || thinking.HasLevel(support.Levels, string(thinking.LevelNone)) {
 			effort = string(thinking.LevelNone)
 		}
 	}
@@ -117,12 +115,3 @@ func applyCompatibleOpenAI(body []byte, config thinking.ThinkingConfig) ([]byte,
 	result, _ := sjson.SetBytes(body, "reasoning_effort", effort)
 	return result, nil
 }
-
-func hasLevel(levels []string, target string) bool {
-	for _, level := range levels {
-		if strings.EqualFold(strings.TrimSpace(level), target) {
-			return true
-		}
-	}
-	return false
-}

internal/thinking/strip.go

@@ -30,7 +30,7 @@ func StripThinkingConfig(body []byte, provider string) []byte {
 	var paths []string
 	switch provider {
 	case "claude":
-		paths = []string{"thinking"}
+		paths = []string{"thinking", "output_config.effort"}
 	case "gemini":
 		paths = []string{"generationConfig.thinkingConfig"}
 	case "gemini-cli", "antigravity":
@@ -59,5 +59,12 @@ func StripThinkingConfig(body []byte, provider string) []byte {
 	for _, path := range paths {
 		result, _ = sjson.DeleteBytes(result, path)
 	}
+
+	// Avoid leaving an empty output_config object for Claude when effort was the only field.
+	if provider == "claude" {
+		if oc := gjson.GetBytes(result, "output_config"); oc.Exists() && oc.IsObject() && len(oc.Map()) == 0 {
+			result, _ = sjson.DeleteBytes(result, "output_config")
+		}
+	}
 	return result
 }

internal/thinking/suffix.go

@@ -109,7 +109,7 @@ func ParseSpecialSuffix(rawSuffix string) (mode ThinkingMode, ok bool) {
 // ParseLevelSuffix attempts to parse a raw suffix as a discrete thinking level.
 //
 // This function parses the raw suffix content (from ParseSuffix.RawSuffix) as a level.
-// Only discrete effort levels are valid: minimal, low, medium, high, xhigh.
+// Only discrete effort levels are valid: minimal, low, medium, high, xhigh, max.
 // Level matching is case-insensitive.
 //
 // Special values (none, auto) are NOT handled by this function; use ParseSpecialSuffix
@@ -140,6 +140,8 @@ func ParseLevelSuffix(rawSuffix string) (level ThinkingLevel, ok bool) {
 		return LevelHigh, true
 	case "xhigh":
 		return LevelXHigh, true
+	case "max":
+		return LevelMax, true
 	default:
 		return "", false
 	}

internal/thinking/types.go

@@ -54,6 +54,9 @@ const (
 	LevelHigh ThinkingLevel = "high"
 	// LevelXHigh sets extra-high thinking effort
 	LevelXHigh ThinkingLevel = "xhigh"
+	// LevelMax sets maximum thinking effort.
+	// This is currently used by Claude 4.6 adaptive thinking (opus supports "max").
+	LevelMax ThinkingLevel = "max"
 )
 
 // ThinkingConfig represents a unified thinking configuration.

internal/thinking/validate.go

@@ -53,7 +53,17 @@ func ValidateConfig(config ThinkingConfig, modelInfo *registry.ModelInfo, fromFo
 		return &config, nil
 	}
 
-	allowClampUnsupported := isBudgetBasedProvider(fromFormat) && isLevelBasedProvider(toFormat)
+	// allowClampUnsupported determines whether to clamp unsupported levels instead of returning an error.
+	// This applies when crossing provider families (e.g., openai→gemini, claude→gemini) and the target
+	// model supports discrete levels. Same-family conversions require strict validation.
+	toCapability := detectModelCapability(modelInfo)
+	toHasLevelSupport := toCapability == CapabilityLevelOnly || toCapability == CapabilityHybrid
+	allowClampUnsupported := toHasLevelSupport && !isSameProviderFamily(fromFormat, toFormat)
+
+	// strictBudget determines whether to enforce strict budget range validation.
+	// This applies when: (1) config comes from request body (not suffix), (2) source format is known,
+	// and (3) source and target are in the same provider family. Cross-family or suffix-based configs
+	// are clamped instead of rejected to improve interoperability.
 	strictBudget := !fromSuffix && fromFormat != "" && isSameProviderFamily(fromFormat, toFormat)
 	budgetDerivedFromLevel := false
 
@@ -201,7 +211,7 @@ func convertAutoToMidRange(config ThinkingConfig, support *registry.ThinkingSupp
 }
 
 // standardLevelOrder defines the canonical ordering of thinking levels from lowest to highest.
-var standardLevelOrder = []ThinkingLevel{LevelMinimal, LevelLow, LevelMedium, LevelHigh, LevelXHigh}
+var standardLevelOrder = []ThinkingLevel{LevelMinimal, LevelLow, LevelMedium, LevelHigh, LevelXHigh, LevelMax}
 
 // clampLevel clamps the given level to the nearest supported level.
 // On tie, prefers the lower level.
@@ -325,7 +335,9 @@ func normalizeLevels(levels []string) []string {
 	return out
 }
 
-func isBudgetBasedProvider(provider string) bool {
+// isBudgetCapableProvider returns true if the provider supports budget-based thinking.
+// These providers may also support level-based thinking (hybrid models).
+func isBudgetCapableProvider(provider string) bool {
 	switch provider {
 	case "gemini", "gemini-cli", "antigravity", "claude":
 		return true
@@ -334,15 +346,6 @@ func isBudgetBasedProvider(provider string) bool {
 	}
 }
 
-func isLevelBasedProvider(provider string) bool {
-	switch provider {
-	case "openai", "openai-response", "codex":
-		return true
-	default:
-		return false
-	}
-}
-
 func isGeminiFamily(provider string) bool {
 	switch provider {
 	case "gemini", "gemini-cli", "antigravity":
@@ -352,11 +355,21 @@ func isGeminiFamily(provider string) bool {
 	}
 }
 
+func isOpenAIFamily(provider string) bool {
+	switch provider {
+	case "openai", "openai-response", "codex":
+		return true
+	default:
+		return false
+	}
+}
+
 func isSameProviderFamily(from, to string) bool {
 	if from == to {
 		return true
 	}
-	return isGeminiFamily(from) && isGeminiFamily(to)
+	return (isGeminiFamily(from) && isGeminiFamily(to)) ||
+		(isOpenAIFamily(from) && isOpenAIFamily(to))
 }
 
 func abs(x int) int {

internal/translator/claude/gemini/claude_gemini_request.go

@@ -14,6 +14,7 @@ import (
 	"strings"
 
 	"github.com/google/uuid"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/registry"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/thinking"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
 	"github.com/tidwall/gjson"
@@ -115,24 +116,47 @@ func ConvertGeminiRequestToClaude(modelName string, inputRawJSON []byte, stream
 		// Include thoughts configuration for reasoning process visibility
 		// Translator only does format conversion, ApplyThinking handles model capability validation.
 		if thinkingConfig := genConfig.Get("thinkingConfig"); thinkingConfig.Exists() && thinkingConfig.IsObject() {
+			mi := registry.LookupModelInfo(modelName, "claude")
+			supportsAdaptive := mi != nil && mi.Thinking != nil && len(mi.Thinking.Levels) > 0
+			supportsMax := supportsAdaptive && thinking.HasLevel(mi.Thinking.Levels, string(thinking.LevelMax))
+
+			// MapToClaudeEffort normalizes levels (e.g. minimal→low, xhigh→high) to avoid
+			// validation errors since validate treats same-provider unsupported levels as errors.
 			thinkingLevel := thinkingConfig.Get("thinkingLevel")
 			if !thinkingLevel.Exists() {
 				thinkingLevel = thinkingConfig.Get("thinking_level")
 			}
 			if thinkingLevel.Exists() {
 				level := strings.ToLower(strings.TrimSpace(thinkingLevel.String()))
-				switch level {
-				case "":
-				case "none":
-					out, _ = sjson.Set(out, "thinking.type", "disabled")
-					out, _ = sjson.Delete(out, "thinking.budget_tokens")
-				case "auto":
-					out, _ = sjson.Set(out, "thinking.type", "enabled")
-					out, _ = sjson.Delete(out, "thinking.budget_tokens")
-				default:
-					if budget, ok := thinking.ConvertLevelToBudget(level); ok {
+				if supportsAdaptive {
+					switch level {
+					case "":
+					case "none":
+						out, _ = sjson.Set(out, "thinking.type", "disabled")
+						out, _ = sjson.Delete(out, "thinking.budget_tokens")
+						out, _ = sjson.Delete(out, "output_config.effort")
+					default:
+						if mapped, ok := thinking.MapToClaudeEffort(level, supportsMax); ok {
+							level = mapped
+						}
+						out, _ = sjson.Set(out, "thinking.type", "adaptive")
+						out, _ = sjson.Delete(out, "thinking.budget_tokens")
+						out, _ = sjson.Set(out, "output_config.effort", level)
+					}
+				} else {
+					switch level {
+					case "":
+					case "none":
+						out, _ = sjson.Set(out, "thinking.type", "disabled")
+						out, _ = sjson.Delete(out, "thinking.budget_tokens")
+					case "auto":
 						out, _ = sjson.Set(out, "thinking.type", "enabled")
-						out, _ = sjson.Set(out, "thinking.budget_tokens", budget)
+						out, _ = sjson.Delete(out, "thinking.budget_tokens")
+					default:
+						if budget, ok := thinking.ConvertLevelToBudget(level); ok {
+							out, _ = sjson.Set(out, "thinking.type", "enabled")
+							out, _ = sjson.Set(out, "thinking.budget_tokens", budget)
+						}
 					}
 				}
 			} else {
@@ -142,16 +166,35 @@ func ConvertGeminiRequestToClaude(modelName string, inputRawJSON []byte, stream
 				}
 				if thinkingBudget.Exists() {
 					budget := int(thinkingBudget.Int())
-					switch budget {
-					case 0:
-						out, _ = sjson.Set(out, "thinking.type", "disabled")
-						out, _ = sjson.Delete(out, "thinking.budget_tokens")
-					case -1:
-						out, _ = sjson.Set(out, "thinking.type", "enabled")
-						out, _ = sjson.Delete(out, "thinking.budget_tokens")
-					default:
-						out, _ = sjson.Set(out, "thinking.type", "enabled")
-						out, _ = sjson.Set(out, "thinking.budget_tokens", budget)
+					if supportsAdaptive {
+						switch budget {
+						case 0:
+							out, _ = sjson.Set(out, "thinking.type", "disabled")
+							out, _ = sjson.Delete(out, "thinking.budget_tokens")
+							out, _ = sjson.Delete(out, "output_config.effort")
+						default:
+							level, ok := thinking.ConvertBudgetToLevel(budget)
+							if ok {
+								if mapped, okM := thinking.MapToClaudeEffort(level, supportsMax); okM {
+									level = mapped
+								}
+								out, _ = sjson.Set(out, "thinking.type", "adaptive")
+								out, _ = sjson.Delete(out, "thinking.budget_tokens")
+								out, _ = sjson.Set(out, "output_config.effort", level)
+							}
+						}
+					} else {
+						switch budget {
+						case 0:
+							out, _ = sjson.Set(out, "thinking.type", "disabled")
+							out, _ = sjson.Delete(out, "thinking.budget_tokens")
+						case -1:
+							out, _ = sjson.Set(out, "thinking.type", "enabled")
+							out, _ = sjson.Delete(out, "thinking.budget_tokens")
+						default:
+							out, _ = sjson.Set(out, "thinking.type", "enabled")
+							out, _ = sjson.Set(out, "thinking.budget_tokens", budget)
+						}
 					}
 				} else if includeThoughts := thinkingConfig.Get("includeThoughts"); includeThoughts.Exists() && includeThoughts.Type == gjson.True {
 					out, _ = sjson.Set(out, "thinking.type", "enabled")

internal/translator/claude/openai/chat-completions/claude_openai_request.go

@@ -14,6 +14,7 @@ import (
 	"strings"
 
 	"github.com/google/uuid"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/registry"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/thinking"
 	"github.com/tidwall/gjson"
 	"github.com/tidwall/sjson"
@@ -68,17 +69,45 @@ func ConvertOpenAIRequestToClaude(modelName string, inputRawJSON []byte, stream
 	if v := root.Get("reasoning_effort"); v.Exists() {
 		effort := strings.ToLower(strings.TrimSpace(v.String()))
 		if effort != "" {
-			budget, ok := thinking.ConvertLevelToBudget(effort)
-			if ok {
-				switch budget {
-				case 0:
+			mi := registry.LookupModelInfo(modelName, "claude")
+			supportsAdaptive := mi != nil && mi.Thinking != nil && len(mi.Thinking.Levels) > 0
+			supportsMax := supportsAdaptive && thinking.HasLevel(mi.Thinking.Levels, string(thinking.LevelMax))
+
+			// Claude 4.6 supports adaptive thinking with output_config.effort.
+			// MapToClaudeEffort normalizes levels (e.g. minimal→low, xhigh→high) to avoid
+			// validation errors since validate treats same-provider unsupported levels as errors.
+			if supportsAdaptive {
+				switch effort {
+				case "none":
 					out, _ = sjson.Set(out, "thinking.type", "disabled")
-				case -1:
-					out, _ = sjson.Set(out, "thinking.type", "enabled")
+					out, _ = sjson.Delete(out, "thinking.budget_tokens")
+					out, _ = sjson.Delete(out, "output_config.effort")
+				case "auto":
+					out, _ = sjson.Set(out, "thinking.type", "adaptive")
+					out, _ = sjson.Delete(out, "thinking.budget_tokens")
+					out, _ = sjson.Delete(out, "output_config.effort")
 				default:
-					if budget > 0 {
+					if mapped, ok := thinking.MapToClaudeEffort(effort, supportsMax); ok {
+						effort = mapped
+					}
+					out, _ = sjson.Set(out, "thinking.type", "adaptive")
+					out, _ = sjson.Delete(out, "thinking.budget_tokens")
+					out, _ = sjson.Set(out, "output_config.effort", effort)
+				}
+			} else {
+				// Legacy/manual thinking (budget_tokens).
+				budget, ok := thinking.ConvertLevelToBudget(effort)
+				if ok {
+					switch budget {
+					case 0:
+						out, _ = sjson.Set(out, "thinking.type", "disabled")
+					case -1:
 						out, _ = sjson.Set(out, "thinking.type", "enabled")
-						out, _ = sjson.Set(out, "thinking.budget_tokens", budget)
+					default:
+						if budget > 0 {
+							out, _ = sjson.Set(out, "thinking.type", "enabled")
+							out, _ = sjson.Set(out, "thinking.budget_tokens", budget)
+						}
 					}
 				}
 			}

internal/translator/claude/openai/responses/claude_openai-responses_request.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 
 	"github.com/google/uuid"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/registry"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/thinking"
 	"github.com/tidwall/gjson"
 	"github.com/tidwall/sjson"
@@ -56,17 +57,45 @@ func ConvertOpenAIResponsesRequestToClaude(modelName string, inputRawJSON []byte
 	if v := root.Get("reasoning.effort"); v.Exists() {
 		effort := strings.ToLower(strings.TrimSpace(v.String()))
 		if effort != "" {
-			budget, ok := thinking.ConvertLevelToBudget(effort)
-			if ok {
-				switch budget {
-				case 0:
+			mi := registry.LookupModelInfo(modelName, "claude")
+			supportsAdaptive := mi != nil && mi.Thinking != nil && len(mi.Thinking.Levels) > 0
+			supportsMax := supportsAdaptive && thinking.HasLevel(mi.Thinking.Levels, string(thinking.LevelMax))
+
+			// Claude 4.6 supports adaptive thinking with output_config.effort.
+			// MapToClaudeEffort normalizes levels (e.g. minimal→low, xhigh→high) to avoid
+			// validation errors since validate treats same-provider unsupported levels as errors.
+			if supportsAdaptive {
+				switch effort {
+				case "none":
 					out, _ = sjson.Set(out, "thinking.type", "disabled")
-				case -1:
-					out, _ = sjson.Set(out, "thinking.type", "enabled")
+					out, _ = sjson.Delete(out, "thinking.budget_tokens")
+					out, _ = sjson.Delete(out, "output_config.effort")
+				case "auto":
+					out, _ = sjson.Set(out, "thinking.type", "adaptive")
+					out, _ = sjson.Delete(out, "thinking.budget_tokens")
+					out, _ = sjson.Delete(out, "output_config.effort")
 				default:
-					if budget > 0 {
+					if mapped, ok := thinking.MapToClaudeEffort(effort, supportsMax); ok {
+						effort = mapped
+					}
+					out, _ = sjson.Set(out, "thinking.type", "adaptive")
+					out, _ = sjson.Delete(out, "thinking.budget_tokens")
+					out, _ = sjson.Set(out, "output_config.effort", effort)
+				}
+			} else {
+				// Legacy/manual thinking (budget_tokens).
+				budget, ok := thinking.ConvertLevelToBudget(effort)
+				if ok {
+					switch budget {
+					case 0:
+						out, _ = sjson.Set(out, "thinking.type", "disabled")
+					case -1:
 						out, _ = sjson.Set(out, "thinking.type", "enabled")
-						out, _ = sjson.Set(out, "thinking.budget_tokens", budget)
+					default:
+						if budget > 0 {
+							out, _ = sjson.Set(out, "thinking.type", "enabled")
+							out, _ = sjson.Set(out, "thinking.budget_tokens", budget)
+						}
 					}
 				}
 			}

internal/translator/codex/claude/codex_claude_request.go

@@ -160,7 +160,51 @@ func ConvertClaudeRequestToCodex(modelName string, inputRawJSON []byte, _ bool)
 						flushMessage()
 						functionCallOutputMessage := `{"type":"function_call_output"}`
 						functionCallOutputMessage, _ = sjson.Set(functionCallOutputMessage, "call_id", messageContentResult.Get("tool_use_id").String())
-						functionCallOutputMessage, _ = sjson.Set(functionCallOutputMessage, "output", messageContentResult.Get("content").String())
+
+						contentResult := messageContentResult.Get("content")
+						if contentResult.IsArray() {
+							toolResultContentIndex := 0
+							toolResultContent := `[]`
+							contentResults := contentResult.Array()
+							for k := 0; k < len(contentResults); k++ {
+								toolResultContentType := contentResults[k].Get("type").String()
+								if toolResultContentType == "image" {
+									sourceResult := contentResults[k].Get("source")
+									if sourceResult.Exists() {
+										data := sourceResult.Get("data").String()
+										if data == "" {
+											data = sourceResult.Get("base64").String()
+										}
+										if data != "" {
+											mediaType := sourceResult.Get("media_type").String()
+											if mediaType == "" {
+												mediaType = sourceResult.Get("mime_type").String()
+											}
+											if mediaType == "" {
+												mediaType = "application/octet-stream"
+											}
+											dataURL := fmt.Sprintf("data:%s;base64,%s", mediaType, data)
+
+											toolResultContent, _ = sjson.Set(toolResultContent, fmt.Sprintf("%d.type", toolResultContentIndex), "input_image")
+											toolResultContent, _ = sjson.Set(toolResultContent, fmt.Sprintf("%d.image_url", toolResultContentIndex), dataURL)
+											toolResultContentIndex++
+										}
+									}
+								} else if toolResultContentType == "text" {
+									toolResultContent, _ = sjson.Set(toolResultContent, fmt.Sprintf("%d.type", toolResultContentIndex), "input_text")
+									toolResultContent, _ = sjson.Set(toolResultContent, fmt.Sprintf("%d.text", toolResultContentIndex), contentResults[k].Get("text").String())
+									toolResultContentIndex++
+								}
+							}
+							if toolResultContent != `[]` {
+								functionCallOutputMessage, _ = sjson.SetRaw(functionCallOutputMessage, "output", toolResultContent)
+							} else {
+								functionCallOutputMessage, _ = sjson.Set(functionCallOutputMessage, "output", messageContentResult.Get("content").String())
+							}
+						} else {
+							functionCallOutputMessage, _ = sjson.Set(functionCallOutputMessage, "output", messageContentResult.Get("content").String())
+						}
+
 						template, _ = sjson.SetRaw(template, "input.-1", functionCallOutputMessage)
 					}
 				}
@@ -231,9 +275,17 @@ func ConvertClaudeRequestToCodex(modelName string, inputRawJSON []byte, _ bool)
 				}
 			}
 		case "adaptive", "auto":
-			// Claude adaptive/auto means "enable with max capacity"; keep it as highest level
-			// and let ApplyThinking normalize per target model capability.
-			reasoningEffort = string(thinking.LevelXHigh)
+			// Adaptive thinking can carry an explicit effort in output_config.effort (Claude 4.6).
+			// Pass through directly; ApplyThinking handles clamping to target model's levels.
+			effort := ""
+			if v := rootResult.Get("output_config.effort"); v.Exists() && v.Type == gjson.String {
+				effort = strings.ToLower(strings.TrimSpace(v.String()))
+			}
+			if effort != "" {
+				reasoningEffort = effort
+			} else {
+				reasoningEffort = string(thinking.LevelXHigh)
+			}
 		case "disabled":
 			if effort, ok := thinking.ConvertBudgetToLevel(0); ok && effort != "" {
 				reasoningEffort = effort

internal/translator/gemini-cli/claude/gemini-cli_claude_request.go

@@ -171,7 +171,8 @@ func ConvertClaudeRequestToCLI(modelName string, inputRawJSON []byte, _ bool) []
 		}
 	}
 
-	// Map Anthropic thinking -> Gemini thinkingBudget/include_thoughts when type==enabled
+	// Map Anthropic thinking -> Gemini CLI thinkingConfig when enabled
+	// Translator only does format conversion, ApplyThinking handles model capability validation.
 	if t := gjson.GetBytes(rawJSON, "thinking"); t.Exists() && t.IsObject() {
 		switch t.Get("type").String() {
 		case "enabled":
@@ -181,9 +182,19 @@ func ConvertClaudeRequestToCLI(modelName string, inputRawJSON []byte, _ bool) []
 				out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.includeThoughts", true)
 			}
 		case "adaptive", "auto":
-			// Keep adaptive/auto as a high level sentinel; ApplyThinking resolves it
-			// to model-specific max capability.
-			out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.thinkingLevel", "high")
+			// For adaptive thinking:
+			// - If output_config.effort is explicitly present, pass through as thinkingLevel.
+			// - Otherwise, treat it as "enabled with target-model maximum" and emit high.
+			// ApplyThinking handles clamping to target model's supported levels.
+			effort := ""
+			if v := gjson.GetBytes(rawJSON, "output_config.effort"); v.Exists() && v.Type == gjson.String {
+				effort = strings.ToLower(strings.TrimSpace(v.String()))
+			}
+			if effort != "" {
+				out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.thinkingLevel", effort)
+			} else {
+				out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.thinkingLevel", "high")
+			}
 			out, _ = sjson.Set(out, "request.generationConfig.thinkingConfig.includeThoughts", true)
 		}
 	}

internal/translator/gemini/claude/gemini_claude_request.go

@@ -9,6 +9,7 @@ import (
 	"bytes"
 	"strings"
 
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/registry"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/translator/gemini/common"
 	"github.com/tidwall/gjson"
 	"github.com/tidwall/sjson"
@@ -151,7 +152,7 @@ func ConvertClaudeRequestToGemini(modelName string, inputRawJSON []byte, _ bool)
 		}
 	}
 
-	// Map Anthropic thinking -> Gemini thinkingBudget/include_thoughts when enabled
+	// Map Anthropic thinking -> Gemini thinking config when enabled
 	// Translator only does format conversion, ApplyThinking handles model capability validation.
 	if t := gjson.GetBytes(rawJSON, "thinking"); t.Exists() && t.IsObject() {
 		switch t.Get("type").String() {
@@ -162,9 +163,27 @@ func ConvertClaudeRequestToGemini(modelName string, inputRawJSON []byte, _ bool)
 				out, _ = sjson.Set(out, "generationConfig.thinkingConfig.includeThoughts", true)
 			}
 		case "adaptive", "auto":
-			// Keep adaptive/auto as a high level sentinel; ApplyThinking resolves it
-			// to model-specific max capability.
-			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingLevel", "high")
+			// For adaptive thinking:
+			// - If output_config.effort is explicitly present, pass through as thinkingLevel.
+			// - Otherwise, treat it as "enabled with target-model maximum" and emit thinkingBudget=max.
+			// ApplyThinking handles clamping to target model's supported levels.
+			effort := ""
+			if v := gjson.GetBytes(rawJSON, "output_config.effort"); v.Exists() && v.Type == gjson.String {
+				effort = strings.ToLower(strings.TrimSpace(v.String()))
+			}
+			if effort != "" {
+				out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingLevel", effort)
+			} else {
+				maxBudget := 0
+				if mi := registry.LookupModelInfo(modelName, "gemini"); mi != nil && mi.Thinking != nil {
+					maxBudget = mi.Thinking.Max
+				}
+				if maxBudget > 0 {
+					out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingBudget", maxBudget)
+				} else {
+					out, _ = sjson.Set(out, "generationConfig.thinkingConfig.thinkingLevel", "high")
+				}
+			}
 			out, _ = sjson.Set(out, "generationConfig.thinkingConfig.includeThoughts", true)
 		}
 	}

internal/translator/openai/claude/openai_claude_request.go

@@ -76,9 +76,17 @@ func ConvertClaudeRequestToOpenAI(modelName string, inputRawJSON []byte, stream
 					}
 				}
 			case "adaptive", "auto":
-				// Claude adaptive/auto means "enable with max capacity"; keep it as highest level
-				// and let ApplyThinking normalize per target model capability.
-				out, _ = sjson.Set(out, "reasoning_effort", string(thinking.LevelXHigh))
+				// Adaptive thinking can carry an explicit effort in output_config.effort (Claude 4.6).
+				// Pass through directly; ApplyThinking handles clamping to target model's levels.
+				effort := ""
+				if v := root.Get("output_config.effort"); v.Exists() && v.Type == gjson.String {
+					effort = strings.ToLower(strings.TrimSpace(v.String()))
+				}
+				if effort != "" {
+					out, _ = sjson.Set(out, "reasoning_effort", effort)
+				} else {
+					out, _ = sjson.Set(out, "reasoning_effort", string(thinking.LevelXHigh))
+				}
 			case "disabled":
 				if effort, ok := thinking.ConvertBudgetToLevel(0); ok && effort != "" {
 					out, _ = sjson.Set(out, "reasoning_effort", effort)

sdk/cliproxy/auth/conductor_overrides_test.go

@@ -7,6 +7,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/google/uuid"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/registry"
 	cliproxyexecutor "github.com/router-for-me/CLIProxyAPI/v6/sdk/cliproxy/executor"
 )
 
@@ -115,8 +117,19 @@ func newCredentialRetryLimitTestManager(t *testing.T, maxRetryCredentials int) (
 	executor := &credentialRetryLimitExecutor{id: "claude"}
 	m.RegisterExecutor(executor)
 
-	auth1 := &Auth{ID: "auth-1", Provider: "claude"}
-	auth2 := &Auth{ID: "auth-2", Provider: "claude"}
+	baseID := uuid.NewString()
+	auth1 := &Auth{ID: baseID + "-auth-1", Provider: "claude"}
+	auth2 := &Auth{ID: baseID + "-auth-2", Provider: "claude"}
+
+	// Auth selection requires that the global model registry knows each credential supports the model.
+	reg := registry.GetGlobalRegistry()
+	reg.RegisterClient(auth1.ID, "claude", []*registry.ModelInfo{{ID: "test-model"}})
+	reg.RegisterClient(auth2.ID, "claude", []*registry.ModelInfo{{ID: "test-model"}})
+	t.Cleanup(func() {
+		reg.UnregisterClient(auth1.ID)
+		reg.UnregisterClient(auth2.ID)
+	})
+
 	if _, errRegister := m.Register(context.Background(), auth1); errRegister != nil {
 		t.Fatalf("register auth1: %v", errRegister)
 	}

test/thinking_conversion_test.go

@@ -34,6 +34,8 @@ type thinkingTestCase struct {
 	inputJSON       string
 	expectField     string
 	expectValue     string
+	expectField2    string
+	expectValue2    string
 	includeThoughts string
 	expectErr       bool
 }
@@ -384,15 +386,17 @@ func TestThinkingE2EMatrix_Suffix(t *testing.T) {
 			includeThoughts: "true",
 			expectErr:       false,
 		},
-		// Case 30: Effort xhigh → not in low/high → error
+		// Case 30: Effort xhigh → clamped to high
 		{
-			name:        "30",
-			from:        "openai",
-			to:          "gemini",
-			model:       "gemini-mixed-model(xhigh)",
-			inputJSON:   `{"model":"gemini-mixed-model(xhigh)","messages":[{"role":"user","content":"hi"}]}`,
-			expectField: "",
-			expectErr:   true,
+			name:            "30",
+			from:            "openai",
+			to:              "gemini",
+			model:           "gemini-mixed-model(xhigh)",
+			inputJSON:       `{"model":"gemini-mixed-model(xhigh)","messages":[{"role":"user","content":"hi"}]}`,
+			expectField:     "generationConfig.thinkingConfig.thinkingLevel",
+			expectValue:     "high",
+			includeThoughts: "true",
+			expectErr:       false,
 		},
 		// Case 31: Effort none → clamped to low (min supported) → includeThoughts=false
 		{
@@ -1782,15 +1786,17 @@ func TestThinkingE2EMatrix_Body(t *testing.T) {
 			includeThoughts: "true",
 			expectErr:       false,
 		},
-		// Case 30: reasoning_effort=xhigh → error (not in low/high)
+		// Case 30: reasoning_effort=xhigh → clamped to high
 		{
-			name:        "30",
-			from:        "openai",
-			to:          "gemini",
-			model:       "gemini-mixed-model",
-			inputJSON:   `{"model":"gemini-mixed-model","messages":[{"role":"user","content":"hi"}],"reasoning_effort":"xhigh"}`,
-			expectField: "",
-			expectErr:   true,
+			name:            "30",
+			from:            "openai",
+			to:              "gemini",
+			model:           "gemini-mixed-model",
+			inputJSON:       `{"model":"gemini-mixed-model","messages":[{"role":"user","content":"hi"}],"reasoning_effort":"xhigh"}`,
+			expectField:     "generationConfig.thinkingConfig.thinkingLevel",
+			expectValue:     "high",
+			includeThoughts: "true",
+			expectErr:       false,
 		},
 		// Case 31: reasoning_effort=none → clamped to low → includeThoughts=false
 		{
@@ -2822,9 +2828,8 @@ func TestThinkingE2EMatrix_Body(t *testing.T) {
 	runThinkingTests(t, cases)
 }
 
-// TestThinkingE2EClaudeAdaptive_Body tests Claude thinking.type=adaptive extended body-only cases.
-// These cases validate that adaptive means "thinking enabled without explicit budget", and
-// cross-protocol conversion should resolve to target-model maximum thinking capability.
+// TestThinkingE2EClaudeAdaptive_Body covers Group 3 cases in docs/thinking-e2e-test-cases.md.
+// It focuses on Claude 4.6 adaptive thinking and effort/level cross-protocol semantics (body-only).
 func TestThinkingE2EClaudeAdaptive_Body(t *testing.T) {
 	reg := registry.GetGlobalRegistry()
 	uid := fmt.Sprintf("thinking-e2e-claude-adaptive-%d", time.Now().UnixNano())
@@ -2833,32 +2838,347 @@ func TestThinkingE2EClaudeAdaptive_Body(t *testing.T) {
 	defer reg.UnregisterClient(uid)
 
 	cases := []thinkingTestCase{
-		// A1: Claude adaptive to OpenAI level model -> highest supported level
+		// A subgroup: OpenAI -> Claude (reasoning_effort -> output_config.effort)
 		{
 			name:        "A1",
+			from:        "openai",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","messages":[{"role":"user","content":"hi"}],"reasoning_effort":"minimal"}`,
+			expectField: "output_config.effort",
+			expectValue: "low",
+			expectErr:   false,
+		},
+		{
+			name:        "A2",
+			from:        "openai",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","messages":[{"role":"user","content":"hi"}],"reasoning_effort":"low"}`,
+			expectField: "output_config.effort",
+			expectValue: "low",
+			expectErr:   false,
+		},
+		{
+			name:        "A3",
+			from:        "openai",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","messages":[{"role":"user","content":"hi"}],"reasoning_effort":"medium"}`,
+			expectField: "output_config.effort",
+			expectValue: "medium",
+			expectErr:   false,
+		},
+		{
+			name:        "A4",
+			from:        "openai",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","messages":[{"role":"user","content":"hi"}],"reasoning_effort":"high"}`,
+			expectField: "output_config.effort",
+			expectValue: "high",
+			expectErr:   false,
+		},
+		{
+			name:        "A5",
+			from:        "openai",
+			to:          "claude",
+			model:       "claude-opus-4-6-model",
+			inputJSON:   `{"model":"claude-opus-4-6-model","messages":[{"role":"user","content":"hi"}],"reasoning_effort":"xhigh"}`,
+			expectField: "output_config.effort",
+			expectValue: "max",
+			expectErr:   false,
+		},
+		{
+			name:        "A6",
+			from:        "openai",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","messages":[{"role":"user","content":"hi"}],"reasoning_effort":"xhigh"}`,
+			expectField: "output_config.effort",
+			expectValue: "high",
+			expectErr:   false,
+		},
+		{
+			name:        "A7",
+			from:        "openai",
+			to:          "claude",
+			model:       "claude-opus-4-6-model",
+			inputJSON:   `{"model":"claude-opus-4-6-model","messages":[{"role":"user","content":"hi"}],"reasoning_effort":"max"}`,
+			expectField: "output_config.effort",
+			expectValue: "max",
+			expectErr:   false,
+		},
+		{
+			name:        "A8",
+			from:        "openai",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","messages":[{"role":"user","content":"hi"}],"reasoning_effort":"max"}`,
+			expectField: "output_config.effort",
+			expectValue: "high",
+			expectErr:   false,
+		},
+
+		// B subgroup: Gemini -> Claude (thinkingLevel/thinkingBudget -> output_config.effort)
+		{
+			name:        "B1",
+			from:        "gemini",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","contents":[{"role":"user","parts":[{"text":"hi"}]}],"generationConfig":{"thinkingConfig":{"thinkingLevel":"minimal"}}}`,
+			expectField: "output_config.effort",
+			expectValue: "low",
+			expectErr:   false,
+		},
+		{
+			name:        "B2",
+			from:        "gemini",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","contents":[{"role":"user","parts":[{"text":"hi"}]}],"generationConfig":{"thinkingConfig":{"thinkingLevel":"low"}}}`,
+			expectField: "output_config.effort",
+			expectValue: "low",
+			expectErr:   false,
+		},
+		{
+			name:        "B3",
+			from:        "gemini",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","contents":[{"role":"user","parts":[{"text":"hi"}]}],"generationConfig":{"thinkingConfig":{"thinkingLevel":"medium"}}}`,
+			expectField: "output_config.effort",
+			expectValue: "medium",
+			expectErr:   false,
+		},
+		{
+			name:        "B4",
+			from:        "gemini",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","contents":[{"role":"user","parts":[{"text":"hi"}]}],"generationConfig":{"thinkingConfig":{"thinkingLevel":"high"}}}`,
+			expectField: "output_config.effort",
+			expectValue: "high",
+			expectErr:   false,
+		},
+		{
+			name:        "B5",
+			from:        "gemini",
+			to:          "claude",
+			model:       "claude-opus-4-6-model",
+			inputJSON:   `{"model":"claude-opus-4-6-model","contents":[{"role":"user","parts":[{"text":"hi"}]}],"generationConfig":{"thinkingConfig":{"thinkingLevel":"xhigh"}}}`,
+			expectField: "output_config.effort",
+			expectValue: "max",
+			expectErr:   false,
+		},
+		{
+			name:        "B6",
+			from:        "gemini",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","contents":[{"role":"user","parts":[{"text":"hi"}]}],"generationConfig":{"thinkingConfig":{"thinkingLevel":"xhigh"}}}`,
+			expectField: "output_config.effort",
+			expectValue: "high",
+			expectErr:   false,
+		},
+		{
+			name:        "B7",
+			from:        "gemini",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","contents":[{"role":"user","parts":[{"text":"hi"}]}],"generationConfig":{"thinkingConfig":{"thinkingBudget":512}}}`,
+			expectField: "output_config.effort",
+			expectValue: "low",
+			expectErr:   false,
+		},
+		{
+			name:        "B8",
+			from:        "gemini",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","contents":[{"role":"user","parts":[{"text":"hi"}]}],"generationConfig":{"thinkingConfig":{"thinkingBudget":1024}}}`,
+			expectField: "output_config.effort",
+			expectValue: "low",
+			expectErr:   false,
+		},
+		{
+			name:        "B9",
+			from:        "gemini",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","contents":[{"role":"user","parts":[{"text":"hi"}]}],"generationConfig":{"thinkingConfig":{"thinkingBudget":8192}}}`,
+			expectField: "output_config.effort",
+			expectValue: "medium",
+			expectErr:   false,
+		},
+		{
+			name:        "B10",
+			from:        "gemini",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","contents":[{"role":"user","parts":[{"text":"hi"}]}],"generationConfig":{"thinkingConfig":{"thinkingBudget":24576}}}`,
+			expectField: "output_config.effort",
+			expectValue: "high",
+			expectErr:   false,
+		},
+		{
+			name:        "B11",
+			from:        "gemini",
+			to:          "claude",
+			model:       "claude-opus-4-6-model",
+			inputJSON:   `{"model":"claude-opus-4-6-model","contents":[{"role":"user","parts":[{"text":"hi"}]}],"generationConfig":{"thinkingConfig":{"thinkingBudget":32768}}}`,
+			expectField: "output_config.effort",
+			expectValue: "max",
+			expectErr:   false,
+		},
+		{
+			name:        "B12",
+			from:        "gemini",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","contents":[{"role":"user","parts":[{"text":"hi"}]}],"generationConfig":{"thinkingConfig":{"thinkingBudget":32768}}}`,
+			expectField: "output_config.effort",
+			expectValue: "high",
+			expectErr:   false,
+		},
+		{
+			name:        "B13",
+			from:        "gemini",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","contents":[{"role":"user","parts":[{"text":"hi"}]}],"generationConfig":{"thinkingConfig":{"thinkingBudget":0}}}`,
+			expectField: "thinking.type",
+			expectValue: "disabled",
+			expectErr:   false,
+		},
+		{
+			name:        "B14",
+			from:        "gemini",
+			to:          "claude",
+			model:       "claude-sonnet-4-6-model",
+			inputJSON:   `{"model":"claude-sonnet-4-6-model","contents":[{"role":"user","parts":[{"text":"hi"}]}],"generationConfig":{"thinkingConfig":{"thinkingBudget":-1}}}`,
+			expectField: "output_config.effort",
+			expectValue: "high",
+			expectErr:   false,
+		},
+
+		// C subgroup: Claude adaptive + effort cross-protocol conversion
+		{
+			name:        "C1",
 			from:        "claude",
 			to:          "openai",
 			model:       "level-model",
-			inputJSON:   `{"model":"level-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"}}`,
+			inputJSON:   `{"model":"level-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"minimal"}}`,
+			expectField: "reasoning_effort",
+			expectValue: "minimal",
+			expectErr:   false,
+		},
+		{
+			name:        "C2",
+			from:        "claude",
+			to:          "openai",
+			model:       "level-model",
+			inputJSON:   `{"model":"level-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"low"}}`,
+			expectField: "reasoning_effort",
+			expectValue: "low",
+			expectErr:   false,
+		},
+		{
+			name:        "C3",
+			from:        "claude",
+			to:          "openai",
+			model:       "level-model",
+			inputJSON:   `{"model":"level-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"medium"}}`,
+			expectField: "reasoning_effort",
+			expectValue: "medium",
+			expectErr:   false,
+		},
+		{
+			name:        "C4",
+			from:        "claude",
+			to:          "openai",
+			model:       "level-model",
+			inputJSON:   `{"model":"level-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"high"}}`,
 			expectField: "reasoning_effort",
 			expectValue: "high",
 			expectErr:   false,
 		},
-		// A2: Claude adaptive to Gemini level subset model -> highest supported level
 		{
-			name:            "A2",
+			name:        "C5",
+			from:        "claude",
+			to:          "openai",
+			model:       "level-model",
+			inputJSON:   `{"model":"level-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"xhigh"}}`,
+			expectField: "reasoning_effort",
+			expectValue: "high",
+			expectErr:   false,
+		},
+		{
+			name:        "C6",
+			from:        "claude",
+			to:          "openai",
+			model:       "level-model",
+			inputJSON:   `{"model":"level-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"max"}}`,
+			expectField: "reasoning_effort",
+			expectValue: "high",
+			expectErr:   false,
+		},
+		{
+			name:        "C7",
+			from:        "claude",
+			to:          "openai",
+			model:       "no-thinking-model",
+			inputJSON:   `{"model":"no-thinking-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"high"}}`,
+			expectField: "",
+			expectErr:   false,
+		},
+
+		{
+			name:            "C8",
 			from:            "claude",
 			to:              "gemini",
 			model:           "level-subset-model",
-			inputJSON:       `{"model":"level-subset-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"}}`,
+			inputJSON:       `{"model":"level-subset-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"high"}}`,
 			expectField:     "generationConfig.thinkingConfig.thinkingLevel",
 			expectValue:     "high",
 			includeThoughts: "true",
 			expectErr:       false,
 		},
-		// A3: Claude adaptive to Gemini budget model -> max budget
 		{
-			name:            "A3",
+			name:            "C9",
+			from:            "claude",
+			to:              "gemini",
+			model:           "gemini-budget-model",
+			inputJSON:       `{"model":"gemini-budget-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"low"}}`,
+			expectField:     "generationConfig.thinkingConfig.thinkingBudget",
+			expectValue:     "1024",
+			includeThoughts: "true",
+			expectErr:       false,
+		},
+		{
+			name:            "C10",
+			from:            "claude",
+			to:              "gemini",
+			model:           "gemini-budget-model",
+			inputJSON:       `{"model":"gemini-budget-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"medium"}}`,
+			expectField:     "generationConfig.thinkingConfig.thinkingBudget",
+			expectValue:     "8192",
+			includeThoughts: "true",
+			expectErr:       false,
+		},
+		{
+			name:            "C11",
+			from:            "claude",
+			to:              "gemini",
+			model:           "gemini-budget-model",
+			inputJSON:       `{"model":"gemini-budget-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"high"}}`,
+			expectField:     "generationConfig.thinkingConfig.thinkingBudget",
+			expectValue:     "20000",
+			includeThoughts: "true",
+			expectErr:       false,
+		},
+		{
+			name:            "C12",
 			from:            "claude",
 			to:              "gemini",
 			model:           "gemini-budget-model",
@@ -2868,32 +3188,91 @@ func TestThinkingE2EClaudeAdaptive_Body(t *testing.T) {
 			includeThoughts: "true",
 			expectErr:       false,
 		},
-		// A4: Claude adaptive to Gemini mixed model -> highest supported level
 		{
-			name:            "A4",
+			name:            "C13",
 			from:            "claude",
 			to:              "gemini",
 			model:           "gemini-mixed-model",
-			inputJSON:       `{"model":"gemini-mixed-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"}}`,
+			inputJSON:       `{"model":"gemini-mixed-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"high"}}`,
 			expectField:     "generationConfig.thinkingConfig.thinkingLevel",
 			expectValue:     "high",
 			includeThoughts: "true",
 			expectErr:       false,
 		},
-		// A5: Claude adaptive passthrough for same protocol
+
 		{
-			name:        "A5",
+			name:        "C14",
 			from:        "claude",
-			to:          "claude",
-			model:       "claude-budget-model",
-			inputJSON:   `{"model":"claude-budget-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"}}`,
-			expectField: "thinking.type",
-			expectValue: "adaptive",
+			to:          "codex",
+			model:       "level-model",
+			inputJSON:   `{"model":"level-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"minimal"}}`,
+			expectField: "reasoning.effort",
+			expectValue: "minimal",
 			expectErr:   false,
 		},
-		// A6: Claude adaptive to Antigravity budget model -> max budget
 		{
-			name:            "A6",
+			name:        "C15",
+			from:        "claude",
+			to:          "codex",
+			model:       "level-model",
+			inputJSON:   `{"model":"level-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"low"}}`,
+			expectField: "reasoning.effort",
+			expectValue: "low",
+			expectErr:   false,
+		},
+		{
+			name:        "C16",
+			from:        "claude",
+			to:          "codex",
+			model:       "level-model",
+			inputJSON:   `{"model":"level-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"high"}}`,
+			expectField: "reasoning.effort",
+			expectValue: "high",
+			expectErr:   false,
+		},
+		{
+			name:        "C17",
+			from:        "claude",
+			to:          "codex",
+			model:       "level-model",
+			inputJSON:   `{"model":"level-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"xhigh"}}`,
+			expectField: "reasoning.effort",
+			expectValue: "high",
+			expectErr:   false,
+		},
+		{
+			name:        "C18",
+			from:        "claude",
+			to:          "codex",
+			model:       "level-model",
+			inputJSON:   `{"model":"level-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"max"}}`,
+			expectField: "reasoning.effort",
+			expectValue: "high",
+			expectErr:   false,
+		},
+
+		{
+			name:        "C19",
+			from:        "claude",
+			to:          "iflow",
+			model:       "glm-test",
+			inputJSON:   `{"model":"glm-test","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"minimal"}}`,
+			expectField: "chat_template_kwargs.enable_thinking",
+			expectValue: "true",
+			expectErr:   false,
+		},
+		{
+			name:        "C20",
+			from:        "claude",
+			to:          "iflow",
+			model:       "minimax-test",
+			inputJSON:   `{"model":"minimax-test","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"high"}}`,
+			expectField: "reasoning_split",
+			expectValue: "true",
+			expectErr:   false,
+		},
+		{
+			name:            "C21",
 			from:            "claude",
 			to:              "antigravity",
 			model:           "antigravity-budget-model",
@@ -2903,48 +3282,66 @@ func TestThinkingE2EClaudeAdaptive_Body(t *testing.T) {
 			includeThoughts: "true",
 			expectErr:       false,
 		},
-		// A7: Claude adaptive to iFlow GLM -> enabled boolean
+
 		{
-			name:        "A7",
-			from:        "claude",
-			to:          "iflow",
-			model:       "glm-test",
-			inputJSON:   `{"model":"glm-test","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"}}`,
-			expectField: "chat_template_kwargs.enable_thinking",
-			expectValue: "true",
-			expectErr:   false,
+			name:         "C22",
+			from:         "claude",
+			to:           "claude",
+			model:        "claude-sonnet-4-6-model",
+			inputJSON:    `{"model":"claude-sonnet-4-6-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"medium"}}`,
+			expectField:  "thinking.type",
+			expectValue:  "adaptive",
+			expectField2: "output_config.effort",
+			expectValue2: "medium",
+			expectErr:    false,
 		},
-		// A8: Claude adaptive to iFlow MiniMax -> enabled boolean
 		{
-			name:        "A8",
-			from:        "claude",
-			to:          "iflow",
-			model:       "minimax-test",
-			inputJSON:   `{"model":"minimax-test","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"}}`,
-			expectField: "reasoning_split",
-			expectValue: "true",
-			expectErr:   false,
+			name:         "C23",
+			from:         "claude",
+			to:           "claude",
+			model:        "claude-opus-4-6-model",
+			inputJSON:    `{"model":"claude-opus-4-6-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"max"}}`,
+			expectField:  "thinking.type",
+			expectValue:  "adaptive",
+			expectField2: "output_config.effort",
+			expectValue2: "max",
+			expectErr:    false,
 		},
-		// A9: Claude adaptive to Codex level model -> highest supported level
 		{
-			name:        "A9",
-			from:        "claude",
-			to:          "codex",
-			model:       "level-model",
-			inputJSON:   `{"model":"level-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"}}`,
-			expectField: "reasoning.effort",
-			expectValue: "high",
-			expectErr:   false,
+			name:      "C24",
+			from:      "claude",
+			to:        "claude",
+			model:     "claude-opus-4-6-model",
+			inputJSON: `{"model":"claude-opus-4-6-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"xhigh"}}`,
+			expectErr: true,
 		},
-		// A10: Claude adaptive on non-thinking model should still be stripped
 		{
-			name:        "A10",
-			from:        "claude",
-			to:          "openai",
-			model:       "no-thinking-model",
-			inputJSON:   `{"model":"no-thinking-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"}}`,
-			expectField: "",
-			expectErr:   false,
+			name:         "C25",
+			from:         "claude",
+			to:           "claude",
+			model:        "claude-sonnet-4-6-model",
+			inputJSON:    `{"model":"claude-sonnet-4-6-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"high"}}`,
+			expectField:  "thinking.type",
+			expectValue:  "adaptive",
+			expectField2: "output_config.effort",
+			expectValue2: "high",
+			expectErr:    false,
+		},
+		{
+			name:      "C26",
+			from:      "claude",
+			to:        "claude",
+			model:     "claude-sonnet-4-6-model",
+			inputJSON: `{"model":"claude-sonnet-4-6-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"max"}}`,
+			expectErr: true,
+		},
+		{
+			name:      "C27",
+			from:      "claude",
+			to:        "claude",
+			model:     "claude-sonnet-4-6-model",
+			inputJSON: `{"model":"claude-sonnet-4-6-model","messages":[{"role":"user","content":"hi"}],"thinking":{"type":"adaptive"},"output_config":{"effort":"xhigh"}}`,
+			expectErr: true,
 		},
 	}
 
@@ -2999,6 +3396,29 @@ func getTestModels() []*registry.ModelInfo {
 			DisplayName: "Claude Budget Model",
 			Thinking:    &registry.ThinkingSupport{Min: 1024, Max: 128000, ZeroAllowed: true, DynamicAllowed: false},
 		},
+		{
+			ID:                  "claude-sonnet-4-6-model",
+			Object:              "model",
+			Created:             1771372800, // 2026-02-17
+			OwnedBy:             "anthropic",
+			Type:                "claude",
+			DisplayName:         "Claude 4.6 Sonnet",
+			ContextLength:       200000,
+			MaxCompletionTokens: 64000,
+			Thinking:            &registry.ThinkingSupport{Min: 1024, Max: 128000, ZeroAllowed: true, DynamicAllowed: false, Levels: []string{"low", "medium", "high"}},
+		},
+		{
+			ID:                  "claude-opus-4-6-model",
+			Object:              "model",
+			Created:             1770318000, // 2026-02-05
+			OwnedBy:             "anthropic",
+			Type:                "claude",
+			DisplayName:         "Claude 4.6 Opus",
+			Description:         "Premium model combining maximum intelligence with practical performance",
+			ContextLength:       1000000,
+			MaxCompletionTokens: 128000,
+			Thinking:            &registry.ThinkingSupport{Min: 1024, Max: 128000, ZeroAllowed: true, DynamicAllowed: false, Levels: []string{"low", "medium", "high", "max"}},
+		},
 		{
 			ID:          "antigravity-budget-model",
 			Object:      "model",
@@ -3165,17 +3585,23 @@ func runThinkingTests(t *testing.T, cases []thinkingTestCase) {
 				return
 			}
 
-			val := gjson.GetBytes(body, tc.expectField)
-			if !val.Exists() {
-				t.Fatalf("expected field %s not found, body=%s", tc.expectField, string(body))
+			assertField := func(fieldPath, expected string) {
+				val := gjson.GetBytes(body, fieldPath)
+				if !val.Exists() {
+					t.Fatalf("expected field %s not found, body=%s", fieldPath, string(body))
+				}
+				actualValue := val.String()
+				if val.Type == gjson.Number {
+					actualValue = fmt.Sprintf("%d", val.Int())
+				}
+				if actualValue != expected {
+					t.Fatalf("field %s: expected %q, got %q, body=%s", fieldPath, expected, actualValue, string(body))
+				}
 			}
 
-			actualValue := val.String()
-			if val.Type == gjson.Number {
-				actualValue = fmt.Sprintf("%d", val.Int())
-			}
-			if actualValue != tc.expectValue {
-				t.Fatalf("field %s: expected %q, got %q, body=%s", tc.expectField, tc.expectValue, actualValue, string(body))
+			assertField(tc.expectField, tc.expectValue)
+			if tc.expectField2 != "" {
+				assertField(tc.expectField2, tc.expectValue2)
 			}
 
 			if tc.includeThoughts != "" && (tc.to == "gemini" || tc.to == "gemini-cli" || tc.to == "antigravity") {