feat(thinking): add HasLevel and MapToClaudeEffort functions for adaptive thinking support

internal/thinking/convert.go

@@ -96,6 +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/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/translator/claude/gemini/claude_gemini_request.go

@@ -116,37 +116,9 @@ 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() {
-			hasLevel := func(levels []string, target string) bool {
-				for _, level := range levels {
-					if strings.EqualFold(strings.TrimSpace(level), target) {
-						return true
-					}
-				}
-				return false
-			}
 			mi := registry.LookupModelInfo(modelName, "claude")
 			supportsAdaptive := mi != nil && mi.Thinking != nil && len(mi.Thinking.Levels) > 0
-			supportsMax := supportsAdaptive && hasLevel(mi.Thinking.Levels, "max")
-			mapToEffort := func(level string) (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
-				}
-			}
+			supportsMax := supportsAdaptive && thinking.HasLevel(mi.Thinking.Levels, string(thinking.LevelMax))
 
 			thinkingLevel := thinkingConfig.Get("thinkingLevel")
 			if !thinkingLevel.Exists() {
@@ -162,7 +134,7 @@ func ConvertGeminiRequestToClaude(modelName string, inputRawJSON []byte, stream
 						out, _ = sjson.Delete(out, "thinking.budget_tokens")
 						out, _ = sjson.Delete(out, "output_config.effort")
 					default:
-						effort, ok := mapToEffort(level)
+						effort, ok := thinking.MapToClaudeEffort(level, supportsMax)
 						if ok {
 							out, _ = sjson.Set(out, "thinking.type", "adaptive")
 							out, _ = sjson.Delete(out, "thinking.budget_tokens")
@@ -201,7 +173,7 @@ func ConvertGeminiRequestToClaude(modelName string, inputRawJSON []byte, stream
 						default:
 							level, ok := thinking.ConvertBudgetToLevel(budget)
 							if ok {
-								effort, ok := mapToEffort(level)
+								effort, ok := thinking.MapToClaudeEffort(level, supportsMax)
 								if ok {
 									out, _ = sjson.Set(out, "thinking.type", "adaptive")
 									out, _ = sjson.Delete(out, "thinking.budget_tokens")

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

@@ -69,17 +69,9 @@ func ConvertOpenAIRequestToClaude(modelName string, inputRawJSON []byte, stream
 	if v := root.Get("reasoning_effort"); v.Exists() {
 		effort := strings.ToLower(strings.TrimSpace(v.String()))
 		if effort != "" {
-			hasLevel := func(levels []string, target string) bool {
-				for _, level := range levels {
-					if strings.EqualFold(strings.TrimSpace(level), target) {
-						return true
-					}
-				}
-				return false
-			}
 			mi := registry.LookupModelInfo(modelName, "claude")
 			supportsAdaptive := mi != nil && mi.Thinking != nil && len(mi.Thinking.Levels) > 0
-			supportsMax := supportsAdaptive && hasLevel(mi.Thinking.Levels, "max")
+			supportsMax := supportsAdaptive && thinking.HasLevel(mi.Thinking.Levels, string(thinking.LevelMax))
 
 			// Claude 4.6 supports adaptive thinking with output_config.effort.
 			if supportsAdaptive {
@@ -94,19 +86,8 @@ func ConvertOpenAIRequestToClaude(modelName string, inputRawJSON []byte, stream
 					out, _ = sjson.Delete(out, "output_config.effort")
 				default:
 					// Map non-Claude effort levels into Claude 4.6 effort vocabulary.
-					switch effort {
-					case "minimal":
-						effort = "low"
-					case "xhigh":
-						if supportsMax {
-							effort = "max"
-						} else {
-							effort = "high"
-						}
-					case "max":
-						if !supportsMax {
-							effort = "high"
-						}
+					if mapped, ok := thinking.MapToClaudeEffort(effort, supportsMax); ok {
+						effort = mapped
 					}
 					out, _ = sjson.Set(out, "thinking.type", "adaptive")
 					out, _ = sjson.Delete(out, "thinking.budget_tokens")

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

@@ -57,17 +57,9 @@ func ConvertOpenAIResponsesRequestToClaude(modelName string, inputRawJSON []byte
 	if v := root.Get("reasoning.effort"); v.Exists() {
 		effort := strings.ToLower(strings.TrimSpace(v.String()))
 		if effort != "" {
-			hasLevel := func(levels []string, target string) bool {
-				for _, level := range levels {
-					if strings.EqualFold(strings.TrimSpace(level), target) {
-						return true
-					}
-				}
-				return false
-			}
 			mi := registry.LookupModelInfo(modelName, "claude")
 			supportsAdaptive := mi != nil && mi.Thinking != nil && len(mi.Thinking.Levels) > 0
-			supportsMax := supportsAdaptive && hasLevel(mi.Thinking.Levels, "max")
+			supportsMax := supportsAdaptive && thinking.HasLevel(mi.Thinking.Levels, string(thinking.LevelMax))
 
 			// Claude 4.6 supports adaptive thinking with output_config.effort.
 			if supportsAdaptive {
@@ -82,19 +74,8 @@ func ConvertOpenAIResponsesRequestToClaude(modelName string, inputRawJSON []byte
 					out, _ = sjson.Delete(out, "output_config.effort")
 				default:
 					// Map non-Claude effort levels into Claude 4.6 effort vocabulary.
-					switch effort {
-					case "minimal":
-						effort = "low"
-					case "xhigh":
-						if supportsMax {
-							effort = "max"
-						} else {
-							effort = "high"
-						}
-					case "max":
-						if !supportsMax {
-							effort = "high"
-						}
+					if mapped, ok := thinking.MapToClaudeEffort(effort, supportsMax); ok {
+						effort = mapped
 					}
 					out, _ = sjson.Set(out, "thinking.type", "adaptive")
 					out, _ = sjson.Delete(out, "thinking.budget_tokens")