diff --git a/internal/registry/model_definitions.go b/internal/registry/model_definitions.go
index 46b99695..cf6b3f09 100644
--- a/internal/registry/model_definitions.go
+++ b/internal/registry/model_definitions.go
@@ -442,6 +442,18 @@ func GetKiroModels() []*ModelInfo {
 			MaxCompletionTokens: 64000,
 			Thinking:            &ThinkingSupport{Min: 1024, Max: 32000, ZeroAllowed: true, DynamicAllowed: true},
 		},
+		{
+			ID:                  "kiro-claude-sonnet-4-6",
+			Object:              "model",
+			Created:             1739836800, // 2025-02-18
+			OwnedBy:             "aws",
+			Type:                "kiro",
+			DisplayName:         "Kiro Claude Sonnet 4.6",
+			Description:         "Claude Sonnet 4.6 via Kiro (1.3x credit)",
+			ContextLength:       200000,
+			MaxCompletionTokens: 64000,
+			Thinking:            &ThinkingSupport{Min: 1024, Max: 32000, ZeroAllowed: true, DynamicAllowed: true},
+		},
 		{
 			ID:                  "kiro-claude-opus-4-5",
 			Object:              "model",
@@ -584,6 +596,18 @@ func GetKiroModels() []*ModelInfo {
 			MaxCompletionTokens: 64000,
 			Thinking:            &ThinkingSupport{Min: 1024, Max: 32000, ZeroAllowed: true, DynamicAllowed: true},
 		},
+		{
+			ID:                  "kiro-claude-sonnet-4-6-agentic",
+			Object:              "model",
+			Created:             1739836800, // 2025-02-18
+			OwnedBy:             "aws",
+			Type:                "kiro",
+			DisplayName:         "Kiro Claude Sonnet 4.6 (Agentic)",
+			Description:         "Claude Sonnet 4.6 optimized for coding agents (chunked writes)",
+			ContextLength:       200000,
+			MaxCompletionTokens: 64000,
+			Thinking:            &ThinkingSupport{Min: 1024, Max: 32000, ZeroAllowed: true, DynamicAllowed: true},
+		},
 		{
 			ID:                  "kiro-claude-opus-4-5-agentic",
 			Object:              "model",
diff --git a/internal/registry/model_definitions_static_data.go b/internal/registry/model_definitions_static_data.go
index 6acd49dc..5625efea 100644
--- a/internal/registry/model_definitions_static_data.go
+++ b/internal/registry/model_definitions_static_data.go
@@ -907,6 +907,7 @@ func GetAntigravityModelConfig() map[string]*AntigravityModelConfig {
 		"gemini-3-flash":             {Thinking: &ThinkingSupport{Min: 128, Max: 32768, ZeroAllowed: false, DynamicAllowed: true, Levels: []string{"minimal", "low", "medium", "high"}}},
 		"claude-opus-4-5-thinking":   {Thinking: &ThinkingSupport{Min: 1024, Max: 128000, ZeroAllowed: true, DynamicAllowed: true}, MaxCompletionTokens: 64000},
 		"claude-opus-4-6-thinking":   {Thinking: &ThinkingSupport{Min: 1024, Max: 128000, ZeroAllowed: true, DynamicAllowed: true}, MaxCompletionTokens: 64000},
+		"claude-sonnet-4-6-thinking": {Thinking: &ThinkingSupport{Min: 1024, Max: 128000, ZeroAllowed: true, DynamicAllowed: true}, MaxCompletionTokens: 64000},
 		"claude-sonnet-4-5":          {MaxCompletionTokens: 64000},
 		"claude-sonnet-4-5-thinking": {Thinking: &ThinkingSupport{Min: 1024, Max: 128000, ZeroAllowed: true, DynamicAllowed: true}, MaxCompletionTokens: 64000},
 		"claude-sonnet-4-6":          {MaxCompletionTokens: 64000},
diff --git a/internal/runtime/executor/kiro_executor.go b/internal/runtime/executor/kiro_executor.go
index 41a5830c..e1a280b9 100644
--- a/internal/runtime/executor/kiro_executor.go
+++ b/internal/runtime/executor/kiro_executor.go
@@ -1709,6 +1709,7 @@ func (e *KiroExecutor) mapModelToKiro(model string) string {
 		// Amazon Q format (amazonq- prefix) - same API as Kiro
 		"amazonq-auto":                       "auto",
 		"amazonq-claude-opus-4-6":            "claude-opus-4.6",
+		"amazonq-claude-sonnet-4-6":          "claude-sonnet-4.6",
 		"amazonq-claude-opus-4-5":            "claude-opus-4.5",
 		"amazonq-claude-sonnet-4-5":          "claude-sonnet-4.5",
 		"amazonq-claude-sonnet-4-5-20250929": "claude-sonnet-4.5",
@@ -1717,6 +1718,7 @@ func (e *KiroExecutor) mapModelToKiro(model string) string {
 		"amazonq-claude-haiku-4-5":           "claude-haiku-4.5",
 		// Kiro format (kiro- prefix) - valid model names that should be preserved
 		"kiro-claude-opus-4-6":            "claude-opus-4.6",
+		"kiro-claude-sonnet-4-6":          "claude-sonnet-4.6",
 		"kiro-claude-opus-4-5":            "claude-opus-4.5",
 		"kiro-claude-sonnet-4-5":          "claude-sonnet-4.5",
 		"kiro-claude-sonnet-4-5-20250929": "claude-sonnet-4.5",
@@ -1727,6 +1729,8 @@ func (e *KiroExecutor) mapModelToKiro(model string) string {
 		// Native format (no prefix) - used by Kiro IDE directly
 		"claude-opus-4-6":            "claude-opus-4.6",
 		"claude-opus-4.6":            "claude-opus-4.6",
+		"claude-sonnet-4-6":          "claude-sonnet-4.6",
+		"claude-sonnet-4.6":          "claude-sonnet-4.6",
 		"claude-opus-4-5":            "claude-opus-4.5",
 		"claude-opus-4.5":            "claude-opus-4.5",
 		"claude-haiku-4-5":           "claude-haiku-4.5",
@@ -1739,11 +1743,13 @@ func (e *KiroExecutor) mapModelToKiro(model string) string {
 		"auto":                       "auto",
 		// Agentic variants (same backend model IDs, but with special system prompt)
 		"claude-opus-4.6-agentic":        "claude-opus-4.6",
+		"claude-sonnet-4.6-agentic":      "claude-sonnet-4.6",
 		"claude-opus-4.5-agentic":        "claude-opus-4.5",
 		"claude-sonnet-4.5-agentic":      "claude-sonnet-4.5",
 		"claude-sonnet-4-agentic":        "claude-sonnet-4",
 		"claude-haiku-4.5-agentic":       "claude-haiku-4.5",
 		"kiro-claude-opus-4-6-agentic":   "claude-opus-4.6",
+		"kiro-claude-sonnet-4-6-agentic": "claude-sonnet-4.6",
 		"kiro-claude-opus-4-5-agentic":   "claude-opus-4.5",
 		"kiro-claude-sonnet-4-5-agentic": "claude-sonnet-4.5",
 		"kiro-claude-sonnet-4-agentic":   "claude-sonnet-4",
@@ -1769,6 +1775,10 @@ func (e *KiroExecutor) mapModelToKiro(model string) string {
 			log.Debugf("kiro: unknown Sonnet 3.7 model '%s', mapping to claude-3-7-sonnet-20250219", model)
 			return "claude-3-7-sonnet-20250219"
 		}
+		if strings.Contains(modelLower, "4-6") || strings.Contains(modelLower, "4.6") {
+			log.Debugf("kiro: unknown Sonnet 4.6 model '%s', mapping to claude-sonnet-4.6", model)
+			return "claude-sonnet-4.6"
+		}
 		if strings.Contains(modelLower, "4-5") || strings.Contains(modelLower, "4.5") {
 			log.Debugf("kiro: unknown Sonnet 4.5 model '%s', mapping to claude-sonnet-4.5", model)
 			return "claude-sonnet-4.5"
@@ -1780,6 +1790,10 @@ func (e *KiroExecutor) mapModelToKiro(model string) string {
 
 	// Check for Opus variants
 	if strings.Contains(modelLower, "opus") {
+		if strings.Contains(modelLower, "4-6") || strings.Contains(modelLower, "4.6") {
+			log.Debugf("kiro: unknown Opus 4.6 model '%s', mapping to claude-opus-4.6", model)
+			return "claude-opus-4.6"
+		}
 		log.Debugf("kiro: unknown Opus model '%s', mapping to claude-opus-4.5", model)
 		return "claude-opus-4.5"
 	}