Use sonnet 4.6 as default in anthropic

Signed-off-by: Djordje Lukic <djordje.lukic@docker.com>

Author: rumpl

pkg/config/auto.go

@@ -54,7 +54,7 @@ func (e *AutoModelFallbackError) Error() string {
 
 var DefaultModels = map[string]string{
 	"openai":         "gpt-5-mini",
-	"anthropic":      "claude-sonnet-4-5",
+	"anthropic":      "claude-sonnet-4-6",
 	"google":         "gemini-2.5-flash",
 	"dmr":            "ai/qwen3:latest",
 	"mistral":        "mistral-small-latest",

pkg/config/auto_test.go

@@ -168,7 +168,7 @@ func TestAutoModelConfig(t *testing.T) {
 				"ANTHROPIC_API_KEY": "test-key",
 			},
 			expectedProvider:  "anthropic",
-			expectedModel:     "claude-sonnet-4-5",
+			expectedModel:     "claude-sonnet-4-6",
 			expectedMaxTokens: 32000,
 		},
 		{
@@ -210,7 +210,7 @@ func TestAutoModelConfig(t *testing.T) {
 			envVars:           map[string]string{},
 			gateway:           "gateway:8080",
 			expectedProvider:  "anthropic",
-			expectedModel:     "claude-sonnet-4-5",
+			expectedModel:     "claude-sonnet-4-6",
 			expectedMaxTokens: 32000,
 		},
 	}