feat: migrate Sonnet 4.5 → Sonnet 4.6 in default mapping and DB

backend/internal/domain/constants.go

@@ -76,11 +76,11 @@ var DefaultAntigravityModelMapping = map[string]string{
 	"claude-opus-4-6":            "claude-opus-4-6-thinking", // 简称映射
 	"claude-opus-4-5-thinking":   "claude-opus-4-6-thinking", // 迁移旧模型
 	"claude-sonnet-4-6":          "claude-sonnet-4-6",
-	"claude-sonnet-4-5":          "claude-sonnet-4-5",
-	"claude-sonnet-4-5-thinking": "claude-sonnet-4-5-thinking",
+	"claude-sonnet-4-5":          "claude-sonnet-4-6",          // Sonnet 4.5 → 4.6
+	"claude-sonnet-4-5-thinking": "claude-sonnet-4-6",          // Sonnet 4.5 → 4.6
 	// Claude 详细版本 ID 映射
 	"claude-opus-4-5-20251101":   "claude-opus-4-6-thinking", // 迁移旧模型
-	"claude-sonnet-4-5-20250929": "claude-sonnet-4-5",
+	"claude-sonnet-4-5-20250929": "claude-sonnet-4-6",          // Sonnet 4.5 → 4.6
 	// Claude Haiku → Sonnet（无 Haiku 支持）
 	"claude-haiku-4-5":          "claude-sonnet-4-6",
 	"claude-haiku-4-5-20251001": "claude-sonnet-4-6",

backend/internal/service/antigravity_gateway_service.go

@@ -977,14 +977,8 @@ func (s *AntigravityGatewayService) getMappedModel(account *Account, requestedMo
 }
 
 // applyThinkingModelSuffix 根据 thinking 配置调整模型名
-// 当映射结果是 claude-sonnet-4-5 且请求开启了 thinking 时，改为 claude-sonnet-4-5-thinking
+// Sonnet 4.5 已统一映射到 4.6，此函数保留为扩展点
 func applyThinkingModelSuffix(mappedModel string, thinkingEnabled bool) string {
-	if !thinkingEnabled {
-		return mappedModel
-	}
-	if mappedModel == "claude-sonnet-4-5" {
-		return "claude-sonnet-4-5-thinking"
-	}
 	return mappedModel
 }
 

backend/internal/service/model_rate_limit_test.go

@@ -181,11 +181,12 @@ func TestIsModelRateLimited_Antigravity_ThinkingAffectsModelKey(t *testing.T) {
 	now := time.Now()
 	future := now.Add(10 * time.Minute).Format(time.RFC3339)
 
+	// Sonnet 4.5 now maps to Sonnet 4.6, so rate limit key is claude-sonnet-4-6
 	account := &Account{
 		Platform: PlatformAntigravity,
 		Extra: map[string]any{
 			modelRateLimitsKey: map[string]any{
-				"claude-sonnet-4-5-thinking": map[string]any{
+				"claude-sonnet-4-6": map[string]any{
 					"rate_limit_reset_at": future,
 				},
 			},
@@ -343,7 +344,7 @@ func TestGetRateLimitRemainingTime(t *testing.T) {
 				Platform: PlatformAntigravity,
 				Extra: map[string]any{
 					modelRateLimitsKey: map[string]any{
-						"claude-sonnet-4-5": map[string]any{
+						"claude-sonnet-4-6": map[string]any{
 							"rate_limit_reset_at": future15m,
 						},
 					},
@@ -359,7 +360,7 @@ func TestGetRateLimitRemainingTime(t *testing.T) {
 				Platform: PlatformAntigravity,
 				Extra: map[string]any{
 					modelRateLimitsKey: map[string]any{
-						"claude-sonnet-4-5": map[string]any{
+						"claude-sonnet-4-6": map[string]any{
 							"rate_limit_reset_at": future5m,
 						},
 					},

backend/migrations/077_rollback_sonnet_to_original.sql

@@ -1,15 +1,13 @@
--- 077: Rollback Sonnet/Haiku mappings from Opus back to original values
--- Reverts migration 077_migrate_sonnet_to_opus46_thinking.sql
--- Restores: Sonnet→Sonnet, Haiku→Sonnet (original behavior)
+-- 077: Migrate Sonnet 4.5 → Sonnet 4.6 for all antigravity accounts
+-- Sonnet 4.5 is no longer reliable on upstream, redirect to 4.6
 
 UPDATE accounts
 SET credentials = jsonb_set(
     credentials, '{model_mapping}',
     (credentials->'model_mapping')
-        || '{"claude-sonnet-4-6": "claude-sonnet-4-6"}'::jsonb
-        || '{"claude-sonnet-4-5": "claude-sonnet-4-5"}'::jsonb
-        || '{"claude-sonnet-4-5-thinking": "claude-sonnet-4-5-thinking"}'::jsonb
-        || '{"claude-sonnet-4-5-20250929": "claude-sonnet-4-5"}'::jsonb
+        || '{"claude-sonnet-4-5": "claude-sonnet-4-6"}'::jsonb
+        || '{"claude-sonnet-4-5-thinking": "claude-sonnet-4-6"}'::jsonb
+        || '{"claude-sonnet-4-5-20250929": "claude-sonnet-4-6"}'::jsonb
         || '{"claude-haiku-4-5": "claude-sonnet-4-6"}'::jsonb
         || '{"claude-haiku-4-5-20251001": "claude-sonnet-4-6"}'::jsonb
 )

frontend/src/composables/useModelWhitelist.ts

@@ -302,10 +302,10 @@ const geminiPresetMappings = [
 // Antigravity 预设映射（支持通配符）
 const antigravityPresetMappings = [
   // Claude 通配符映射
-  { label: 'Claude→Sonnet', from: 'claude-*', to: 'claude-sonnet-4-5', color: 'bg-blue-100 text-blue-700 hover:bg-blue-200 dark:bg-blue-900/30 dark:text-blue-400' },
-  { label: 'Sonnet→Sonnet', from: 'claude-sonnet-*', to: 'claude-sonnet-4-5', color: 'bg-indigo-100 text-indigo-700 hover:bg-indigo-200 dark:bg-indigo-900/30 dark:text-indigo-400' },
+  { label: 'Claude→Sonnet4.6', from: 'claude-*', to: 'claude-sonnet-4-6', color: 'bg-blue-100 text-blue-700 hover:bg-blue-200 dark:bg-blue-900/30 dark:text-blue-400' },
+  { label: 'Sonnet→4.6', from: 'claude-sonnet-*', to: 'claude-sonnet-4-6', color: 'bg-indigo-100 text-indigo-700 hover:bg-indigo-200 dark:bg-indigo-900/30 dark:text-indigo-400' },
   { label: 'Opus→Opus', from: 'claude-opus-*', to: 'claude-opus-4-6-thinking', color: 'bg-purple-100 text-purple-700 hover:bg-purple-200 dark:bg-purple-900/30 dark:text-purple-400' },
-  { label: 'Haiku→Sonnet', from: 'claude-haiku-*', to: 'claude-sonnet-4-5', color: 'bg-emerald-100 text-emerald-700 hover:bg-emerald-200 dark:bg-emerald-900/30 dark:text-emerald-400' },
+  { label: 'Haiku→Sonnet4.6', from: 'claude-haiku-*', to: 'claude-sonnet-4-6', color: 'bg-emerald-100 text-emerald-700 hover:bg-emerald-200 dark:bg-emerald-900/30 dark:text-emerald-400' },
   { label: 'Sonnet4→4.6', from: 'claude-sonnet-4-20250514', to: 'claude-sonnet-4-6', color: 'bg-sky-100 text-sky-700 hover:bg-sky-200 dark:bg-sky-900/30 dark:text-sky-400' },
   { label: 'Sonnet4.5→4.6', from: 'claude-sonnet-4-5-20250929', to: 'claude-sonnet-4-6', color: 'bg-cyan-100 text-cyan-700 hover:bg-cyan-200 dark:bg-cyan-900/30 dark:text-cyan-400' },
   { label: 'Sonnet3.5→4.6', from: 'claude-3-5-sonnet-20241022', to: 'claude-sonnet-4-6', color: 'bg-teal-100 text-teal-700 hover:bg-teal-200 dark:bg-teal-900/30 dark:text-teal-400' },
@@ -326,7 +326,7 @@ const antigravityPresetMappings = [
   { label: '2.5-Flash-Lite透传', from: 'gemini-2.5-flash-lite', to: 'gemini-2.5-flash-lite', color: 'bg-green-100 text-green-700 hover:bg-green-200 dark:bg-green-900/30 dark:text-green-400' },
   // 精确映射
   { label: 'Sonnet 4.6', from: 'claude-sonnet-4-6', to: 'claude-sonnet-4-6', color: 'bg-cyan-100 text-cyan-700 hover:bg-cyan-200 dark:bg-cyan-900/30 dark:text-cyan-400' },
-  { label: 'Sonnet 4.5', from: 'claude-sonnet-4-5', to: 'claude-sonnet-4-5', color: 'bg-cyan-100 text-cyan-700 hover:bg-cyan-200 dark:bg-cyan-900/30 dark:text-cyan-400' },
+  { label: 'Sonnet 4.5→4.6', from: 'claude-sonnet-4-5', to: 'claude-sonnet-4-6', color: 'bg-cyan-100 text-cyan-700 hover:bg-cyan-200 dark:bg-cyan-900/30 dark:text-cyan-400' },
   { label: 'Opus 4.6', from: 'claude-opus-4-6', to: 'claude-opus-4-6-thinking', color: 'bg-pink-100 text-pink-700 hover:bg-pink-200 dark:bg-pink-900/30 dark:text-pink-400' },
   { label: 'Opus 4.6-thinking', from: 'claude-opus-4-6-thinking', to: 'claude-opus-4-6-thinking', color: 'bg-pink-100 text-pink-700 hover:bg-pink-200 dark:bg-pink-900/30 dark:text-pink-400' }
 ]