diff --git a/backend/internal/service/antigravity_gateway_service.go b/backend/internal/service/antigravity_gateway_service.go
index 5429af17..21c07ec3 100644
--- a/backend/internal/service/antigravity_gateway_service.go
+++ b/backend/internal/service/antigravity_gateway_service.go
@@ -64,9 +64,9 @@ var antigravityPrefixMapping = []struct {
 	// 长前缀优先
 	{"gemini-2.5-flash-image", "gemini-3-pro-image"}, // gemini-2.5-flash-image → 3-pro-image
 	{"gemini-3-pro-image", "gemini-3-pro-image"},     // gemini-3-pro-image-preview 等
-	{"claude-3-5-sonnet", "claude-sonnet-4-5"},   // 旧版 claude-3-5-sonnet-xxx
-	{"claude-sonnet-4-5", "claude-sonnet-4-5"},   // claude-sonnet-4-5-xxx
-	{"claude-haiku-4-5", "claude-sonnet-4-5"},    // claude-haiku-4-5-xxx → sonnet
+	{"claude-3-5-sonnet", "claude-sonnet-4-5"},       // 旧版 claude-3-5-sonnet-xxx
+	{"claude-sonnet-4-5", "claude-sonnet-4-5"},       // claude-sonnet-4-5-xxx
+	{"claude-haiku-4-5", "claude-sonnet-4-5"},        // claude-haiku-4-5-xxx → sonnet
 	{"claude-opus-4-5", "claude-opus-4-5-thinking"},
 	{"claude-3-haiku", "claude-sonnet-4-5"}, // 旧版 claude-3-haiku-xxx → sonnet
 	{"claude-sonnet-4", "claude-sonnet-4-5"},