diff --git a/proxy/internal/service/model_router.go b/proxy/internal/service/model_router.go
index abd96c0..84fd0bc 100644
--- a/proxy/internal/service/model_router.go
+++ b/proxy/internal/service/model_router.go
@@ -102,6 +102,7 @@ func initializeModelProviderMap() map[string]string {
 		"claude-opus-4-1-20250805",
 		"claude-opus-4-20250514",
 		"claude-sonnet-4-20250514",
+		"claude-sonnet-4-5-20250929",
 		"claude-3-7-sonnet-20250219",
 		"claude-3-5-haiku-20241022",
 	}