diff --git a/lib/ai/model-runtime.ts b/lib/ai/model-runtime.ts
index 69d4bcef9..374105cf0 100644
--- a/lib/ai/model-runtime.ts
+++ b/lib/ai/model-runtime.ts
@@ -8,15 +8,6 @@ interface ResolveModelRuntimeIdOptions {
   providerType?: string | null;
 }
 
-function fallbackRuxaRuntimeId(modelId: string) {
-  if (!modelId.startsWith("google/")) {
-    return modelId;
-  }
-
-  const candidate = modelId.slice("google/".length).trim();
-  return candidate || modelId;
-}
-
 function toRecord(value: unknown): Record<string, unknown> | null {
   if (typeof value !== "object" || value === null || Array.isArray(value)) {
     return null;
@@ -46,9 +37,5 @@ export function resolveModelRuntimeId(
   }
 
   const resolvedModelId = normalizeRuntimeModelId(model?.modelId) || "";
-  if (options?.providerType === "ruxa-image") {
-    return fallbackRuxaRuntimeId(resolvedModelId);
-  }
-
   return resolvedModelId;
 }