Update app.py

app.py

@@ -138,7 +138,7 @@ class BasicAgent:
     # ---- Low‑level LLM call
     def _call_llm(self, prompt: str, max_tokens: int = 256) -> str:
         # List of models to try in order
-        models = ["gpt-4o-mini", "gpt-3.5-turbo", "gpt-4"]
+        models = ["gpt-4.1", "gpt-4o-mini", "gpt-3.5-turbo"]
         
         for model in models:
             try: