Update app.py

app.py

@@ -124,7 +124,7 @@ df_sample_routes = pd.DataFrame(sample_data)
 
 # Default engine
 if os.environ.get("OPENAI_API_KEY"):
-    default_engine = create_llm_engine("openai/o1", os.environ.get("OPENAI_API_KEY"))
+    default_engine = create_llm_engine("openai/gpt-4o", os.environ.get("OPENAI_API_KEY"))
 else:
     default_engine = create_llm_engine("Qwen/Qwen2.5-Coder-32B-Instruct")