Update app.py

app.py

@@ -5,7 +5,7 @@ from openai import AsyncOpenAI
 
 app = FastAPI()
 
-async def generate_ai_response(prompt: str, model: str = "openai/gpt-4.1-mini"):
+async def generate_ai_response(prompt: str, model: str):
     # Configuration for unofficial GitHub AI endpoint
     token = os.getenv("GITHUB_TOKEN")
     if not token: