Update app.py

app.py

@@ -25,7 +25,7 @@ def call_grok(prompt):
     }
 
     payload = {
-        "model": "grok-2-latest",  # fallback: grok-1
+        "model": "grok-4-1-fast-non-reasoning"
         "messages": [
             {"role": "system", "content": "You are a helpful AI assistant."},
             {"role": "user", "content": prompt}