Update app.py

app.py

@@ -40,7 +40,7 @@ Explain why this is the best recipient in 2-3 lines.
     for attempt in range(3):
         try:
             response = client.chat.completions.create(
-                model="llama-2-7b-chat",  # smaller model for Spaces
+                model="llama-3.3-70b-versatile",  # smaller model for Spaces
                 messages=[{"role": "user", "content": prompt}]
             )
             explanation = response.choices[0].message.content