Update agent_service.py

agent_service.py

@@ -282,7 +282,7 @@ Example:
             response_text = ""
             async for message in await client.chat_completion(
                 messages=messages,  # Use messages directly
-                model="meta-llama/Llama-3.3-70B-Instruct",
+                model="openai/gpt-oss-20b",
                 max_tokens=512,
                 temperature=0.7,
                 stream=True