> For a complete page index, fetch https://docs.synthflow.ai/llms.txt. For full documentation content, fetch https://docs.synthflow.ai/llms-full.txt.

## GPT-5.1 is now supported

Added GPT-5.1 support for agents.

| Endpoint                                                                              | Title           |
| ------------------------------------------------------------------------------------- | --------------- |
| [**POST /assistants**](/api-reference/platform-api/agents/create-assistant)           | Create an agent |
| [**PUT /assistants/:model\_id**](/api-reference/platform-api/agents/update-assistant) | Update an agent |

```curl
"agent": {
   "llm": "gpt-5.1"
 }
```