> 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-5.4, GPT-5.4 Mini, and GPT-5.4 Nano are now available

> GPT-5.4, GPT-5.4 Mini, and GPT-5.4 Nano are available in the app and the API.

Three new OpenAI models are now available in the [General Configuration](/general-configuration) AI Model selector and through the external API:

* **GPT-5.4** -- OpenAI's latest flagship model.
* **GPT-5.4 Mini** -- compact variant balancing performance and cost.
* **GPT-5.4 Nano** -- lightweight variant optimized for speed and cost.

You can also set these models via the API when creating or updating an agent:

```json
"agent": {
  "llm": "gpt-5.4"
}
```

| 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 |