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

## Updated supported LLM models

The list of available AI models has been updated. New models have been added and GPT-4o has been removed.

**New models:**

| Model          | Description                                                 |
| -------------- | ----------------------------------------------------------- |
| `gpt-4.1-nano` | Lightweight variant of GPT-4.1 optimized for speed and cost |
| `gpt-5-mini`   | Compact GPT-5 variant balancing performance and cost        |
| `gpt-5-nano`   | Lightweight GPT-5 variant optimized for speed and cost      |
| `synthflow`    | Optimized for real-time, natural phone conversations        |

**Updated endpoints:**

| 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 |