# Jan

[Jan](https://jan.ai/) is an open-source ChatGPT alternative. It supports `transformers serve` natively without extra tunneling.

Go to **Settings > Model Providers**.

1. Set **Base URL** to http://localhost:8000/v1.
2. Enter any text in **API Key** (required).

Check the **Models** section (click **Refresh** if empty). Click **+** to add a specific model like Qwen/Qwen3-4B.