# Custom Models

> Bring your own weights: fine-tunes and distilled open models run on the same API, infrastructure, and audit trail as the catalog.

Source: https://sference.com/docs/custom-models

Upload your own **Hugging Face** weights and serve them through the same OpenAI-compatible API as the catalog. Fine-tunes and distilled open-weight models run on the same infrastructure, pinned versions, and audit trail as catalog models. **vLLM/SGLang models work out of the box**, and we stand up custom runtimes for models that need them.

Custom model hosting is arranged per customer as part of an enterprise agreement. [Talk to us](mailto:hello@sference.com) with the model and your expected volume.

> **Requested, then provisioned**
>
> Custom models are requested from the [console](https://app.sference.com) and provisioned by Sference. A model moves from **pending** to **available** once it is ready to serve; you call it by the same model id you registered.

## Register a model

1. In the [console](https://app.sference.com), open **Custom Models** and choose **Add model**.
2. Enter the **Hugging Face model id** (for example `your-org/your-finetune`) and its **architecture** (the base family it derives from, e.g. Qwen or Llama).
3. If the repository is **private**, mark it as such so we can arrange access.
4. Submit. The model appears with status **pending** while we provision it, then flips to **available**.

> **Access to private repos**
>
> For a private Hugging Face repository, grant Sference read access (or share a scoped token) so the weights can be pulled. Public repositories need no extra step.

## Call your model

Once the model is **available**, use it exactly like a catalog model: same endpoints, same request shape, same [pinned-version](https://sference.com/docs/models) guarantees. Reference it by the model id you registered:

```bash
sference responses create \
  --model "your-org/your-finetune" \
  --content "Summarize this contract in three bullet points." \
  --wait
```

You can also open it in the **playground** from the console, or route production traffic to it through a dedicated [deployment](https://sference.com/docs/deployments).

## Billing

Hosting and per-token rates for custom models are agreed per customer as part of an enterprise agreement, not published as a rate card. Pricing depends on the model, the hardware it needs, and your volume. Every request carries the same request-level logging and audit trail as catalog traffic.

## Next steps

- [Deployments](https://sference.com/docs/deployments): Give a custom model dedicated capacity with a performance tier.
- [Models](https://sference.com/docs/models): How the catalog, pinned versions, and size classes work.
- [Quickstart](https://sference.com/docs/quickstart): API key, CLI install, and your first request.