> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sideren.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Cursor on Sideren.

> Cursor's models settings accept an OpenAI-compatible override — point the OpenAI base URL at the gateway, paste your key, and add Sideren model ids.

## Configure

In `Cursor Settings → Models`:

* Enable **Override OpenAI Base URL** and set it to:

```
https://api.sideren.io/v1
```

* Paste your `sdn_` key into the **OpenAI API Key** field.
* Under model names, add a **custom model** for each catalog id you want to use — e.g.
  `@sdn/gpt-oss-120b`, `@sdn/glm-5.3`, `@sdn/deepseek-v4-pro`.
* Click **Verify** — Cursor sends a probe to `/v1/chat/completions` and should turn green.

## Troubleshooting

* **Verify fails?** The base URL must end in `/v1` and at least one custom model name must
  be a valid [catalog id](/models) — Cursor verifies with the model currently selected.
* **Model "not found"?** Model names are exact — `@sdn/glm-5.3`, not `glm 5.3` or `GLM-5.3-Turbo`.
  Copy ids from the catalog page (older spellings such as `sdn-glm-5.3` and `glm-5.3` also work).
* **Built-in models stopped working?** Expected: overriding the OpenAI base URL points
  Cursor's OpenAI slot at Sideren. Toggle the override off to switch back.

<Note>
  Cursor uses its own accounts for some built-in features; the override governs the
  chat/composer models you add by name. A model you add has to be in your plan
  ([Plans & limits](/plans#model-access-by-plan)), or run in PAYG mode.
</Note>

## Cursor CLI (`agent`)

Cursor Agent CLI (`agent` / `cursor agent`) does **not** support BYOK or a custom
OpenAI-compatible base URL — it only talks to Cursor Cloud under your Cursor account.
There is no config file the setup helper can write.

```sh theme={null}
npx sideren setup --tool cursor-cli --key sdn_your_key
```

prints the IDE override above and a one-liner for a terminal agent Sideren **can**
configure (`hermes`, `codex`, `claude-code`).


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