# Cursor

> Use Claude models inside Cursor through the OpenAI-compatible endpoint, without an Anthropic account.

_Source: https://aiprimetech.io/docs/guides/cursor/ · Home > Docs > Integration guides_

Cursor talks the OpenAI Chat Completions format, so it connects through `/v1/chat/completions` — which means the **`/v1` suffix on the base URL is required**.


## Setup

1. Open **Settings → Models** (or **Cursor Settings → Models** depending on version).
2. Find the OpenAI API section and paste your `sk-` key.
3. Enable **Override OpenAI Base URL** and set it to `https://aiprimetech.io/v1`.
4. Add a custom model name — use an exact id such as `claude-sonnet-4-6`.
5. Click **Verify** / **Save**. Cursor makes a test call; a green result means it is working.

- **Base URL:** `https://aiprimetech.io/v1`
- **API key:** your `sk-` key
- **Model ids:** `claude-sonnet-4-6`, `claude-opus-4-8`, `gpt-5.5`, `gemini-3-pro`
- **Endpoint used:** `/v1/chat/completions`

> Omitting `/v1` is the number-one Cursor setup failure — verification fails with a 404 because Cursor appends only `/chat/completions` to whatever base you give it. See [Base URLs](/docs/getting-started/base-urls/).


## What works and what does not

| Feature | Status |
|---|---|
| Chat with a custom model | Works |
| Inline edit (Ctrl/Cmd+K) | Works |
| Composer / agent mode | Works with models that support tool use |
| Cursor Tab (autocomplete) | Uses Cursor's own in-house model and is unaffected by this setting |

Cursor Tab is not routed through any custom base URL — that is a Cursor product decision, not a gateway limitation.


## If verification fails

- `404` — the `/v1` suffix is missing from the base URL.
- `401` — the key is wrong or has a stray space. Re-copy it from the dashboard.
- Model not found — the custom model name must be an exact id from [Models](/docs/getting-started/models/), not a display name like "Claude Sonnet".
- Verified but replies are empty — see [Troubleshooting](/docs/guides/troubleshooting/).

- [Chat Completions](https://aiprimetech.io/docs/api-reference/chat-completions/) — The endpoint Cursor uses
- [Base URLs](https://aiprimetech.io/docs/getting-started/base-urls/) — The /v1 rule
- [Cline](https://aiprimetech.io/docs/guides/cline/) — The Anthropic-format alternative


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_ClaudeAPIKey.dev is an independently operated, Anthropic-compatible API gateway. Not affiliated with Anthropic._