Cursor IDE

Cursor IDE lets you set your own OpenAI-compatible endpoint, so Claude and GPT models are available through codexkey.

Requirements

• A paid Cursor plan (Pro or higher). Custom endpoints do not work during the trial period.
• A codexkey API key.

Setup

1. In Cursor, open Settings → Models.
2. Turn on OpenAI API Key and paste your codexkey key:
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   sk_cdx_YOUR_KEY

3. Turn on Override OpenAI Base URL and enter:
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   https://api.codexkey.online/v1

4. Click Add Model and type the Cursor model name.

Model names

With a third-party key, Cursor rejects its own model names, so Claude and GPT models have separate names for Cursor. Examples:

The full name table and Cursor limitations: Cursor guide.

Troubleshooting

"Could not connect to custom API"

The base URL must be exactly https://api.codexkey.online/v1: no trailing slash and no /chat/completions. Cursor adds the path itself.

"Invalid API key"

The key must start with sk_cdx_. Keys from other providers will not work.

"Model not found"

Take the name from the table in the Cursor guide. If a model has no separate name, use its ID from GET /v1/models.

Trial plan limitations

The free Cursor trial does not accept custom endpoints. To work with codexkey, upgrade to Cursor Pro.

Slow responses

Autocomplete is fine with a smaller model such as GPT-5.6 Luna (cursorgpt56lun); save the larger models for chat and heavy code generation.