Cursor IDE
Cursor IDE supports custom OpenAI-compatible endpoints, making it easy to use Claude models through Claudexia.
Requirements
- Cursor Pro plan — the trial plan does not support custom API endpoints. You must have an active Pro subscription.
- A Claudexia API key.
Setup
- Open Cursor and go to Settings → Models.
- Set the OpenAI API Key to your Claudexia key:text
sk_cdx_YOUR_KEY - Set the Override OpenAI Base URL to:text
https://api.claudexia.tech/v1 - Click Add Model and add the model IDs you want to use.
Model IDs
Add these model IDs in Cursor's model settings:
| Model ID | Description |
|---|---|
claude-sonnet-4.5 | Claude Sonnet 4 — balanced speed and intelligence. |
claude-haiku-4.5 | Claude 3.5 Haiku — fast and cost-effective. |
claude-3-5-sonnet-20241022 | Claude 3.5 Sonnet — previous generation. |
Check Models for the full list of available model IDs.
Troubleshooting
"Could not connect to custom API"
Ensure the base URL is exactly https://api.claudexia.tech/v1 — no trailing slash, no /chat/completions suffix. Cursor appends the path automatically.
"Invalid API key"
Verify your key starts with sk_cdx_. Keys from other providers will not work.
"Model not found"
Make sure the model ID you added matches exactly. Use GET /v1/models to see available IDs.
Trial plan limitations
Cursor's free trial does not allow custom API endpoints. Upgrade to Cursor Pro to use Claudexia as a backend.
Slow responses
If responses are slow, try a smaller model like claude-3-5-haiku-20241022 for autocomplete tasks, and reserve larger models for chat and complex code generation.