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Cursor offers an Override OpenAI Base URL setting for supported local Chat and Agent requests. Cursor staff describe request-format limitations with custom OpenAI-compatible gateways. Treat this route as a compatibility check for your Cursor version and chosen model.

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Configure the override

  1. Create a z_sk_ key in the developer console.
  2. Open Cursor Settings → Models. Enter the key in the OpenAI API key field and set Override OpenAI Base URL to https://app.trynito.ai/v1.
  3. Add or select a model ID that Cursor accepts and that appears in the Nito catalog. Send a short prompt in a local Chat session.
The override is global for Cursor’s OpenAI route. It does not give each custom model a separate URL or key. Cursor’s Tab completion and hosted agents continue using Cursor’s own models. Test both a short text reply and a small Agent task before using the route for work.

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Known limits

Cursor may reject a model ID, especially one that collides with a built-in model, or send a request shape that the Nito endpoint cannot accept. A 400 response mentioning missing messages after Cursor sends input indicates this request-format problem. Changing the model name does not repair that mismatch. Cursor’s support team says custom gateways are not fully supported through this override. If the check fails, OpenCode and Cline have explicit custom provider configuration. You can continue using Cursor as your editor while running one of those tools separately. See Cursor’s API key settings for its supported BYOK scope.