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Cursor IDE

Set up Claude API in Cursor IDE — step-by-step configuration for Claude Sonnet, Opus, and Haiku models in Cursor.

Setup

  1. Open Cursor → Settings → Models
  2. Click Add Provider
  3. Set Base URL to https://api.llmsrelay.com/v1
  4. Enter your LLMsRelay API Key
  5. Add the model IDs you want to use (e.g., claude-sonnet-4.6)
  6. Select the model from the model picker in the chat panel
Cursor uses the OpenAI-compatible endpoint. The base URL must include /v1.

Recommended Models

  • claude-opus-5 / claude-fable-5 — highest-capability options for complex tasks
  • claude-opus-4.8 / claude-opus-4.7 — long coding and reasoning sessions
  • claude-sonnet-5 / claude-sonnet-4.6 — balanced coding defaults
  • claude-haiku-4.5 — Fastest, ideal for autocomplete

Troubleshooting

  • Ensure the base URL ends with /v1
  • Verify your API key is correct and has sufficient credits
  • Check that the model ID matches exactly (e.g., claude-sonnet-4.6, not claude-3-sonnet)

Windows setup

  1. Install Cursor for Windows from cursor.sh (the installer adds cursor to your PATH automatically).
  2. Open Settings with Ctrl+, → Models.
  3. Toggle OpenAI API Key, paste your sk-cs4-... key.
  4. Toggle Override OpenAI Base URL, set https://api.llmsrelay.com/v1.
  5. Click Verify, then add model IDs returned by GET /v1/models.
Cursor stores its config under %APPDATA%\Cursor. After changing keys, fully quit Cursor (Task Manager → end Cursor.exe) before reopening — the settings cache is aggressive.

Behind a corporate proxy? Set Windows-wide proxy via setx HTTPS_PROXY "http://proxy.company:8080" in PowerShell, then restart Cursor.

Tab completion uses Cursor's own model and is not affected by these settings — only Chat / Composer / Agent route through LLMsRelay.

Ready to start?

Create a key and configure a compatible API route in under 2 minutes.

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