Cursor IDE

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

Setup

Open Cursor → Settings → Models
Click Add Provider
Set Base URL to https://api2.claudestore.store/v1
Enter your ClaudeStore API Key
Add the model IDs you want to use (e.g., claude-sonnet-4.6)
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-4.6 — Latest flagship, maximum capability (1M context in beta)
claude-sonnet-4.6 — Best balance of speed and capability for coding
claude-opus-4.6 — Previous flagship, still strong for complex problems
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

Install Cursor for Windows from cursor.sh (the installer adds cursor to your PATH automatically).
Open Settings with Ctrl+, → Models.
Toggle OpenAI API Key, paste your sk-cs2-... key.
Toggle Override OpenAI Base URL, set https://api2.claudestore.store/v1.
Click Verify, then add models claude-sonnet-4.6, claude-opus-4.6, claude-haiku-4.5.

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 ClaudeStore.

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