CursorNovember 6, 20262 min read

How to use Claude in Cursor with your own key

Cursor can run on your own API key instead of a subscription. You only need to set the address and the key in the model settings.

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In short

Open Cursor Settings → Models, paste your KLINCH key into OpenAI API Key, turn on Override OpenAI Base URL with https://api.klinch.cloud/v1 and add the model claude-sonnet-5-5. After Verify, Claude shows up in Cursor’s chat and agent.

Setup step by step

Open Cursor Settings and go to Models.
Under API Keys turn on OpenAI API Key and paste kl_live_….
Turn on Override OpenAI Base URL and paste https://api.klinch.cloud/v1.
Click Add model and type claude-sonnet-5-5. You can also add claude-opus-5-5, gpt-6.1-sol or deepseek-v4-pro.
Click Verify and pick the model in the chat.

If Verify fails

What you see	What to do
Invalid API key	Copy the key again with the copy button, no spaces.
404 or Model not found	The address must end with `/v1`, and the model name must have no spaces.
The answer comes from another model	Turn off Cursor’s built-in models and keep only the ones you added.

What the key pays for

Chat and agent requests to the models you added are charged to your KLINCH balance. Some Cursor features, such as Tab completion, only run on Cursor’s own models.