Cursor with 9Coding
Cursor supports custom OpenAI-compatible endpoints. Override the base URL in settings and every model call inside Cursor bills through 9Coding — same models, an order of magnitude off the invoice.
Step 1 · Get a key
Create an API key in the 9Coding console; keys start with sk-9c-. Sign up first if you don't have an account.
Step 2 · Override the base URL
- Open Cursor Settings (⌘+⇧+J / Ctrl+⇧+J) → Models
- In the API Keys section, tick Override OpenAI Base URL
- Enter the address below as the base URL
Override OpenAI Base URL
https://api.9coding.com/v1- Paste your 9Coding key (
sk-9c-…) into the OpenAI API Key field and click Verify
Note: overriding the base URL leaves Cursor's own bundled quota untouched — only calls made with your key bill through 9Coding. The two coexist; whichever entry you pick in the model dropdown decides the route.
Step 3 · Pick a model and verify
Tick the models you want in the list (for example claude-fable-5 or gpt-5.6), send a message in chat, then open the Logs page in the 9Coding console to confirm the call was recorded.
Troubleshooting
- Verify fails — check that the base URL ends in
/v1and the key has no stray whitespace. - Model missing from the list — click Add model and type the model name manually.
- Switching back — untick Override; your settings are kept.