Cursor

Set up Cursor on this machine to use RouterPlex, an OpenAI- and Anthropic-compatible AI gateway. Keep working until a real request from Cursor succeeds through RouterPlex.
 
My RouterPlex API key: YOUR_ROUTERPLEX_API_KEY
 
Key handling:
- If the key line above is a placeholder rather than a real key (real keys start with sk-), use my ROUTERPLEX_API_KEY environment variable. If that is empty too, ask me for the key once, then continue.
- Store the key only in user-level config or my user environment. Never put it in a project file, never commit it, and do not repeat the full key in your replies.
 
Full guide: https://docs.routerplex.com/cursor
 
Step 1. Prove the key and the RouterPlex gateway work before changing anything else. Run:
   curl -sS https://api.routerplex.com/v1/chat/completions -H "Authorization: Bearer YOUR_ROUTERPLEX_API_KEY" -H "Content-Type: application/json" -d '{"model":"claude-sonnet-4-6","max_tokens":32,"messages":[{"role":"user","content":"Reply with exactly: RouterPlex connected."}]}'
   On Windows PowerShell, use curl.exe with the body in a file, or Invoke-RestMethod.
   - A reply containing "RouterPlex connected.": go on.
   - 401: the key is wrong or revoked. Stop and ask me for a correct key.
   - 402: my balance or trial credit is used up. 403: this key reached its own spending limit. Stop and tell me; retrying cannot fix these.
   - Network, DNS, TLS, or proxy errors: find and fix the cause (proxy variables, VPN, firewall, system clock, outdated CA certificates), then run it again.
 
Step 2. Configure Cursor:
   - Cursor keeps these settings in its own app storage, so I have to enter them. Tell me to open Cursor Settings → Models, then:
     OpenAI API Key: <key>
     Override OpenAI Base URL: https://api.routerplex.com/v1   (turn the override on)
     Add model: claude-sonnet-4-6   (exact ID), then select it in a new chat
   - Cursor Tab and Cursor's bundled models always use Cursor's own servers; only the custom model goes through RouterPlex.
 
Step 3. Test Cursor itself from a new terminal or a restarted app, so you test the saved setup rather than the shell you changed:
   Ask me to send this in a new chat with the custom claude-sonnet-4-6 model selected, and report the reply: Reply with exactly: RouterPlex connected.
   If Cursor rejects the model, check that I updated Cursor, that the override is on, and that the custom model (not a bundled one) is selected.
   Expected reply: "RouterPlex connected."
 
Step 4. If step 1 works but step 3 fails, the problem is Cursor's configuration or environment, not RouterPlex. Check these, fix what is wrong, and repeat step 3:
   - The key or base URL is set in one place but not where Cursor starts: zsh vs bash startup files, login vs non-login shells, a desktop launcher, a background service, Windows vs WSL, or a remote SSH or container environment.
   - Another setting wins: OPENAI_API_KEY, OPENAI_BASE_URL, OPENAI_API_BASE, ANTHROPIC_API_KEY, ANTHROPIC_BASE_URL, or a project-level config that overrides the user-level one.
   - Cursor is outdated, or still needs a full restart to read the new settings.
   - If an environment variable cannot be made to reach Cursor reliably and Cursor accepts a key in its user-level config, put the key there instead.
 
Keep repeating steps 3 and 4 until the test reply comes back. Stop early only for a 401, 402, or 403, or for a step only I can do, such as a click in a settings window or a login. Then tell me exactly what to do, wait for me, and continue testing afterwards.
 
When it works, tell me which files you changed, where the key is stored, and the final test output.

OpenAI API Key: YOUR_ROUTERPLEX_API_KEY
Override OpenAI Base URL: https://api.routerplex.com/v1
Custom model: claude-sonnet-4-6