Cursor
Add PleumRouter in Cursor settings using OpenAI API Key and Override OpenAI Base URL. The Cursor CLI subscription backend is out of scope.
Configuration example. Menu and setting names can differ slightly between Cursor versions.
Setup#
In Cursor Settings > Models, enable OpenAI API Key, paste your plm_ key, set Override OpenAI Base URL to https://apirouter.pleum.ai/v1, and add your model ID.
OpenAI API Key : plm_xxxxxxxxxxxxxxxx
Override OpenAI Base URL : https://apirouter.pleum.ai/v1
Model ID : gpt-5.5Verify#
Send a short prompt. If a reply arrives, the connection works. Look up cost with the X-Request-Id response header at GET /v1/generation?id=….
How it works#
This tool sends OpenAI Chat Completions requests (/v1/chat/completions). The base URL is https://apirouter.pleum.ai/v1 and auth sends your plm_ key as Authorization: Bearer.
Errors#
plm_xxxxxxxxxxxxxxxx in snippets is a dummy. Replace it with a real key from the dashboard's API Keys page. Do not append /chat/completions to the base URL.
| Symptom | Cause and fix |
|---|---|
| 401 Unauthorized | The key is wrong or disabled. Copy the plm_ key again from the dashboard's API keys page, and make sure it is not another service's key. |
| 402 Payment Required | You are out of credits, or the key used up its daily, weekly or monthly budget or its monthly token limit. Top up, or check the budget and limits on your API key. |
| 404 Not Found | The base URL is wrong, or the model ID is not in the catalog. OpenAI-compatible tools end at /v1; Anthropic and Gemini tools take the bare origin without /v1. Do not append paths like /chat/completions yourself. If the error code is model_not_found, check the model ID. |
| 429 Too Many Requests | The key exceeded its per-minute request limit or the concurrent-request limit (concurrency_limit_exceeded), or the model provider's own limit was hit (upstream_rate_limited). Reduce the agent's parallel runs and check Usage limits. |
| model not found | That model ID is not in the catalog. Check the exact ID with GET /v1/models, including case. |
Desktop#
Cursor is already a desktop IDE. In Settings > Models enable OpenAI API Key, set Override OpenAI Base URL to https://apirouter.pleum.ai/v1, and use the same plm_ key. There is no pleum wire file path.
Cost & security tips#
- Set a budget on the key. A coding agent calls the model many times per task and resends long context. Daily, weekly or monthly budgets on your API key make costs easier to predict.
- Keep the key out of git. Make sure a key in your shell profile or config file never gets committed, and if you suspect a leak, revoke it in the dashboard and issue a new one.
- Check where sensitive code goes. Prompts and code are sent to the provider of the model you pick. Use Data residency and PII masking to control that.