Point Cursor at a custom Anthropic base URL

Cursor lets you override the API endpoint it talks to. Once you do, every request is billed against your own key at your own rate instead of Cursor's pooled quota.

Don't have an account yet? You need an API key from the gateway before the steps below will work. Create one free → (no prepay, $1 minimum top-up)

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Quick self-check. Before wiring anything into your app, confirm the key works. This lists every model your account can call — it costs nothing and works from any machine:

curl https://aicomp.ai/v1/models \
  -H "Authorization: Bearer sk-your-gateway-key"

You should get back a JSON list of model IDs. If you see Invalid token, the key is wrong or was not copied in full.

Step 1 — create a key

Step 2 — open the override field

In Cursor: Settings → Models. Look for the base URL override (in some versions it sits under "Override OpenAI Base URL" or the Anthropic section). Enter:

https://aicomp.ai/v1

Then paste your key into the API key field and save.

Step 3 — confirm it took effect

Open a new chat and send a short message. If routing works you get a normal reply. To be certain, check the usage log in your gateway dashboard — the request should appear there within a minute.

If it does not work

Symptom	Fix
Invalid API key	Cursor may cache the old key. Restart Cursor fully after saving.
404 errors	Remove or add the `/v1` suffix so it is not doubled.
Falls back to Cursor quota	Some versions ignore the override unless "use my own key" is explicitly enabled.

What it costs

With your own key, your bill is pure token spend — no per-request markup. Estimate it with the Cursor cost calculator, or compare Sonnet 5 against Haiku 4.5 for your workload.

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