Is the Anthropic API down? Checking Claude API availability

What's happening

Widespread 5xx responses or long time-to-first-token usually mean an upstream incident rather than a bug in your integration.

Fix it

1. Check the official Anthropic status page for an active Messages API incident.
2. Send a minimal curl request to the Messages endpoint with a tiny prompt to isolate your app from the API.
3. Inspect the request id returned in response headers and log it — support will ask for it.
4. Check whether the failure is model-specific by retrying against a different model.
5. Confirm the failure rate across regions or hosts before rolling back a deploy.

Still stuck?

If a minimal curl succeeds while your app fails, the problem is in your client: proxy, timeout, or streaming handling.