Is Anthropic (Claude) down?

Understanding Anthropic and Claude availability

Anthropic provides Claude through its consumer web experience at claude.ai and through the developer API at api.anthropic.com. These access paths can fail independently: Claude’s web interface may be unavailable while API requests work, or an API integration may fail while the website remains accessible.

A status result of Up means the monitored service responded at the time of the check. It does not confirm that every model request, account, organization, region, browser session, or API credential is working normally. Compare the result with Anthropic’s official status page for incident and maintenance updates.

What common API responses can indicate

• HTTP 529: The API is overloaded and may temporarily reject requests. The endpoint can remain reachable while requests fail.
• HTTP 500: An internal server-side failure occurred while processing the request.
• HTTP 503: The service or an upstream component is temporarily unavailable.
• HTTP 504 or a timeout: The request did not receive a response within the expected time. The cause may be service-side, network-related, or specific to the application’s timeout settings.

Slower token generation, repeated retries, or intermittent failures can indicate degraded API performance rather than a complete outage.

Troubleshooting Anthropic Claude and API failures

First, determine the scope

Check this page and compare the result with Anthropic’s official status page. Record the exact time, endpoint, HTTP status, and whether the failure affects Claude at claude.ai, the API, or both. A reported incident makes a service-side cause more likely; a failure limited to one account, request, or network points elsewhere.

API overload or server errors

• HTTP 529: Reduce concurrency where possible and retry with exponential backoff and jitter. Set a maximum retry count or time window so an overload does not become an uncontrolled retry loop.
• HTTP 500: Capture the response details and request time, then retry conservatively. Persistent 500 responses across different requests are more consistent with a server-side or request-processing problem than a browser issue.
• HTTP 503: Check the official status page and retry after a delay. Changing browsers will not usually resolve an API-side 503.
• HTTP 504 or a timeout: Check the application timeout, upstream proxy, network path, and service status. Do not assume that increasing the timeout alone will fix a connection or service problem.

The status check says Up, but your integration fails

Check the API key, organization or project routing, account credits or capacity, model and request configuration, and the application’s timeout settings. Confirm that the request is sent to api.anthropic.com and that the client is not applying an invalid proxy, certificate, or DNS configuration. Log the HTTP status and response body without exposing API keys.

Claude works in the browser, but the API client fails

The problem is more likely to be local to the integration: credentials, authorization, request formatting, SDK or client configuration, rate handling, proxy settings, or firewall rules. Test a minimal request using the same account and organization context, and compare its response with the failing request.

Claude at claude.ai does not load

Try a private browser window, disable extensions that modify page requests, and sign in again. If other sites also fail, test another network or DNS path. A browser-only failure with a normal official status page is more likely to involve the session, browser, account access, or local network than a general Anthropic outage.

Connection, DNS, or TLS failures

Test whether the hostname resolves and whether your network, proxy, firewall, or TLS inspection is blocking the connection. Compare one request from a different network if possible. If failures occur only from one environment, provide the network, endpoint, timestamp, and error details when escalating rather than repeatedly increasing retries.