The Claude API is operational
Anthropic reports api.anthropic.com operational. A failing request while this is green is most likely your key, rate limit, or payload — check the error code below.
Elevated errors for Claude Opus 4.8
A fix has been implemented and we are monitoring the results.
View Incident Detailarrow_forwardWe’ve suspended access to Claude Mythos 5 and Claude Fable 5
Learn more here: https://anthropic.com/news/fable-mythos-access
View Incident Detailarrow_forwardComponent Status
Claude API (api.anthropic.com)
Backend Systems
Operational
Anthropic API error codes — you vs Anthropic
The HTTP status tells you instantly whether to fix your request or wait it out. Only 500 and 529 mean the problem is on Anthropic's side.
| Code | Type | Whose side | What to do |
|---|---|---|---|
| 400 | invalid_request_error | You | Malformed request. Fix the payload — retrying will not help. |
| 401 | authentication_error | You | Missing or invalid API key. |
| 403 | permission_error | You | Key lacks access to that model or resource. |
| 429 | rate_limit_error | You | Rate or token limit hit. Back off and lower concurrency. |
| 500 | api_error | Anthropic | Unexpected server error. Retry with backoff. |
| 529 | overloaded_error | Anthropic | API at capacity. Retry with exponential backoff. |
Claude API status — FAQ
Is the Claude API (api.anthropic.com) down right now? expand_more
Read the banner at the top of this page — it is driven by Anthropic's own Claude API component on the public status page. Red means a confirmed API outage, amber means degraded performance, green means operational. If it is green but your requests fail, check the HTTP status code: 4xx is almost always your request, 5xx/529 is Anthropic's side.
What's the difference between 'Anthropic status' and 'Claude API status'? expand_more
Anthropic publishes one status page (status.claude.com) covering several components — claude.ai, the Claude API (api.anthropic.com), Claude Code, and others. 'Claude API status' is specifically the api.anthropic.com component, which is what this page focuses on. The overall 'Anthropic status' can be red because of a different component while the API itself is fine.
Is a 529 error an API outage? expand_more
Not exactly. A 529 (overloaded_error) means the API is temporarily at capacity, not fully down. It is on Anthropic's side and the fix is to retry with exponential backoff or shift load to a lighter model — but the component can still read 'operational' during short-lived 529 spikes.
My API calls fail but the page is green — why? expand_more
When this page shows the API operational, a failing call is most likely a 400/401/403/429 — a problem with your request, key, permissions, or rate limit, not an Anthropic outage. Check the error-code table above; only 500 and 529 indicate Anthropic's side.