Official Claude API incident · Sep 22, 2026
Major impact Claude API incident on Sep 22, 2026, lasting 1h 38m. Read the official timeline and compare it with community reports from the same day.
Official timeline
We are investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5. We will provide an update as soon as possible.
We have identified the cause of elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 and are working on a fix. We will provide an update as soon as possible.
We are continuing to work to resolve errors affecting some models. At this time, requests to Claude Fable 5 and 5.1 and Mythos 5 and 5.1 have returned to normal success rates. We are working to resolve remaining errors affecting Claude Opus 5, and will provide an additional update shortly.
We have seen success rates return to normal across affected models, and are monitoring closely to ensure no further issues.
This issue has been resolved. Impact occurred from 5:50pm PT / 00:50 UTC to 7:10pm PT / 02:10 UTC.
Official incident details come from Anthropic Status. Community reports are voluntary submissions, not unique users or verified incident attribution. claudedumb.com is independent and not affiliated with Anthropic.