Elevated errors for multiple models

claude.aiClaude API (api.anthropic.com)Claude CodeClaude Cowork

1. 22 Sep 02:35 UTCResolvedThis issue has been resolved. Impact occurred from 5:50pm PT / 00:50 UTC to 7:10pm PT / 02:10 UTC.
2. 22 Sep 02:11 UTCMonitoringWe have seen success rates return to normal across affected models, and are monitoring closely to ensure no further issues.
3. 22 Sep 01:35 UTCUpdateWe 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.
4. 22 Sep 01:17 UTCIdentifiedWe 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.
5. 22 Sep 00:57 UTCInvestigatingWe 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.

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