Elevated errors for multiple models

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

1. 3 Sep 16:23 UTCResolvedThe issue affecting Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 has been resolved. Impact has ended as of 9:16 PT / 16:16 UTC.
2. 3 Sep 16:06 UTCMonitoringA fix has been deployed for Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 and we are monitoring for recovery.
3. 3 Sep 15:25 UTCUpdateThe only affected models right now are Opus 4.8 and Opus 5. The rest of the models have recovered to baseline error rate.
4. 3 Sep 14:49 UTCUpdateWe are continuing to work on a fix for this issue.
5. 3 Sep 13:50 UTCUpdateAn exhaustive list of affected models: Mythos/Fable 5.1, Mythos/Fable 5, Opus 5, Opus 4.8, Opus 4.6.
6. 3 Sep 13:41 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.
7. 3 Sep 13:26 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.

No field changes in the recorded history.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

A day selects the latest observation by the end of that UTC day; today's selection can change until midnight. History starts when this installation records it.

• Service status now: every provider ChangeIntel reads, with ongoing incidents first.
• Status RSS feed: new and ended incidents as they happen.
• Everything about Anthropic Claude: its changes, known issues and incidents on one timeline.