Update We are continuing to work on a fix for this issue. Posted Sep 03, 2026 - 14:49 UTCUpdate An exhaustive list of affected models: Mythos/Fable 5.1, Mythos/Fable 5, Opus 5, Opus 4.8, Opus 4.6. Posted Sep 03, 2026 - 13:50 UTCIdentified 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. Posted Sep 03, 2026 - 13:41 UTCInvestigating 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.

Posted Sep 03, 2026 - 13:26 UTCThis incident affects: claude.ai, Claude API (api.anthropic.com), Claude Code, and Claude Cowork.