Major incident

Anthropic (Claude): Elevated errors for multiple models

Affected: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork

Current status of Anthropic (Claude): Operational — live Anthropic (Claude) status

Timeline

1. Sep 22, 2026, 00:57 UTC
   investigating
   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.
2. Sep 22, 2026, 01:17 UTC
   identified
   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.
3. Sep 22, 2026, 01:35 UTC
   identified
   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.
4. Sep 22, 2026, 02:11 UTC
   monitoring
   We have seen success rates return to normal across affected models, and are monitoring closely to ensure no further issues.
5. Sep 22, 2026, 02:35 UTC
   resolved
   This issue has been resolved. Impact occurred from 5:50pm PT / 00:50 UTC to 7:10pm PT / 02:10 UTC.

Updates as published by Anthropic (Claude) (original).