Anthropic incident
Elevated errors for Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5
Resolved after 33 minutes, affecting claude.ai and Claude API (api.anthropic.com) and 1 more, on October 23, 2026.
The issue affecting Claude models has been resolved. Impact occurred from 16:28 PT / 23:28 UTC on October 23 to 16:59 PT / 23:59 UTC on October 23.
Affected components
Update timeline
- investigating Oct 23, 2026, 11:37 PM UTC
We are investigating elevated errors on requests to Claude Fable 5.1. We will provide an update as soon as possible.
- identified Oct 23, 2026, 11:39 PM UTC
We have identified the cause of elevated errors on requests to Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5, as well as fast mode requests to Opus 5.5 and are working on a fix. We will provide an update as soon as possible.
- monitoring Oct 23, 2026, 11:54 PM UTC
We are seeing success rates return to normal for all affected models, and are continuing to monitor to ensure no further issues.
- resolved Oct 24, 2026, 12:11 AM UTC
The issue affecting Claude models has been resolved. Impact occurred from 16:28 PT / 23:28 UTC on October 23 to 16:59 PT / 23:59 UTC on October 23.
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