Outage in Claude
Elevated errors for multiple models
Resolved MajorIncident Report
Summary AI Generated
On September 22, 2026, Anthropic experienced elevated error rates across Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 for approximately 1.7 hours, affecting both claude.ai and api.anthropic.com. Users encountered server errors, with Claude Opus 5 being the last model to recover after Fable and Mythos returned to normal success rates. The issue was identified and resolved, with all models fully restored by 7:10pm PT.
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.
Components affected
Claude claude.ai Claude api.anthropic.comLatest Updates ( sorted recent to last )
RESOLVED
3 days ago - at 09/22/2026 02:35AM
This issue has been resolved. Impact occurred from 5:50pm PT / 00:50 UTC to 7:10pm PT / 02:10 UTC.
MONITORING
3 days ago - at 09/22/2026 02:11AM
We have seen success rates return to normal across affected models, and are monitoring closely to ensure no further issues.
IDENTIFIED
3 days ago - at 09/22/2026 01:35AM
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.
IDENTIFIED
3 days ago - at 09/22/2026 01:17AM
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.
INVESTIGATING
3 days ago - at 09/22/2026 12:57AM
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.
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