Elevated errors for multiple models

Summary

Elevated errors for multiple models

This issue has been resolved. Impact occurred from 5:50pm PT / 00:50 UTC to 7:10pm PT / 02:10 UTC.

• Started

  Sep 22, 2026 · 12:57 AM

• Resolved

  Sep 22, 2026 · 2:35 AM

• Duration

  1h 37m

• Severity

  Major

• ◐

  Investigating

  Sep 22 · 12:57 AM Claude

  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.

• ◆

  Identified

  Sep 22 · 1:17 AM Claude

  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.

• ◆

  Identified

  Sep 22 · 1:35 AM Claude

  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.

• ◉

  Monitoring

  Sep 22 · 2:11 AM Claude

  We have seen success rates return to normal across affected models, and are monitoring closely to ensure no further issues.

• ✓

  Resolved

  Sep 22 · 2:35 AM Claude

  This issue has been resolved. Impact occurred from 5:50pm PT / 00:50 UTC to 7:10pm PT / 02:10 UTC.