Elevated errors for multiple models

resolved

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

9/22/2026, 2:35:23 AM

monitoring

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

9/22/2026, 2:11:43 AM

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.

9/22/2026, 1:35:46 AM

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.

9/22/2026, 1:17:32 AM

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.

9/22/2026, 12:57:26 AM