Elevated errors for Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5
Claude Status · Resolved
Resolved
Unknown
Oct 23, 2026 23:37 UTC
Oct 24, 2026 00:11 UTC
Timeline
Resolved
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.
Monitoring
We are seeing success rates return to normal for all affected models, and are continuing to monitor to ensure no further issues.
Identified
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.
Investigating
We are investigating elevated errors on requests to Claude Fable 5.1. We will provide an update as soon as possible.