Updated 8:11 p.m. Eastern on October 23, 2026
Claude says the issue causing elevated errors on model requests has been resolved, with impact occurring between 23:28 and 23:59 UTC on October 23.
What is affected
Elevated errors affected requests to Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5, along with fast mode requests to Opus 5.5.
Official update timeline
We are investigating elevated errors on requests to Claude Fable 5.1. We will provide an update as soon as possible.
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.
We are seeing success rates return to normal for all affected models, and are continuing to monitor to ensure no further issues.
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.
