Elevated errors for Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5

Timeline

1. 24 Oct · 00:11 UTC 🟡 Resolved atom

   Oct 24, 00:11 UTC
   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.
   
   Oct 23, 23:54 UTC
   Monitoring - We are seeing success rates return to normal for all affected models, and are continuing to monitor to ensure no further issues.
   
   Oct 23, 23:39 UTC
   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.
   
   Oct 23, 23:37 UTC
   Investigating - We are investigating elevated errors on requests to Claude Fable 5.1. We will provide an update as soon as possible.

2. 23 Oct · 23:54 UTC 🟡 Monitoring atom

   Oct 23, 23:54 UTC
   Monitoring - We are seeing success rates return to normal for all affected models, and are continuing to monitor to ensure no further issues.
   
   Oct 23, 23:39 UTC
   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.
   
   Oct 23, 23:37 UTC
   Investigating - We are investigating elevated errors on requests to Claude Fable 5.1. We will provide an update as soon as possible.

3. 23 Oct · 23:39 UTC 🟡 Identified atom

   Oct 23, 23:39 UTC
   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.
   
   Oct 23, 23:37 UTC
   Investigating - We are investigating elevated errors on requests to Claude Fable 5.1. We will provide an update as soon as possible.

4. 23 Oct · 23:37 UTC 🟡 Investigating atom

   Oct 23, 23:37 UTC
   Investigating - We are investigating elevated errors on requests to Claude Fable 5.1. We will provide an update as soon as possible.