Sep 3, 16:23 UTC
Resolved - The issue affecting Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 has been resolved. Impact has ended as of 9:16 PT / 16:16 UTC.

Sep 3, 16:06 UTC
Monitoring - A fix has been deployed for Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 and we are monitoring for recovery.

Sep 3, 15:25 UTC
Update - The only affected models right now are Opus 4.8 and Opus 5. The rest of the models have recovered to baseline error rate.

Sep 3, 14:49 UTC
Update - We are continuing to work on a fix for this issue.

Sep 3, 13:50 UTC
Update - An exhaustive list of affected models: Mythos/Fable 5.1, Mythos/Fable 5, Opus 5, Opus 4.8, Opus 4.6.

Sep 3, 13:41 UTC
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.

Sep 3, 13:26 UTC
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.

Sep 3, 12:56 UTC
Resolved - This incident has been resolved.

Sep 3, 12:47 UTC
Monitoring - A fix has been implemented and we are monitoring the results.

Sep 3, 12:37 UTC
Investigating - We are investigating elevated errors on requests to Claude Sonnet 5. We will provide an update as soon as possible.

Sep 2, 21:44 UTC
Resolved - The issue affecting Claude Sonnet 5 has been resolved. Impact occurred from 2:05pm PT / 21:05 UTC to 2:19pm PT / 21:19 UTC.

Sep 2, 21:17 UTC
Investigating - We are investigating elevated errors on requests to Claude Sonnet 5. We will provide an update as soon as possible.