Claude API outage on Aug 24, 2026: elevated errors for multiple models

Reports during the incident

Every 15 minutes, 04:00 UTC to 09:45 UTC. Grey: normal. Red line: official incident.

04:00 UTC05:06 UTC08:30 UTC09:45 UTC

What people reported

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Anthropic's updates

Quoted from status.claude.com

05:06 UTC
Investigating
We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, Claude Opus 5, and Claude Opus 4.8. We will provide an update as soon as possible.
05:27 UTC
Identified
We have identified the cause of elevated errors on requests to Claude Mythos 5, Claude Fable 5, Claude Opus 5, and other Claude models and are working on a fix. We will provide an update as soon as possible.
06:42 UTC
Identified
We are continuing to work to resolve issues causing elevated requests on multiple models. We will provide an update as soon as possible.
07:47 UTC
Identified
At this time, we have seen errors stabilize on Opus 5 and Fable 5, and are working to fully resolve success rates on all affected models. We will provide an update as soon as possible.
08:30 UTC
Resolved
This issue has been resolved. From 9:50pm PT / 04:50 UTC through 00:36am PT / 07:36 UTC, users saw elevated errors on requests to Claude models, including Claude Opus 5 and Fable 5.

Other Claude API incidents

Nov 8

26 minDegraded performance for Claude Fable 5.1 Details

Oct 27

41 minElevated errors for Claude Sonnet 5.5 Details

Oct 27

42 minElevated errors for Claude Sonnet 5.5 Details

All Claude API incidents

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Anthropic's updates

05:06 UTC

Investigating

We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, Claude Opus 5, and Claude Opus 4.8. We will provide an update as soon as possible.

05:27 UTC

Identified

We have identified the cause of elevated errors on requests to Claude Mythos 5, Claude Fable 5, Claude Opus 5, and other Claude models and are working on a fix. We will provide an update as soon as possible.

06:42 UTC

Identified

We are continuing to work to resolve issues causing elevated requests on multiple models. We will provide an update as soon as possible.

07:47 UTC

Identified

At this time, we have seen errors stabilize on Opus 5 and Fable 5, and are working to fully resolve success rates on all affected models. We will provide an update as soon as possible.

08:30 UTC

Resolved

This issue has been resolved. From 9:50pm PT / 04:50 UTC through 00:36am PT / 07:36 UTC, users saw elevated errors on requests to Claude models, including Claude Opus 5 and Fable 5.