Outage in Anthropic
Elevated errors for multiple models
Resolved MajorIncident Report
Summary AI Generated
Anthropic experienced elevated error rates across multiple Claude models — including Claude Mythos 5, Claude Fable 5, Claude Opus 5, and Claude Opus 4.8 — affecting both claude.ai and the API for approximately 3.4 hours. Users encountered 529 Overloaded errors during the outage. The issue was identified and resolved, with full service restored by 12:36am PT on August 24, 2026.
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.
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Latest Updates ( sorted recent to last )
RESOLVED
2 days ago - at 08/24/2026 08:30AM
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.
IDENTIFIED
2 days ago - at 08/24/2026 07:47AM
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.
IDENTIFIED
2 days ago - at 08/24/2026 06:42AM
We are continuing to work to resolve issues causing elevated requests on multiple models. We will provide an update as soon as possible.
IDENTIFIED
2 days ago - at 08/24/2026 05:27AM
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.
INVESTIGATING
2 days ago - at 08/24/2026 05:06AM
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.
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