What visitors reported during this incident
No visitor reports were filed for this incident.
Having problems with Anthropic now? Check the current statusAffected services
Updates (7)
- Sep 3, 2026, 04:23 PMElevated errors for multiple models
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.
Anthropic ↗ - Sep 3, 2026, 04:06 PMElevated errors for multiple models
A fix has been deployed for Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 and we are monitoring for recovery.
Anthropic ↗ - Sep 3, 2026, 03:25 PMElevated errors for multiple models
The only affected models right now are Opus 4.8 and Opus 5. The rest of the models have recovered to baseline error rate.
Anthropic ↗ - Sep 3, 2026, 02:49 PMElevated errors for multiple models
We are continuing to work on a fix for this issue.
Anthropic ↗ - Sep 3, 2026, 01:50 PMElevated errors for multiple models
An exhaustive list of affected models: Mythos/Fable 5.1, Mythos/Fable 5, Opus 5, Opus 4.8, Opus 4.6.
Anthropic ↗ - Sep 3, 2026, 01:41 PMElevated errors for multiple models
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.
Anthropic ↗ - Sep 3, 2026, 01:26 PMElevated errors for multiple models
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.
Anthropic ↗
What to do next
- Verify your own services recovered cleanly. Some upstream outages leave queues or caches in a degraded state, run smoke tests before declaring green internally.
- Save the post-mortem. Vendors usually publish a detailed RCA 1-3 days later. We'll add it to this page when it appears.
- Watch the provider going forward. Follow Anthropic's status feed →
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