Claude

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Elevated errors for multiple models

Updated 22 Sep 2026, 04:39 UTC

Resolved 00:57Started 2Timeline events

Confirmed by the official source.

Executive summary

Summary
Claude officially reported elevated errors affecting requests to multiple models and several Claude components. Success rates later returned to normal, and the incident is being monitored.

What users experienced

User impact
Requests to Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 experienced elevated errors. Claude.ai, the Claude API, Claude Code, and Claude Cowork were reported as partially disrupted during the incident.

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Started

00:5722 Sep 2026

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Timeline events

Timeline of the incident

22 Sep 2026, 01:02 UTC
Detection
Confirmed by an official service source.
22 Sep 2026, 04:39 UTC
Resolution
The service is no longer reporting this incident as active.

What we know

✓The incident affected Claude.ai, the Claude API, Claude Code, and Claude Cowork.
✓Claude reported that Fable and Mythos requests returned to normal before addressing remaining Opus errors.
✓Claude later reported normal success rates across affected models and began monitoring for further issues.