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major✓ Resolved

Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

Anthropic (Claude)•Fri, Sep 11, 2026, 02:19 PM
Status
resolved
Duration
20 minutes
Updates
4
Coverage
0 articles

INCIDENT TIMELINE

✓ ResolvedFri, Sep 11, 2026, 02:40 PM
This incident has been resolved.
monitoringFri, Sep 11, 2026, 02:28 PM
A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.
monitoringFri, Sep 11, 2026, 02:28 PM
A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring for recovery.
identifiedFri, Sep 11, 2026, 02:21 PM
We have identified the cause of elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1 and are working on a fix. We will provide an update as soon as possible.
investigatingFri, Sep 11, 2026, 02:19 PM
We are investigating elevated errors on requests to Claude Fable 5.1 and Claude Mythos 5.1. We will provide an update as soon as possible.

📊 TECHNICAL DETAILS

Internal ID
1b3f6114-65c0-47fc-9c07-ab5c992f6304
External ID
t33dncr5ydvl
🕐 Started
Fri, Sep 11, 2026, 02:19 PM
🔄 Last Updated
Fri, Sep 11, 2026, 02:40 PM
✓ Resolved
Fri, Sep 11, 2026, 02:40 PM
MAJOR
Impact Level
20 minutes
Total Duration
4
Status Updates
Affected Components
claude.aiClaude API (api.anthropic.com)Claude CodeClaude Cowork
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