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major✓ Resolved

Elevated errors for multiple models

Anthropic (Claude)•Thu, Sep 3, 2026, 01:26 PM
Status
resolved
Duration
2h 59m
Updates
6
Coverage
0 articles

INCIDENT TIMELINE

✓ ResolvedThu, Sep 3, 2026, 04:25 PM
This incident has been resolved.
monitoringThu, Sep 3, 2026, 04:06 PM
A fix has been deployed for Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 and we are monitoring for recovery.
identifiedThu, Sep 3, 2026, 03:25 PM
The only affected models right now are Opus 4.8 and Opus 5. The rest of the models have recovered to baseline error rate.
identifiedThu, Sep 3, 2026, 02:49 PM
We are continuing to work on a fix for this issue.
identifiedThu, Sep 3, 2026, 01:50 PM
An exhaustive list of affected models: Mythos/Fable 5.1, Mythos/Fable 5, Opus 5, Opus 4.8, Opus 4.6.
identifiedThu, Sep 3, 2026, 01:41 PM
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.
investigatingThu, Sep 3, 2026, 01:26 PM
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.

📊 TECHNICAL DETAILS

Internal ID
1ac18549-b705-4b33-bb1a-af54903bf012
External ID
461yvfrzpwtt
🕐 Started
Thu, Sep 3, 2026, 01:26 PM
🔄 Last Updated
Thu, Sep 3, 2026, 04:25 PM
✓ Resolved
Thu, Sep 3, 2026, 04:25 PM
MAJOR
Impact Level
2h 59m
Total Duration
6
Status Updates
Affected Components
claude.aiClaude API (api.anthropic.com)Claude CodeClaude Cowork
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