Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

Official Claude incident record with affected components, status, timeline updates, and links back to relevant status checks.

Affected components

These are the official Claude components attached to this incident. Component data can help separate a web app issue from an API, Console, or Claude Code issue.

claude.aiClaude API (api.anthropic.com)Claude CodeClaude Cowork

Official timeline

Updates are shown from the official Claude status incident record.

resolvedOct 5, 01:21 PM UTC

The issue affecting Claude Mythos 5.1 and Claude Fable 5.1 has been resolved. Impact occurred from 05:40 PT / 12:40 UTC to 06:10 PT / 13:10 UTC.

investigatingOct 5, 01:05 PM UTC

We are investigating elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1. We will provide an update as soon as possible.