Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

Official status page Resolved

Started

Oct 5, 2026 · 13:05 UTC

Resolved

Oct 5, 2026 · 13:21

Lasted

16 min

Affected components

claude.ai Claude API (api.anthropic.com) Claude Code Claude Cowork

Updates

1. Resolved

   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.

   Oct 5, 2026 · 13:21 UTC
2. Investigating

   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.

   Oct 5, 2026 · 13:05 UTC

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