Anthropic incident

Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

Major Resolved View vendor source →

Anthropic experienced a major incident on October 5, 2026 affecting claude.ai and Claude API (api.anthropic.com) and 1 more component, lasting 15m. The incident has been resolved; the full update timeline is below.

Started
Oct 05, 2026, 01:05 PM UTC
Resolved
Oct 05, 2026, 01:21 PM UTC
Duration
15m
Detected by Pingoru
Oct 05, 2026, 01:05 PM UTC

Affected components

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

Update timeline

  1. investigating Oct 05, 2026, 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.

  2. resolved Oct 05, 2026, 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.