Anthropic incident

Elevated errors for Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5

Resolved after 1 hour 34 minutes, affecting claude.ai and Claude API (api.anthropic.com) and 1 more, on August 13, 2026.

investigating Aug 13, 2026, 03:44 PM UTC

We are investigating elevated errors on requests to Claude Mythos 5 and Claude Fable 5. We will provide an update as soon as possible.

Started: Aug 13, 2026, 02:33 PM UTC
Resolved: Aug 13, 2026, 04:08 PM UTC
Duration: 1h 34m
Detected by Pingoru: Aug 13, 2026, 02:33 PM UTC

Affected components

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

Update timeline

investigating Aug 13, 2026, 02:33 PM UTC

We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5. We will provide an update as soon as possible.
investigating Aug 13, 2026, 03:44 PM UTC

We are investigating elevated errors on requests to Claude Mythos 5 and Claude Fable 5. We will provide an update as soon as possible.
resolved Aug 13, 2026, 04:08 PM UTC

The issue affecting Claude Mythos 5 and Claude Fable 5 has been resolved.

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