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

Incident Report for Claude

Resolved

The issue affecting Claude Mythos 5 and Claude Fable 5 has been resolved.
Posted Aug 13, 2026 - 16:08 UTC

Update

We are investigating elevated errors on requests to Claude Mythos 5 and Claude Fable 5. We will provide an update as soon as possible.
Posted Aug 13, 2026 - 15:44 UTC

Investigating

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.
Posted Aug 13, 2026 - 14:33 UTC
This incident affected: claude.ai, Claude API (api.anthropic.com), Claude Code, and Claude Cowork.
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