Degraded performance for Claude Mythos 5, Claude Fable 5, and Claude Opus 5

Incident Report for Claude

Identified

We have identified the cause of elevated errors on requests to Claude Mythos 5, Claude Fable 5, and Claude Opus 5 and are working on a fix. We will provide an update as soon as possible.
Posted Aug 05, 2026 - 07:05 UTC
This incident affects: claude.ai, Claude API (api.anthropic.com), Claude Code, and Claude Cowork.
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