Claude Models Hit by Elevated Errors; Anthropic Identifies Cause

Elevated Errors for Multiple Models

Claude Models Hit by Elevated Errors; Anthropic Identifies Cause

Anthropic is investigating and has identified the cause of elevated errors affecting requests to Claude Mythos 5, Claude Fable 5, Claude Opus 5, and Claude Opus 4.8. The incident impacts claude.ai, the Claude API, Claude Code, and Claude Cowork. A fix is in progress, with updates to follow.

We have identified the cause of elevated errors on requests to Claude Mythos 5, Claude Fable 5, Claude Opus 5, and other Claude models and are working on a fix.
  1. Avicebron

    Hopefully they are fixing fable burning through entire sessions in minutes

  2. bkishan

    Discovered this after couple of hours of being confused.

    In normal chats, Claude desktop doesnt even display API Error: 529. It only does so in Cowork tasks. The regular chat just does an infinite "Clauding" animation.

  3. bradfa

    Contrast with Claude Government with all green 100% uptime. So either no one is using it or the people within Anthropic running that one have different priorities.

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2026-08-24