Claude Mythos 5.1, Fable 5.1 and Opus 5 hit elevated errors, Anthropic investigating

ClaudeAI-mod-bot · reddit · 2026-09-03

Anthropic's status page reports elevated error rates for Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 starting Sep 3, 13:26 UTC. The incident is under investigation; the subreddit discussion hub tracks updates from status.claude.com and will be removed an hour after resolution.

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