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Anthropic change history: Elevated errors for multiple models

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22Major incident
1Pricing
When (UTC)ChangeKind
Major incident: Elevated errors for multiple models
Anthropic reported a major incident causing elevated request errors across claude.ai, Claude API (api.anthropic.com), Claude Code, and Claude Cowork, initially affecting Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5. Starting 2026-09-03 13:26 UTC, it was resolved at 2026-09-03 16:23 UTC (2 h 57 min); a fix was deployed.
Major incident