Claude AI users reported widespread service issues on Sunday night, with Downdetector showing a sharp rise in complaints involving Claude Code, Claude Chat and the app. Anthropic acknowledged the disruption and said engineers were working to restore normal service.

Users reported problems accessing Claude AI on Downdetector, with Claude Code and Claude Chat accounting for most complaints.

Claude outage hits Mythos 5, Fable 5, Opus 5, and Opus 4.8, affecting Claude.ai, the API, Claude Code, and Cowork.