Users experienced partial outages and performance downgrades with Claude AI services, including Claude Code and Chat, as complaints surged on Downdetector late Sunday night.

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.