Claude change history: Elevated errors on claude.ai, Claude Code, Claude Cowork and the Claude API

A major incident caused errors across claude.ai, Claude Code, Claude Cowork and the Claude API, disrupting sign-ins and other workflows; some messages may not have been saved. Reported impact was 14:00–14:59 UTC on 2026-09-29. The incident record started at 2026-09-29 14:21 UTC and resolved at 2026-09-29 16:27 UTC (computed duration: 2 h 5 min).