Anthropic change history: Elevated errors on Claude Code and Claude Cowork

Anthropic reported a major outage affecting Claude Cowork and Claude Code on the web: some sessions failed to start or disconnected mid-task due to an upstream cloud provider issue. It started at 2026-08-28 17:22 UTC and was resolved at 2026-08-28 20:21 UTC, lasting 2 h 59 min. A mitigation was applied; affected sessions could be retried.