Claude change history: Elevated errors across many models

Claude reported a major incident affecting claude.ai, Claude API (api.anthropic.com), Claude Code and Claude Cowork: some users had login issues, including via oAuth, and model request errors. It started at 2026-08-04 20:48 UTC and was resolved at 2026-08-04 21:59 UTC, lasting 1 h 11 min; success rates had recovered by 21:04 UTC.