Anthropic change history: Elevated errors for Claude Sonnet 5

Claude Sonnet 5 requests experienced elevated errors affecting claude.ai, Claude API (api.anthropic.com), Claude Code and Claude Cowork. Anthropic rated the incident major; it started at 2026-09-02 21:17 UTC and was resolved after 26 min. The resolution update separately reported customer impact from 21:05 UTC to 21:19 UTC.