Anthropic's Claude services experienced elevated error rates on November 13, affecting four platforms: claude.ai, Claude Console (platform.claude.com), Claude Code, and Claude Cowork. Some users reported inability to log in to Claude.ai and Claude Code normally. Anthropic issued a status notice at 17:58 UTC+8 on Nov 13, placing the incident in the "investigating" stage. The company has not disclosed the root cause or an estimated recovery time, stating it will provide updates as soon as possible.