Anthropic April 23 Postmortem: 3 Confounding Changes Behind Claude Code's Month-Long Quality Drop Reading like an aviation accident report β engine fault, pilot error, weather. Each alone wouldn't have crashed the plane. Three together did. For the past month, developers using Claude Code have reported degraded quality: shorter responses, lost context mid-session, and faster usage limit consumption. On April 23, 2026, Anthropic published a detailed engineering postmortem confirming what many suspected. Three separate, concurrently-deployed changes compounded into broad, hard-to-diagnose symptoms. This is one of the most transparent AI lab postmortems I've seen. The engineering lessons on incident governance for AI systems are worth unpacking β especially for solo developers and small teams working with LLMs in production. The Affected Surface Area Per Anthropic's writeup, only three products were affected: Claude Code Claude Agent SDK Claude Cowork The Anthropic API itself was not affected.β¦
