Tools5 min read
Anthropic Confirms Three Bugs Quietly Degraded Claude Code for Weeks — and Promises a Stricter Rollout Process
After weeks of user complaints, Anthropic published a postmortem on three separate issues that degraded Claude Code between March 4 and April 20: a silent reasoning-effort downgrade, a caching bug that erased reasoning history every turn, and a 25-word system instruction that knocked 3 percent off output quality. All three are now fixed, and Anthropic is overhauling how it ships changes.