Anthropic Traces Six Weeks of Claude Code Quality Complaints to Three Overlapping Product Changes

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Posted on Thu May 14 2026 | 2:46 pm

Anthropic published a postmortem tracing six weeks of Claude Code quality complaints to three overlapping product-layer changes: a reasoning effort downgrade, a caching bug that progressively erased the model's own thinking, and a system prompt verbosity limit that caused a 3% quality drop. The API and model weights were unaffected. All issues were resolved April 20.

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