Simon Willison 4/24/2026

An update on recent Claude Code quality reports

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This article details Anthropic's postmortem analysis of recent complaints about Claude Code quality degradation. The issues were not due to the models themselves but three separate bugs in the Claude Code harness. A key bug cleared older thinking from idle sessions but triggered every turn, making Claude seem forgetful and repetitive. The article highlights the complexity of debugging agentic systems and is relevant for developers building such systems.

An update on recent Claude Code quality reports

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