Mystery solved: Anthropic reveals changes to Claude's harnesses and operating instructions likely caused degradation

Mystery solved: Anthropic reveals changes to Claude's harnesses and operating instructions likely caused degradation
Published in : 23 Apr 2026

Mystery solved: Anthropic reveals changes to Claude's harnesses and operating instructions likely caused degradation

For several weeks, a growing chorus of developers and AI power users claimed that Anthropic’s flagship models were losing their edge. Users across GitHub, X, and Reddit reported a phenomenon they described as "AI shrinkf...

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