Anthropic Rewrites Claude's Biology Classifier, Cutting False Positives by ~85%

dl_weekly · x · 2026-08-14

Anthropic rewrote the constitution for Claude Fable 5's biology classifier, successfully reducing false-positive fallbacks by approximately 85%.

This illustrates a common tradeoff in AI safety: launching broad safeguards early on, followed by iterative refinements to improve precision over time.

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