Anthropic Updates Claude Fable 5’s Biology Safeguards to Reduce False Positives

Anthropic has rolled out a major update to Claude Fable 5’s biology safety classifiers, cutting biology-related “fallbacks” by roughly 85% across its product surfaces. The change means users asking legitimate health, medical, or educational biology questions will far less frequently be redirected to Opus 5, a less capable model that Fable 5 switches to whenever its safeguards detect a potentially risky query. When Fable 5 launched, Anthropic intentionally deployed extremely broad biology classifiers automated systems designed to detect when the model is being asked to perform a safeguarded or dual-use biology task. These classifiers erred heavily on the side of caution, blocking a wide swath of queries, including...

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