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Anthropic loosens Fable 5's biology restrictions but keeps the guardrails on for virology and toxicology
The Decoder·August 7, 2026·1 min read

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Anthropic has reduced false positives in Fable 5's biology safety filters by 85%, allowing more queries to pass through. However, restrictions remain for sensitive areas such as virology and toxicology.
From the source
Anthropic has cut false positives in its biology safety filters for Fable 5 by about 85 percent. Previously, nearly all biology-related queries got blocked and rerouted to the less capable Opus 5. The restrictions stay in place for sensitive dual-use topics like virology and toxicology. The article Anthropic loosens Fable 5's biology restrictions but keeps the guardrails on for virology and toxicology appeared first on The Decoder.
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