Anthropic cuts Fable 5 bio false positives 85% — but why is it still terrified of virology

anthropic reduced fable 5's biology safety filter false positives by roughly 85%, ending the policy that rerouted nearly all biology queries to the less capable opus 5. the updated classifier permits benign tasks like interpreting lab results and understanding symptoms, but strictly blocks dual-use research in virology, toxicology, and molecular design. the company cites u.s. intelligence assessments and bioweapon studies as evidence that biological risks are harder to contain than cyber threats. access programs are being developed to allow researchers to eventually use these restricted features.