Improving Fable 5 Safeguards

Anthropic · 11

Anthropic refined Claude Fable 5's biology safeguards to reduce false positives where legitimate queries were incorrectly blocked and rerouted to a less capable model. The updated classifier reduces biology-related fallbacks by approximately 85%, enabling the model to assist with everyday health questions, educational biology tasks, and clinical support for healthcare professionals. Users will experience fewer interruptions when asking about lab results and disease symptoms, though the model continues to block dual-use research in virology, toxicology, and molecular design pending trusted access pathways.