Anthropic updated its Fable 5 biology safeguards on August 7, the same day Stanford and Arc Institute researchers published a paper in Science showing their Evo 1 and Evo 2 models can design fully functional viral genomes. The update reduces biology-related fallbacks on benign queries by roughly 85 percent, with Anthropic retraining its safety classifier to distinguish everyday health and educational questions from dual-use research that remains blocked. Queries touching virology, toxicology, molecular design, and drug design still route to Opus 5, a less capable model. Fable 5 is not yet usable for professional biology research or drug development, but Anthropic says it is developing trusted access pathways—a vetted, gated model for researchers. Anthropic’s capability assessments acknowledge Fable 5 could provide significant uplift to a malicious actor. Evo 2 is an open-weight model available for public download, and as The Guardian and CNN reported, the ability to compose viral genomes with generative AI now exists while governance does not. A companion commentary in Science from Johns Hopkins researchers warned of urgent biosafety and biosecurity questions. The US Intelligence Community 2026 Annual Threat Assessment notes advances in biotechnology could lead to novel biological threats from state actors. The White House AI Framework, finalized August 4, excludes open-weight models from federal security review, while closed-source labs face 30-day voluntary early access review delays.