Pathogen researchers dispute Anthropic's bioweapons case studies.

Science reports that Scripps virologist Kristian Andersen dismissed most or all of the five flagged pathogen experiments in Anthropic's September threat report as ordinary basic research, while biosecurity researcher Filippa Lentzos urged resisting both extremes. This is the first substantive expert dissent on the report that made Anthropic the first major lab to publicly say it can no longer rely on a capability gap between its models and bioweapons expertise.