mythos-class
1 article tagged with mythos-class
June 10, 2026
analysisAnthropic
Anthropic's Claude Fable 5 Blocks Basic Biology Questions to Prevent Bioweapon Risks
Anthropic's newly released Claude Fable 5, the company's first public Mythos-class model, refuses to answer basic biology questions including 'what are mitochondria' and 'how mRNA vaccines work.' The company told The Verge the filters are intentionally 'overly conservative' to prevent bioweapon research, blocking 'most queries tied to biology work.'