3 sources are reporting on this story. BBC News, BBC World are covering this developing story.
Sentiment across sources: 3 neutral.
Key entities: AI, Claude Fable, Anthropic, Claude Mythos.
BBC News reports: Claude Fable 5 is a version of Anthropic's Claude Mythos, an AI program which caused a stir among technology, finance, and government leaders
BBC World: Version of AI tool 'too powerful for public' released to public
BBC News: Version of AI tool 'too powerful for public' released to public