Anthropic's most powerful public AI model was taken offline just days after launch. Before the ban, I tested Fable 5 against leading models to see what made it so controversial.

AI startup Anthropic was forced to disable access to its flagship Fable 5 and Mythos 5 models worldwide after receiving an export-control directive from the US government.

Everyone at the frontier should understand that in practice, you do need an explicit green light from the government now.