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.

The move comes after the government imposed export controls on Anthropic’s recently launched Claude Fable 5 and Mythos 5 models over concerns about a security vulnerability known as a jailbreak.