White House officials signal there is "zero chance" of a British exemption from restrictions on Anthropic’s most advanced AI models.

The firm said it was ordered to block foreign nationals from accessing its state of the art Fable 5 and Mythos 5 AI models on national security grounds.

Anthropic said it believed the US government had become aware of a potential means of jailbreaking Fable 5.

America has taken a significant step by blocking foreign access to Anthropic's top AI models. This move follows concerns about bypassing security features in their latest AI.…