AI company Anthropic announced late Friday that it has disabled access to its two most advanced models, Fable 5 and Mythos 5, after receiving a government directive citing national security concerns. In a blog post, the company said it received a letter from the US government at 5:21 p.m. ET on Friday instructing it to suspend access to both models for any foreign national, whether located inside or outside the United States, including the company's own foreign-national emplo