Anthropic, a US-based artificial intelligence company, has suspended access to its newest AI models, Fable 5 and Mythos 5. The decision follows a directive from the US government citing national security concerns. Details of the specific concerns prompting the restrictions have not been publicly disclosed. Anthropic stated it is complying with the government’s request and working to understand the implications of the new rules. The company emphasized its commitment to responsible AI development and national security. This move highlights increasing scrutiny of advanced AI technologies by US authorities. The suspension impacts availability of these models to developers and researchers.