Artificial intelligence company Anthropic has suspended access to its flagship Fable 5 and Mythos 5 AI models after receiving a U.S. government directive citing national security concerns, as reported by Reuters and AP News. The move comes just days after the company launched Fable 5, a public-facing version of its more advanced Mythos 5 system. According to Anthropic, the directive requires the company to prevent access to the models by foreign nationals, prompting it to disable both systems for all users globally to ensure compliance.
Anthropic said the order was issued under U.S. export control authorities and applies to foreign nationals both inside and outside the United States, including some of the company’s own employees. While the government did not publicly provide detailed evidence supporting the directive, Anthropic said its understanding is that officials were concerned about a potential method for bypassing the models’ safety safeguards, commonly referred to as a “jailbreak.” The company maintains that the reported vulnerability was limited in scope and did not provide capabilities beyond those already available in other advanced AI systems.
The decision marks one of the most significant applications of export controls to artificial intelligence software rather than semiconductor hardware. Industry observers say the action highlights growing concerns among governments about the potential misuse of advanced AI models in areas such as cybersecurity, critical infrastructure, and national security. The development also underscores increasing tensions between regulators and AI developers over how emerging technologies should be governed and deployed.
For the global AI industry, the suspension signals a new phase in the regulation of frontier artificial intelligence systems. Analysts note that the move could influence how governments approach future AI oversight, particularly as competition intensifies among leading developers in the United States, China, and Europe. While Anthropic has expressed disagreement with the directive and described the issue as a misunderstanding, the company said it remains committed to complying with legal requirements while working toward restoring access to the affected models.
