Just days after launching Claude Fable 5, Anthropic has been forced to suspend access to its flagship AI model following a new U.S. government directive tied to national security concerns.
Fable 5 was released earlier this week as Anthropic's most capable publicly available AI model
The order restricts access to Fable 5 and the company's even more advanced Mythos 5 model for foreign nationals, prompting Anthropic to disable the systems entirely while it works through compliance requirements. Earning praise for its software engineering and long-horizon reasoning abilities. The model had already generated controversy after researchers discovered hidden safeguards that quietly limited certain AI-development related tasks, a policy Anthropic later revised following community backlash.
Anthropic says it disagrees with the government's assessment and believes the concerns stem from a narrow security issue rather than a broad threat. Nevertheless, the company stated it must comply with the directive and has temporarily disabled access for all users. The decision marks one of the most significant examples of governments directly restricting access to frontier AI models and highlights the growing intersection of AI development, cybersecurity, and national security policy. As regulators increasingly scrutinize advanced AI systems, the Fable 5 shutdown may be remembered as an early turning point in how governments control access to cutting-edge artificial intelligence.
