Anthropic has disabled access to its Fable 5 and Mythos 5 models in response to a government directive, restricting availability for users and developers. The move signals compliance with undisclosed regulatory or national security guidance, making these models unavailable through Anthropic's standard API and web interface.
This marks one of the first high-profile model denials by a major AI lab and reflects growing government scrutiny of frontier model deployment. For enterprise customers, it reinforces the risk of regulatory action on model lineups and the importance of diversifying AI vendor dependencies.