The US government has lifted restrictions on powerful AI models developed by Anthropic, although it is unclear what restrictions were previously in place or what models are now unrestricted. Some reports specify that models such as Fable and Mythos are now unrestricted, while others mention Anthropic's most advanced or powerful models. There are conflicting reports about the US government's previous stance on Anthropic's AI models, with some outlets suggesting a crackdown or block, while others indicate a lifting of restrictions.