Anthropic's foreign access restrictions have been lifted after the company resolved US government safety concerns around its Fable 5 and Mythos 5 artificial intelligence models. The initial ban followed concerns raised by Amazon.com that certain safeguards on Fable could be bypassed, but Anthropic has since developed a classifier-based fix backed by the Commerce Department's Center for AI Standards and Innovation. These smaller AI systems are designed to detect requests linked to prohibited cybersecurity tasks, potentially easing one of the key concerns behind the 18-day restriction. The reversal could be an important signal for the broader AI market, especially as Anthropic appears to be moving into deeper cooperation with US regulators. The company is expected to send staff to CAISI's offices, provide computing power, and offer its own safety testers for more detailed analysis. Anthropic is also working with Amazon and Microsoft on protocols and standards for future AI models, although the exact concessions made during the closed-door talks remain largely undisclosed. The ban unsettled European companies, triggered criticism from more than 100 cybersecurity experts, and raised warnings from tech executives and investors that tougher restrictions could possibly give Chinese AI developers more time to gain market share.