The U.S. government has lifted its block on Anthropic’s most powerful AI model, Mythos 5, clearing the way for the company to share it with more than 100 U.S. institutions, including major corporations and government agencies. The move cools a fast-moving fight between Washington and one of the most valuable private companies in the tech sector, and it suggests the administration prefers controlled access over a full shutdown.
Just two weeks earlier, the administration had imposed export controls on Mythos 5, forcing Anthropic to shut down the model and its sibling, Fable 5, after warnings from Amazon and others that the systems could be exploited for malicious purposes. That kind of rapid policy reversal is messy, but it also tells you something useful: in frontier AI, governments are increasingly treating model access like a national-security issue, not just a product launch.
How the Mythos 5 rollback happened
In a letter to Anthropic’s chief compute officer, Tom Brown, Commerce Secretary Howard Lutnick said he had determined that ”proper safeguards” were now in place for certain trusted partners to access Claude Mythos 5. He also pointed to ”significant progress” in daily talks between the company and the government since the block went into effect, and said Anthropic had committed to working with U.S. officials on protocols, standards, and software releases for its models.
The timing is awkward for Anthropic’s rivals and convenient for the company. On the same day, OpenAI released GPT-5.6 to a limited group of government-approved partners, a reminder that access to the most advanced models is becoming a heavily managed privilege. That pattern is likely to spread, because once regulators decide a model is too powerful to leave wide open, the default tends to become selective distribution, not blanket availability.
What happens to Fable 5 next
The letter did not mention Fable 5, the weaker model that had briefly been the most powerful AI widely available to consumers. People close to the talks say a release of Fable 5 is also moving forward, though no timing has been set. That leaves Anthropic in a familiar limbo: one model back in circulation, another still waiting for the political all-clear.
Anthropic had previously said it would block access to Mythos 5 and Fable 5 worldwide after the administration ordered the company to cut off foreign nationals, whether they were in the U.S. or abroad. The latest decision appears to replace that blunt approach with a narrower one, but the bigger question is how long any frontier model can stay ”trusted” once it becomes useful enough to matter.