Anthropic Blocks Fable 5 and Mythos 5 Under US Pressure

Anthropic has recently made the decision to disable access to its latest artificial intelligence models, Fable 5 and Mythos 5, launched this month, in response to a directive from the U.S. government. This measure comes after the Trump administration imposed export controls, prohibiting the use of these models by any foreign entity or individual, including foreign employees of Anthropic.

The company received a letter from the U.S. government on Friday evening, around 5:21 PM Eastern Time, mentioning national security concerns. Although the letter does not specify these concerns in detail, Anthropic indicated that the order aimed to prevent a potential circumvention of Fable 5. However, the company contests the severity of this threat, asserting that the technique in question is limited and relies on already known vulnerabilities. Anthropic clarified that the net effect of this order was to disable the models for everyone to ensure compliance.

This situation occurs against a backdrop of ongoing tensions between Anthropic and the Trump administration. In February, the Pentagon had already labeled the startup as a risk to the supply chain, which led Anthropic to file lawsuits against the Department of Defense. These proceedings are still ongoing, with two lawsuits related to the government's supply chain risk label still pending.

Despite these challenges, Anthropic has assured that access to its other AI models would not be affected by this decision. A White House spokesperson has not yet commented on the matter, while Anthropic continues to comply with the order while expressing its disagreement with the government's conclusions.