Anthropic blocks access to Fable 5 and Mythos 5 after U.S. directive

Anthropic said it has disabled access to its Fable 5 and Mythos 5 AI models after receiving a U.S. government order tied to national security concerns. The company said the directive required it to stop access for foreign nationals, including foreign national employees. The models were cut off for all customers to ensure compliance, but Anthropic said its other AI systems were not affected. The move came only days after the company introduced the two models and described them as advanced tools with strong benchmark performance. Anthropic said the government did not explain the specific national security issue behind the order. The company also said it disagreed with the process, arguing that any restrictions on AI deployments should follow a transparent and technically grounded review.