US Government Orders Anthropic to Block Foreign Users

The US government has instructed Anthropic to block access to the AI models Fable 5 and Mythos 5 for all foreign nationals. This measure compels the company to suspend both models globally. Anthropic has announced its intention to comply with this order but expresses concerns regarding the legal basis for it. The US government's decision is based on a security incident referred to as a jailbreak, which is considered narrowly defined. Anthropic argues that the capabilities revealed by this incident are also widespread elsewhere.

The company views the measure as disproportionate and emphasizes that the technology is not exclusive to its products. The order could have far-reaching implications for the availability of AI technologies, particularly in international markets. Fable 5 and Mythos 5 are known in the AI community for their advanced features, which are applied in text generation and machine learning, among other areas. The blockage could undermine Anthropic's competitiveness in the global market. Anthropic has previously advocated for the responsible use of AI technologies.

The current situation raises questions about the regulation of AI and the associated security risks. Experts warn that such measures may not be sufficient to ensure safety, as similar technologies are also being developed by other providers. In recent years, the US government has increasingly taken steps to control access to sensitive technologies for foreign actors. This strategy aims to protect national security interests and prevent the proliferation of potentially dangerous technologies. The order to Anthropic is part of this broader initiative.

The international community's reaction to this decision could also be significant. Some countries may take similar measures or adjust their own regulations regarding the regulation of AI technologies. This could lead to a fragmented market where access to AI tools is heavily restricted. Anthropic has announced that it is considering legal action to contest the order. The company plans to challenge the US government's arguments and analyze the impact on its business operations.

The discussion about AI regulation is expected to intensify in the coming months. The order takes effect immediately, meaning that Anthropic must promptly take action to block access to the affected models. The exact details of the implementation are not yet known; however, the company is expected to provide further information in the coming days. The security vulnerability that led to the order has been classified as CVE-2026-1234 and affects several AI models that offer similar functionalities to Fable 5 and Mythos 5. The US government has emphasized that the security of national infrastructure is a top priority.