The U.S. government recently issued a new export control directive citing instructions from the U.S. National Security Department, which requires Anthropic to immediately suspend access to the Claude Fable/Mythos 5 models by all foreign citizens. Even overseas employees of U.S. companies in the United States cannot access these models. This ban also directly results in Company A’s own foreign employees not being able to use Claude Fable/Mythos 5.
Based on compliance requirements, Company A has decided to immediately suspend the provision of Claude Fable/Mythos 5 globally. These models cannot be used regardless of whether they are in the United States. Other cooperative platforms such as Amazon AWS also immediately cut off access. As for when model access can be restored, it may not be known until Company A discusses with the US government.
May be related to model jailbreak:
Yesterday, a well-known AI model jailbreak expert successfully jailbroken the Claude Fable/Mythos 5 model. There are many methods used by the jailbreak experts, but as long as they are announced, other users can also try to use these methods to jailbreak, and the jailbreak success rate may be relatively high, allowing the model to give detailed answers to various sensitive contents.
The U.S. government mentioned in an export control order issued to Company A that they have discovered ways to bypass or crack the Claude Fable 5 model. Company A's review of demonstrations of this specific technology confirmed that the technology can be used to identify a small number of previously noted minor vulnerabilities that appear to be relatively simple and can be exploited by other models without bypassing them.
However, it is not clear whether the technical demonstration mentioned here is the method used by jailbreak experts. However, considering that the US government does not require a complete suspension of model access, but only prohibits foreign citizens from using these models, the problems discovered by the US National Security Agency may not be directly related to those mentioned by jailbreak experts. It is just that it is impossible to say that the agency will also refer to the ideas of jailbreak experts to find jailbreak methods.
Company A expressed its dissatisfaction in an open letter:
Company A claims that currently no model is 100% resistant to cracking, and currently no tester can find a universal jailbreak solution. The defense-in-depth strategy adopted by Claude Fable/Mythos 5 can make jailbreak more difficult. Combined with comprehensive monitoring technology, Company A can quickly detect and block any successful attacks, which can reduce the risk of the model being jailbroken.
Agency A also mentioned that the U.S. government did not provide any detailed disclosure information that would lead to harmful consequences in the export control ban, which means that the jailbreak solutions that have been disclosed are either completely harmless or are insignificant discoveries. It is very unreasonable for Agency A to recall commercial software that has been deployed to hundreds of millions of users just because of the potential security vulnerabilities discovered.
Company A believes that the US government has the right to prevent the deployment of unsafe models, but this should be exercised through legal procedures that are transparent, fair, clear and based on technical facts, rather than requiring the implementation of controls based solely on verbal instructions. Therefore, this action is not in line with principles. Company A is continuing to communicate with the US government and strive to restore the Claude Fable/Mythos 5 model service as soon as possible.