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Jon Keegan

Report: US Treasury wants to get a look at Anthropic’s Mythos model

Anthropic’s relationship with the US government is complicated — and the Treasury Department is reportedly looking to make it even more so.

The Pentagon has officially deemed the startup a national security supply chain risk after it refused to allow its Claude AI to be used for any and all national security applications, including domestic surveillance and autonomous killing.

But since Anthropic’s unusual announcement of its next model, Mythos, other parts of the US government want to get their hands on it.

Bloomberg reports that the US Treasury is interested in getting access to Mythos for its own security testing. Last week, Treasury Secretary Scott Bessent summoned top Wall Street CEOs to Washington to discuss the cybersecurity implications of the new model.

Mythos has not yet been released to the public, as Anthropic has deemed its potential offensive cybersecurity capabilities to be too dangerous for wide release, and has opted to share the powerful new model only with a group of leading tech companies.

Anthropic wants these early access partners to test out the model, hoping to secure any major vulnerabilities before a public release. OpenAI also shared a forthcoming AI-powered cybersecurity tool with a select group of partners to shore up defenses in light of advances in detecting vulnerabilities.

European regulators were apparently left out of the loop from the Mythos announcement, and are also eager to test the new model.

US Treasury Seeking Access to Anthropic’s Mythos to Find Flaws

US Treasury Seeking Access to Anthropic’s Mythos to Find Flaws

But since Anthropic’s unusual announcement of its next model, Mythos, other parts of the US government want to get their hands on it.

Bloomberg reports that the US Treasury is interested in getting access to Mythos for its own security testing. Last week, Treasury Secretary Scott Bessent summoned top Wall Street CEOs to Washington to discuss the cybersecurity implications of the new model.

Mythos has not yet been released to the public, as Anthropic has deemed its potential offensive cybersecurity capabilities to be too dangerous for wide release, and has opted to share the powerful new model only with a group of leading tech companies.

Anthropic wants these early access partners to test out the model, hoping to secure any major vulnerabilities before a public release. OpenAI also shared a forthcoming AI-powered cybersecurity tool with a select group of partners to shore up defenses in light of advances in detecting vulnerabilities.

European regulators were apparently left out of the loop from the Mythos announcement, and are also eager to test the new model.

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Anthropic pulls Fable and Mythos access worldwide after Trump administration bars their use by foreign nationals

Only days after releasing two versions of its next-gen AI model, Anthropic has disabled them for users worldwide.

Anthropic says it received a Friday night order from the Trump administration to suspend access to the models for any foreign national (anywhere in the world) — a group that included some Anthropic employees. In response, the company turned off access to everyone.

Last week, the company released to the public its much-anticipated Claude Fable 5 model (and its restricted version Claude Mythos 5, which is still being tested with trusted partners). Anthropic said in a blog post announcing the action that officials cited national security concerns with the new models, while offering few specific details.

The post said that the government gave the company “verbal evidence of a potential narrow, non-universal jailbreak” of the public Fable 5 model. A jailbreak is a means by which users can evade restrictions built into the code to unlock prohibited functionality. Anthropic downplayed the significance of the attack, and said other major models, such as OpenAI’s GPT-5.5, could also be affected by the technique described.

Fears of these first Mythos-class models being misused are running high, after Anthropic warned the cybersecurity world in May that the advanced cyber capabilities of Mythos have rapidly discovered thousands of vulnerabilities in ubiquitous software, leading to the decision to restrict the full version of the model to a close group of trusted partners for testing.

This morning, Axios reported that Anthropic technical staff have flown to Washington to meet with White House officials to resolve the issue.

The Wall Street Journal is reporting that the Trump administration’s decision to take action against Anthropic was prompted by discussions that Amazon CEO Andy Jassy had with officials, including Treasury Secretary Scott Bessent. According to the report, Amazon researchers said they had been able to evade some of Fable 5’s security restrictions using specific prompts. Amazon is a major investor in Anthropic.

Anthropic is currently suing the US government to fight the Pentagon’s blacklisting of the company on national security grounds.

Statement on the US government directive to suspend access to Fable 5 and Mythos 5

Statement on the US government directive to suspend access to Fable 5 and Mythos 5

Last week, the company released to the public its much-anticipated Claude Fable 5 model (and its restricted version Claude Mythos 5, which is still being tested with trusted partners). Anthropic said in a blog post announcing the action that officials cited national security concerns with the new models, while offering few specific details.

The post said that the government gave the company “verbal evidence of a potential narrow, non-universal jailbreak” of the public Fable 5 model. A jailbreak is a means by which users can evade restrictions built into the code to unlock prohibited functionality. Anthropic downplayed the significance of the attack, and said other major models, such as OpenAI’s GPT-5.5, could also be affected by the technique described.

Fears of these first Mythos-class models being misused are running high, after Anthropic warned the cybersecurity world in May that the advanced cyber capabilities of Mythos have rapidly discovered thousands of vulnerabilities in ubiquitous software, leading to the decision to restrict the full version of the model to a close group of trusted partners for testing.

This morning, Axios reported that Anthropic technical staff have flown to Washington to meet with White House officials to resolve the issue.

The Wall Street Journal is reporting that the Trump administration’s decision to take action against Anthropic was prompted by discussions that Amazon CEO Andy Jassy had with officials, including Treasury Secretary Scott Bessent. According to the report, Amazon researchers said they had been able to evade some of Fable 5’s security restrictions using specific prompts. Amazon is a major investor in Anthropic.

Anthropic is currently suing the US government to fight the Pentagon’s blacklisting of the company on national security grounds.

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