According to the Wall Street Journal, the export control directive that led to Anthropic cutting off access to Fable 5 and Mythos 5 was triggered in part by cybersecurity research from Amazon and conversations between CEO Andy Jassy and the White House. According to the report, the paper from Amazon claims that, through a series of prompts, it was able to get Fable 5 to serve up information that could be used in cyberattacks. Amazon has yet to respond to a request for comment.
Shortly after Jassy shared the company’s findings with the government, it made the call to block its use by foreign nationals. Complicating this issue is that many of Anthropic’s researchers are foreign-born, meaning they were barred from accessing their own product.
In a statement, Anthropic disputed the government’s characterization of the issue as a “jailbreak.” It argued that many of the same vulnerabilities could be discovered using other publicly available models, including GPT 5.5. Some security researchers appear to back the company’s interpretation. Katie Moussouris, the founder and CEO of LutaSecurity posted on BlueSky that “I’ve seen the paper. It’s not a jailbreak.” Former Commerce Department official Kate Koren speculated to the WSJ that the White House’s dislike of Anthropic may have influenced the decision.
Anthropic and the Trump administration have been at odds for some time over the company’s refusal to allow its AI to be used for mass surveillance of Americans or to power lethal autonomous weapons. In February, Trump instructed federal agencies to stop using Anthropic’s AI. And just hours later, Secretary of Defense Pete Hegseth designated the company a supply chain risk.
The government and the company seemed to have made amends, and the two had worked together to expand access to Mythos. However, now the two seem destined to clash again.
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Stay tuned for updates on amazon security research reportedly led as the story develops. Related: After betting the firm on Anthropic, Menlo Ventures raises victorious $3B fund.
Frequently Asked Questions
According to the Wall Street Journal, cybersecurity research from Amazon: a paper showed Fable 5 could be prompted through a series of prompts to serve up information usable in cyberattacks, and CEO Andy Jassy shared the findings with the White House.
It disputed the jailbreak characterization, arguing the same vulnerabilities could be found using other public models like GPT 5.5; security researcher Katie Moussouris backed this, saying it is not a jailbreak.
Many of its researchers are foreign-born and were barred from their own product; the company has refused to let its AI be used for mass surveillance of Americans or lethal autonomous weapons, putting it at odds with the administration.
Former Commerce official Kate Koren speculated to the WSJ that the White House's dislike of Anthropic may have influenced the decision.
