Cybersecurity vets protest ‘dangerous’ US government ban on Anthropic’s most powerful models; plus, Fox to acquire Roku in $22 billion deal
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Mitä? Ruostetta 2015 vuoden mersossa. Ruooste ei kysy auton ikää eikä arvoa. Espoon kolarikorjaamo. Tee ruostekorjaukset ja suojaukset ammattitaidolla, kaikenikäisille autoille. Espoon kolarikorjaamo.
A group made up of dozens of cybersecurity experts, including several well known veterans of the industry, published an open letter to the US government asking it to lift the export control order on anthropics fable and mythos models. According to the open letter, This action has taken the best models away from cybersecurity defenders, who now cannot use the models to find vulnerabilities and make their software and products more secure. The letter continued To pull the best capabilities away from defenders without a good reason when our adversaries are rapidly advancing is dangerous. On Friday, the US government ordered Anthropic to limit the export of fable and mythos, citing national security concerns without explaining the specific reasons behind the order.
In response, the company suspended access to the models to all users worldwide. Now, as of the writing of this article, the letter is signed by seventy six cybersecurity experts, including Alex Stamos, former Facebook Chief of Security, Casey Ellis, the founder Bug Bounty Platform Bug Crowd, John Callis, famed cryptographer and former Apple Security Design and Architecture Manager. Paul Vixie, computer scientist, and others. Now, when Mythos launched as a preview in April, Anthropic claimed it was so powerful at finding security vulnerabilities that the company needed to tightly restrict access to prevent malicious hackers or foreign adversaries from using it to cause havoc on the internet. In practice, that meant Anthropic gave around 50 companies initial access to Mythos, recently expanding that group to include around 150 organizations in 15 countries.
Anthropic released Fable, a public version of Mythos, that the company said had strict guardrails to block its use in the fields of biology, chemistry, and cybersecurity, as well as to stop others from distilling the model in order to recreate it. The guardrails on Fable were so strict that many cybersecurity experts found that it stopped essentially any prompts related to cybersecurity. Anthropic said that the White House export control. Control order may have been based on a report that there was a method to bypass or jailbreak fable to unlock its powerful mythos level capabilities. According to Katie Masuris, one of the signatories of the open letter, the method was demonstrated by Amazon researchers in a paper that is not public, but that she has reviewed.
But Mesoris said in a blog post that the paper did not actually demonstrate a real jailbreak. Instead, she wrote the researchers simply asked Fable to fix open source code with public and known vulnerabilities, along with deliberately planted vulnerabilities, after the model initially refused to review the code for security issues. She said the behavior described in the paper cannot meaningfully be fixed, and any attempt would only weaken the model for defense. Defenders need to be able to ask AI to fix the bugs in a file, explain why the fix matters, and then write tests that confirm the patch works. That is not a guardrail bypass. It is the most valuable thing an AI model can do for defensive security, executing the find, fix, and test loop defenders run every day.
Masuris' critique was echoed in the open letter, which also said that the group of experts believed that the model capabilities in the Amazon paper. can be replicated on OpenAI's GPT 5.5, on Anthropic's own publicly available Claude Opus four point eight and sonnet, and even Chinese models like Kimi 2.7. Masuris told TechCrunch that the bugs used to demonstrate the techniques in the paper can be found using the other models.
Why did dozens of cybersecurity veterans write an open letter demanding the US lift export controls on Anthropic’s Fable and Mythos models?
The method in the paper is a guardrail bypass technique. Other models that lack the fabled guardrails often will not refuse the straightforward request to look for security bugs, so they don't need a bypass.
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