50+ cybersecurity leaders urge Trump to lift Anthropic model ban, calling it a win for attackers
More than 50 security executives from Nvidia, Adobe, CrowdStrike and other firms signed an open letter on June 15 urging the Trump administration to reverse its export controls on Anthropic's Fable 5 and Mythos 5. The letter argues that the restrictions disarm defenders without actually limiting attackers, since rival AI models can find the same vulnerabilities without any jailbreak. Readers learn who signed, the core technical argument, and what this industry coalition means for Anthropic's Washington negotiations and IPO timeline.
More than 50 cybersecurity executives signed a public letter on Sunday urging the Trump administration to lift its export controls on Anthropic's Fable 5 and Mythos 5 models, warning that the restrictions are leaving defenders at a disadvantage in a moment when Chinese-linked hackers are escalating attacks against U.S. technology firms. 1
Nvidia, Adobe, and CrowdStrike are among the firms whose security leadership signed the letter, which was published the same day that Anthropic dispatched senior technical staff to Washington to negotiate a resolution with White House and Commerce Department officials.
What the letter says
The signatories argued that Fable 5 is not uniquely dangerous — and that pulling it from the market harms the defense side of the equation more than it constrains attackers.
"This action has taken the best models away from defenders, created market uncertainty, and risked America's AI leadership without any real risk to justify it," the letter states. 1
The letter makes two specific technical claims. First, the jailbreak that triggered Commerce Secretary Howard Lutnick's June 12 directive was narrow — a method of identifying a small number of previously known, minor vulnerabilities. Second, and more important to their argument, rival AI models can do the same thing without any bypass at all. Disabling Fable 5 does not eliminate the threat; it only removes a tool that security professionals were actively using against it.
CrowdStrike's own research frames what's at stake: the firm reported last week that China-linked hackers posed the biggest espionage threat to technology companies over the past year. 1 The letter frames Fable 5's suspension not as a national security win but as a unilateral disarmament at the worst possible moment.
Anthropic's overlapping argument
The letter mirrors what Anthropic itself wrote in its June 12 blog post announcing the shutdown. The company described the demonstration it reviewed as proof only of "a method of bypassing... Fable 5" that uncovered "a small number of previously known, minor vulnerabilities" — adding that other publicly available models found the same vulnerabilities without any jailbreak required. 2
That alignment matters: 50 industry signatures lend external weight to Anthropic's technical rebuttal and make the administration's position harder to sustain on its current terms. The White House has framed Anthropic's response to the directive as "reckless," but the company and its industry supporters are now publicly disputing whether the underlying jailbreak warranted the severity of the action taken.
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IPO and regulatory backdrop
For investors tracking Anthropic's IPO timeline, the open letter adds one more variable to an already complicated picture. The company confidentially filed a draft S-1 with the SEC on June 1 and carries a reported valuation of approximately $965 billion. 3 An unresolved export control dispute — particularly one that keeps Anthropic's two most advanced models offline for all users globally — is a material risk item that underwriters will need to price.
The letter lands at an odd moment in Anthropic's relationship with Washington. Earlier this year, the Trump administration directed federal agencies to cease working with Anthropic and designated it a supply chain risk, citing the company's resistance to surveillance and autonomous-weapons use cases. Those tensions had been showing signs of thawing as Anthropic moved toward a public offering. The June 12 export directive — and now a 50-signature industry letter pushing back on it — suggests the thaw is incomplete. 1
The outcome of Anthropic's Washington meetings this week will determine whether Fable 5 and Mythos 5 return — and how much of the IPO narrative the company controls when it decides to go public.
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