Featured on a new “Free Fable” website, the letter — signed by representatives from companies like Adobe, NVIDIA and Zoom, along with academics from Johns Hopkins and the University of Maryland, Baltimore College — asks Commerce Secretary Howard Lutnick and National Cyber Director Sean Cairncross to reverse the suspension of Anthropic’s latest model.

The White House’s Friday decision to suspend access to Fable 5, which is a consumer-safe variation of Anthropic’s cybersecurity-focused Mythos model, initially only applied to foreign nationals both within and outside of the U.S. Given the challenges surrounding cutting off access to specific IP addresses for specific users, Anthropic announced it would disable access to Fable 5 for all users. 

The decision comes as Anthropic and elements of the U.S. government are still in litigation over the Trump administration designating the company a supply chain risk following a dispute between Anthropic and the Pentagon over barring use of the company’s AI products in autonomous weaponry and surveillance operations. 

In the letter released Monday, the signatories protested the government’s export controls, saying that it “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 signatories said the inherent protections built into Fable to prevent its use for cyber offenses and identify the ongoing race to AI dominance with adversarial nations like China were reasons to unleash Fable for use by the cyberdefense community. 

“Anthropic has built multiple protections into the Fable model to prevent its use for cyber offensive uses. These protections were so aggressive as to be the source of humor in the cyber community on launch day,” the letter said. “It is essential to provide AI to coders and security teams so they can find and fix flaws in their own newly-written as well as decades of legacy code faster than our adversaries.”

The signatories recommended four approaches that the administration should take on AI policy going forward, starting with public sector regulators collaborating with industry and academia for input and using a democratic rule-making process for new AI policy.

The letter also recommended transparent enforcement with “appropriate time given to remediate” and using the “minimal extent necessary” to ensure the safety of the American public are the. 

Other private sector organizations who did not sign the letter have also expressed confusion following the administration’s export controls and are trying to ensure clear communication with the White House. 

“Many people are closely monitoring this situation to see whether Anthropic and the White House can overcome their differences, establish a better rapport, and quickly resolve this situation,” an industry source told Nextgov/FCW. “At the same time, there’s some general unease about the use of export controls to gain leverage over the AI companies because of some of the unintended consequences it might initiate.” 

TJ Marlin, the CEO of Guardrail Technologies, an AI-powered enterprise security platform that works to detect risks in other AI systems, underscored the need for cyberdefenders to have the best tools to consistently be able to monitor, detect and patch network vulnerabilities.

“The question is not whether a given model's protections can be bypassed,” Marlin told Nextgov/FCW. “The question is who finds the weakness first, the defender or the attacker, and whether the organization is built to keep finding them on a schedule that never ends.”