In an unusual display of industry solidarity, over 30 employees from leading AI firms OpenAI and Google DeepMind, including Google DeepMind’s chief scientist Jeff Dean, have filed an amicus brief in support of competitor Anthropic. The brief backs Anthropic in its legal challenge against the U.S. Department of Defense (DOD), which recently designated Anthropic a “supply chain risk”.
Anthropic initiated its lawsuit against the Department of Defense on March 9, 2026, hours before the amicus brief was filed. The company is contesting the Pentagon’s decision to blacklist it, labeling the action “unprecedented and unlawful.” This designation, which severely restricts Anthropic’s ability to work with military contractors, came after the AI firm refused to permit unrestricted military use of its technology for purposes such as mass surveillance of Americans or fully autonomous weapons.
The amicus brief, filed by the employees in their personal capacity, argues that the DOD’s actions are “improper and arbitrary” and could negatively impact U.S. competitiveness in the artificial intelligence sector. The signatories, including prominent researchers like Zhengdong Wang, Alexander Matt Turner, and Noah Siegel from Google DeepMind, and Gabriel Wu, Pamela Mishkin, and Roman Novak from OpenAI, emphasize their shared concerns over government intervention in AI development. According to The Tech Buzz, this cross-company coalition highlights a rare moment of unity in the AI industry against what many perceive as government overreach.
Jeff Dean’s involvement is particularly notable, signaling the gravity with which the industry views this legal battle. According to The Tech Buzz, his participation indicates that the regulatory fight has evolved into a sector-wide clash over the freedom of AI development and government oversight. The employees’ brief states, “If allowed to proceed, this effort to punish one of the leading US AI companies will undoubtedly have consequences for the United States’ industrial and scientific competitiveness in the field of artificial intelligence and beyond.” Anthropic, whose financial backers include Google and Amazon, maintains its commitment to national security but insists this lawsuit is a necessary step to protect its business, customers, and partners.
This case could establish a significant precedent for how the DOD interacts with commercial AI laboratories concerning safety protocols and deployment decisions.