Why OpenAI and Google Employees Are Standing Behind Anthropic in Its DOD Legal Battle

Over 30 employees from OpenAI and Google DeepMind have filed a formal amicus brief in support of Anthropic's lawsuit against the U.S. Department of Defense, after the federal agency controversially designated the AI safety company a supply-chain risk — a classification typically reserved for foreign adversaries — according to court filings submitted Monday.

"The government's designation of Anthropic as a supply chain risk was an improper and arbitrary use of power that has serious ramifications for our industry," the brief states. Among its signatories is Jeff Dean, chief scientist at Google DeepMind — a notable figure whose endorsement signals just how broadly this dispute has reverberated across the AI research community.

The conflict escalated late last week when the Pentagon formally designated Anthropic a supply-chain risk — a label with significant procurement and reputational consequences — after the Claude developer declined to permit the Department of Defense to deploy its technology for mass surveillance of U.S. citizens or to enable autonomous weapons systems. The DOD had maintained that it should retain broad discretion to apply AI capabilities to any "lawful" purpose, unconstrained by the ethical guardrails a private contractor chooses to enforce. Anthropic's refusal to yield on those terms appears to have triggered the retaliatory designation.

The amicus brief entered the court docket within hours of Anthropic filing dual lawsuits against the DOD and related federal agencies. Wired first reported the development.

In the court filing, the Google DeepMind and OpenAI signatories argue that the Pentagon's response was disproportionate and procedurally unjustifiable. If the agency was "no longer satisfied with the agreed-upon terms of its contract with Anthropic," they contend, it could have "simply canceled the contract and purchased the services of another leading AI company" — a straightforward remedy that renders the supply-chain designation appear punitive rather than procedural.

That alternative path is particularly pointed given what followed. The DOD moved swiftly to ink a new agreement with OpenAI almost immediately after issuing the Anthropic designation — a sequence of events that drew sharp internal criticism from a number of OpenAI's own employees, underscoring the degree to which this dispute has fractured consensus even within individual organizations.

"If allowed to proceed, this effort to punish one of the leading U.S. AI companies will undoubtedly have consequences for the United States' industrial and scientific competitiveness in the field of artificial intelligence and beyond," the brief warns. "And it will chill open deliberation in our field about the risks and benefits of today's AI systems."

The filing goes further, affirming that Anthropic's stated ethical boundaries — its refusal to enable mass surveillance or autonomous lethal systems — represent legitimate, industry-recognized safeguards rather than arbitrary commercial obstruction. In the absence of comprehensive federal legislation governing AI deployment in defense contexts, the brief argues, the usage restrictions that developers embed in their contracts and model specifications serve as a critical line of defense against catastrophic misuse. It's a position that speaks directly to a broader unresolved tension in the industry: who ultimately governs how powerful AI systems are used when public law hasn't caught up to the technology.

The episode has also galvanized collective action across the sector. Many of the researchers and engineers who signed Monday's brief had previously added their names to open letters over recent weeks calling on the DOD to rescind the designation, and urging the leadership of their own companies to stand behind Anthropic and decline to offer the Pentagon unconstrained access to their AI systems.