OpenAI and Google Staff Back Anthropic in Legal Fight Against Pentagon

The AI industry has reached a rare moment of unified resistance as employees from OpenAI and Google have formally backed Anthropic in its legal battle against the U.S. Department of Defense (DOD). The conflict centers on the DOD's recent designation of Anthropic as a "supply chain risk," a move that effectively blacklists the company from lucrative federal contracts and casts a shadow over its reputation. This unprecedented show of solidarity between fierce competitors suggests that the industry views the Pentagon's regulatory actions not as an isolated incident, but as a systemic threat to the broader AI and cloud ecosystem.

The lawsuit, filed on March 9, 2026, marks a significant escalation in the tension between the Trump administration's national security apparatus and Silicon Valley AI giants. By labeling Anthropic a supply chain risk, the DOD has invoked authorities typically reserved for foreign adversaries or companies with clear ties to hostile regimes. For Anthropic—a company founded on principles of "AI safety" and backed by billions in investment from Amazon and Google—this designation is both a commercial and existential threat. The amicus brief filed by nearly 40 employees from OpenAI and Google DeepMind argues that such designations, if left unchecked and opaque, could stifle innovation and create a climate of uncertainty for all domestic AI developers seeking to work with the public sector.

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The AI industry has reached a rare moment of unified resistance as employees from OpenAI and Google have formally backed Anthropic in its legal battle against the U.S.

The involvement of Jeff Dean, Google’s Chief Scientist and the lead for the Gemini project, adds significant weight to the legal challenge. Dean’s participation signals that the concerns are not merely coming from mid-level staff but represent a consensus among the technical elite who build the world's most advanced large language models. The brief emphasizes that the criteria for "supply chain risk" must be transparent and evidence-based, rather than being used as a blunt instrument for political or protectionist agendas. This is particularly relevant for the SaaS and Cloud sectors, where government contracts—such as the multi-billion dollar Joint Warfighting Cloud Capability (JWCC)—are a primary revenue driver. If the DOD can arbitrarily exclude a major player like Anthropic, no provider is truly safe from sudden exclusion.