Key TakeawaysFederal authorities ordered a complete halt to Anthropic’s AI technology across all government agencies, citing national security supply-chain concerns.Within hours of Anthropic’s dismissal, OpenAI secured a Pentagon agreement to integrate its AI systems into classified military infrastructure.The $200 million Pentagon arrangement with Anthropic fell apart when the company declined to permit its technology for autonomous weaponry or widespread domestic monitoring.While OpenAI claims its agreement contains identical usage limitations that Anthropic demanded, skeptics wonder if the company will maintain those boundaries.Anthropic plans legal action against the supply-chain risk classification, arguing the decision lacks legal foundation.On Friday, the United States government severed its partnership with Anthropic and classified the AI firm as a supply-chain security threat. Shortly afterward, competing company OpenAI revealed a fresh agreement to integrate its artificial intelligence technology into the Pentagon’s secure networks.Tonight, we reached an agreement with the Department of War to deploy our models in their classified network.In all of our interactions, the DoW displayed a deep respect for safety and a desire to partner to achieve the best possible outcome.AI safety and wide distribution of…— Sam Altman (@sama) February 28, 2026President Donald Trump mandated that all federal departments cease operations with Anthropic’s technology effective immediately. Organizations currently utilizing the company’s Claude AI systems have six months to complete their migration to alternative solutions.Defense Secretary Pete Hegseth declared via X that Anthropic represents a “Supply-Chain Risk to National Security.” This classification typically applies to entities from hostile nations such as China.This week, Anthropic delivered a master class in arrogance and betrayal as well as a textbook case of how not to do business with the United States Government or the Pentagon.Our position has never wavered and will never waver: the Department of War must have full, unrestricted…— Secretary of War Pete Hegseth (@SecWar) February 27, 2026The decision carries implications beyond government contracts. Organizations partnering with the Pentagon may face requirements to demonstrate they’ve eliminated Claude from their operations entirely. Major corporations including Nvidia, Amazon, and Google count themselves among Anthropic’s investors and collaborators.Anthropic had achieved a milestone as the initial AI laboratory to integrate its models within the Pentagon’s secure computing environment. The July agreement carried a potential value reaching $200 million.Negotiations collapsed when Anthropic declined to ensure its artificial intelligence would remain accessible for all legally permissible military applications. The company established firm boundaries against autonomous weaponry and large-scale domestic monitoring programs.Pentagon officials indicated Anthropic should rely on military adherence to existing legal frameworks. Anthropic CEO Dario Amodei stated Thursday that his organization “cannot in good conscience” accept such terms.OpenAI Secures Pentagon PartnershipOpenAI CEO Sam Altman revealed the Pentagon arrangement late Friday through X. He indicated the contract incorporates identical restrictions regarding mass surveillance and autonomous weapons systems that Anthropic had sought.Altman further stated OpenAI requested the administration extend comparable contract conditions to all artificial intelligence providers. Elon Musk’s xAI had previously received military authorization for deployment in classified environments.OpenAI President Greg Brockman and his spouse contributed $25 million to a Trump-aligned political action committee during the previous year. They continue financial support for Trump’s artificial intelligence initiatives in forthcoming electoral contests.Anthropic Prepares Legal ResponseAnthropic expressed being “deeply saddened” by the classification and intends to pursue judicial remedies. The organization characterized the determination as “legally unsound” and warned it establishes a troubling precedent for American technology companies engaging in government negotiations.The General Services Administration announced Anthropic’s removal from its catalog of approved products available to government entities.Certain observers expressed criticism toward OpenAI’s actions. Democratic figure Christopher Hale announced on X his cancellation of ChatGPT membership in favor of switching to Claude Pro Max.Anthropic emerged in 2021 when researchers departed OpenAI due to apprehensions about diminishing safety priorities. Both organizations have secured funding in the tens of billions recently and are evaluating potential public stock offerings.The controversy also referenced a particular event. Following Claude’s deployment during a Venezuela operation in January, an Anthropic staff member contacted a Palantir associate seeking clarification on the technology’s application. Pentagon leadership interpreted this communication as inappropriate interference.Anthropic maintained the conversation represented standard technical coordination between collaborative partners.The post Pentagon Switches AI Partners: OpenAI Replaces Anthropic After Security Dispute appeared first on Blockonomi.