OpenAI CEO Sam Altman announced Friday that his company reached an agreement with the War Department to deploy its artificial intelligence models on its classified network, just hours after the president. donald trump ordered federal agencies to phase out rival Anthropic.

Altman said in a post to X that he had been in talks with the Pentagon, who “showed a deep respect for security and a desire to work together to achieve the best possible outcome.”

“AI safety and the broad distribution of benefits are at the core of our mission,” he said. “Two of our most important security principles are the prohibition of mass domestic surveillance and human responsibility for the use of force, including autonomous weapons systems. The DoW agrees with these principles, reflects them in law and policy, and we put them in our agreement.”

The deal came after Trump ordered all federal agencies to stop using anthropogenic technology, escalating a standoff over how artificial intelligence it should be used in military operations.

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OpenAI CEO Sam Altman announced a deal with the War Department to deploy the company’s AI models on classified military networks. (Nathan Laine/Bloomberg via Getty Images/Getty Images)

In a Truth Social post, Trump said agencies, including the War Department, would have a six-month phase-out period.

“Humans better get their act togetherand be useful during this phase-out period, or I will use the full power of the Presidency to enforce them, with significant civil and criminal consequences to follow,” he wrote.

Secretary of War Pete Hegseth later said he was ordering the department to designate Anthropic as a “national security supply chain risk.”

“Effective immediately, no contractor, supplier, or partner doing business with the U.S. military may conduct any commercial activity with Anthropic,” he added. “Anthropic will continue to provide its services to the War Department for a period of not more than six months to allow for a seamless transition to better and more patriotic service.”

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President Donald Trump ordered federal agencies to eliminate anthropogenic technology while OpenAI secured a Pentagon deal. (Al Drago/Getty Images/Getty Images)

Anthropic CEO Dario Amodei had rejected previous demands from the War Department to allow its AI to be used for “all lawful purposes,” citing concerns about “mass domestic surveillance” and “fully autonomous weapons.”

Anthropic told Fox News Digital on Friday that Hegseth’s designation of the company as a supply chain risk “follows months of negotiations that reached an impasse over two exceptions we requested to the legal use of our AI model, Claude: mass domestic surveillance of Americans and fully autonomous weapons.”

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The Pentagon moved forward with an OpenAI deal after designating Anthropic as a supply chain risk. (Anna Moneymaker/Getty Images/Getty Images)

“We have not yet received direct communication from the War Department or the White House regarding the status of our negotiations,” the company said.

Anthropic added that it “tried in good faith to reach an agreement with the War Department,” supporting all lawful national security uses of AI, except for the two requested exceptions, which it said “have not affected any government missions to date.”

The company also called the supply chain risk designation an “unprecedented action, an action historically reserved for U.S. adversaries, never before publicly applied to a U.S. company.”

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Altman said OpenAI would deploy additional safeguards to ensure its models “behave the way they’re supposed to behave” and that the company would only operate on cloud networks.

“We call on the DoW to offer these same terms to everyone AI companieswhich in our view we think everyone should be willing to accept,” Altman continued. “We have expressed our strong desire to see things de-escalate away from legal and government action and toward reasonable settlements.”

Brie Stimson of FOX Business contributed to this report.