The Pentagon has struck deals with OpenAI, Google, Microsoft, Amazon, Nvidia, Elon Musk’s xAI, and the startup Reflection, allowing the agency to use their AI tools in classified settings, according to an announcement on Friday. At the same time, the Defense Department has left out Anthropic — which it previously used for classified information — after declaring it a supply-chain risk.

Emil Michael, the Defense Department’s chief technology officer, told CNBC on Friday that Anthropic is still a supply chain risk, but called its powerful security model, Mythos, a “separate national security moment,” adding that “we have to make sure that our networks are hardened up, because that model has capabilities that are particular to finding cyber vulnerabilities and patching them.”

In its announcement, the Pentagon says the agreements with the seven AI companies will allow for the “lawful operational use” of their systems, “establishing the United States military as an AI-first fighting force.”