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The planned September completion would turn a dispute over military-use limits into a broader test of the Pentagon’s multi-model strategy.
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The Defense Department says it has moved roughly 90% of its classified AI workloads off Anthropic and expects to complete the remaining migration by the end of September 2026. The shift follows a failed contract dispute over Anthropic’s proposed restrictions on mass surveillance and fully autonomous lethal weapons, followed by the Pentagon’s supply-chain-risk designation.
Maven Smart Systems and Palantir-related work reportedly left Anthropic months ago; the remaining classified workload is the final migration phase.
Anthropic sought safeguards for mass surveillance of U.S. citizens and fully autonomous lethal weapons; the Pentagon rejected contractual use limits.
The Pentagon says vendor diversity reduces dependence on a single frontier model provider and preserves mission flexibility.
The Pentagon wanted AI software it could use for all lawful purposes without contractual limits. It now says it has shifted about 90% of its classified AI workloads away from Anthropic and expects to finish the transition by the end of September.
The update, from Under Secretary of Defense for Research and Engineering Emil Michael, puts a date on a rapid break that had already reached deeply into military AI systems. Michael said all Maven Smart Systems or Palantir work had moved away from Anthropic months earlier, leaving the remaining classified workload as the final part of the shift.
The transition followed a breakdown in negotiations over how Anthropic’s models could be used. Anthropic sought contract safeguards restricting uses connected to mass surveillance of U.S. citizens and fully autonomous lethal weapons systems. The Defense Department rejected those terms, arguing that defense software needed to be available for all lawful purposes in an unconstrained way, and later designated Anthropic a national-security supply-chain risk.
Emil Michael said about 90% of classified AI workloads had moved away from Anthropic models.
The Defense Department said it was on track to complete the transition by the end of September.
Michael has framed the move as more than a replacement exercise. The Pentagon is pursuing a multi-model system that uses different frontier AI vendors across missions and security environments. DefenseScoop reported that the mix includes OpenAI, Google and xAI, while the suppliers, deployment methods and security levels can differ by workspace.
Michael’s argument is that relying on one model creates its own military risk. If a sole supplier falls behind the frontier, he said, warfighters could be left in a suboptimal position. A broader vendor mix, in that view, lets the department choose models with different attributes as the field changes.
The migration is proceeding while the underlying conflict remains in court. Michael said a D.C. Circuit case involving the supply-chain-risk designation was still pending, and he expected movement within a month or two. The legal process therefore remains separate from the department’s immediate effort to remove Anthropic from classified work.
That separation is the central consequence of the September deadline. The Pentagon is trying to build a classified AI environment that does not depend on a provider willing to impose use restrictions, while Anthropic’s challenge to the government’s response continues on a different track.
Editorial analysis
The reported migration makes model diversification more than a procurement preference for the Pentagon. It is becoming a hedge against both supplier disputes and rapid changes in model capabilities. But moving workloads is not the same as proving that a multi-vendor system works better in sensitive settings. The next concrete tests are whether the department meets its September target and how its pending court fight with Anthropic develops. Those outcomes will show whether the Pentagon can separate its operational AI plans from the legal dispute that prompted the break.
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