◆ GENERAL · Legal
Judge rules Pentagon's Anthropic risk label unconstitutional
To defend banning Anthropic across the federal government, the Department of War produced four pages. It abandoned its backdoor-access theory in court, conceded Claude is no riskier than any other black box model, and rested the ban on one remaining factor it called trust.
Chandni Melwani
Founder & Editor
Aug 28, 2026 · 2 MIN READ
The News
On August 27, 2026, Judge Rita F. Lin of the Northern District of California granted summary judgment largely for Anthropic in Anthropic PBC v. U.S. Department of War, No. 3:26-cv-01996-RFL, a 59-page opinion. She held that designating Anthropic a national-security supply chain risk, ordering federal agencies to stop using its products and barring defense contractors from doing business with it was unlawful First Amendment retaliation, and that Anthropic was denied the process the Fifth Amendment requires. It is not a clean sweep. Anthropic lost its ultra vires separation-of-powers claim outright, and lost its Section 558 claim as to HHS, Commerce, the VA, the SEC and NASA. The court says declaratory relief, vacatur and a permanent injunction are appropriate, but has not entered them yet.
Know More
- — Ruling: August 27, 2026, per the docket stamp and Judge Lin's signature block. Several outlets report the 28th.
- — Split decision: Anthropic won Counts I (as to Secretary Hegseth and the Department of War), II and IV, and Count V as to nine agencies — in each case excluding the Non-Participating Defendants, who are carved out of Counts II and IV as well as Count V. It lost Count III entirely, and Count V as to HHS, Commerce, VA, SEC and NASA.
- — The record: the court calls it 'slim' — a four-page memorandum that post-dates two of the three challenged actions supplies 'the entirety of the government's rationale.'
- — The concession: Defendants backed away from their backdoor-access theory and conceded Anthropic's technology is 'no riskier to the national security than any other black box artificial intelligence model.'
- — Not final: the opinion says 'an order addressing relief will issue separately.' The government's request to administratively stay the permanent injunction for seven days was denied.
- — Still open: a separate Anthropic challenge to a related designation under a different statute, No. 26-1049, remains undecided in the D.C. Circuit.
Asked to defend banning a company from the entire federal government, the Department of War produced four pages. Judge Rita F. Lin called the administrative record “slim” in her August 27 opinion, noting that the memorandum supplying “the entirety of the government’s rationale” post-dates two of the three actions it was meant to justify.
Washington’s original theory was sabotage: that Anthropic kept backdoor access to its models once they were running inside a national-security system. In litigation the government conceded that no such access exists, and that Claude is “no riskier to the national security than any other ‘black box’” model. That left one factor unique to Anthropic, which Defendants called trust, and they tied it explicitly to the company’s “increasingly hostile manner through the press.” Once the stated reason for a penalty is the target’s speech, the case stops being about national security and becomes a First Amendment case, which is how Lin decided it, alongside a Fifth Amendment finding that Anthropic never got the process it was owed before the penalty landed. The timing did not help the government either: days before the designation, Secretary Hegseth had proposed applying the Defense Production Act to Anthropic, which would have made it essential to national security rather than a threat to it.
Vendors selling AI into government should read the shape of this before the result. Anthropic lost its separation-of-powers claim outright, lost five agencies on its notice claim, and has no entered remedy yet, while a related designation remains undecided in the D.C. Circuit. What a supplier actually gains is procedural: an administrative record that has to survive being read by someone. That matters because this administration has already been intervening in AI litigation directly, building review gates around frontier models, and naming labs in public allegations. The paperwork is where a vendor’s defence now lives, and four pages was not enough of it.
Related
- The Justice Department told a federal judge that Minnesota’s nudification ban sweeps too broadly, without joining the case
- The government now gets a look at the most powerful AI models before the public does
- The White House says Moonshot AI trained its model on Anthropic’s, and accessed restricted Nvidia chips in Thailand
The empty invocation of national security is not a blank check to punish and retaliate against government critics.
Judge Rita F. Lin, N.D. Cal., August 27, 2026
Frequently Asked Questions
Is Anthropic back in business with the federal government?
Not automatically, and not yet on paper. The court held that vacatur and a permanent injunction are appropriate but wrote that an order addressing relief will issue separately, so the operative remedy is still to come. A separate Anthropic challenge to a related designation under a different federal law also remains undecided in the D.C. Circuit, which this ruling does not resolve.
What did Anthropic actually lose?
Its ultra vires separation-of-powers claim, which argued the President had no statutory or constitutional authority to order every federal agency to stop using its technology. The court found Anthropic had not carried its burden on that theory and entered judgment for the government on it. Anthropic also lost its Section 558 claim against HHS, Commerce, the VA, the SEC and NASA, on the ground that the record did not show those agencies had taken a final action.
Has the government said whether it will appeal?
No. No comment from the Department of War or the Justice Department appears in the record of coverage reviewed for this piece, and no notice of appeal has been confirmed. Reporting that the government is expected to challenge the ruling is an expectation, not a filing.
Sources
- Anthropic PBC v. U.S. Department of War, No. 3:26-cv-01996-RFL, Dkt. 250 (N.D. Cal. Aug. 27, 2026) — the 59-page summary judgment opinion; read end to end for the record findings, the count-by-count disposition, the relief section and the denied seven-day stay
- CourtListener docket for Anthropic PBC v. U.S. Department of War — filing dates and document numbers
- NOTUS — reports the pending D.C. Circuit case, Anthropic's statement, and that the Pentagon did not immediately respond to requests for comment; dates the ruling to August 28
- TechCrunch (August 28, 2026) — coverage of the ruling and confirmation that the D.C. suit is still ongoing; also dates the ruling to August 28
Chandni Melwani
Chandni Melwani is the founder and editor of New in AI, covering AI agents, M&A, and enterprise adoption. She holds a Master's in Management of Artificial Intelligence from Queen's University and brings a practitioner's perspective from her work in Data and AI leadership.
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