United States · Business and Corporate Law · Civil Litigation
A judge struck down the government's Anthropic ban. What it means if you're a federal contractor
If your company works for the military and uses Claude, the order that barred you from doing any business with Anthropic has been canceled. A second label calling Anthropic a security risk is still before an appeals court, so Department of War contract work is not settled yet.
At a glance
The practical result
- Court
- N.D. Cal., Judge Rita F. Lin
- Outcome
- Judge ruled largely for Anthropic
- Law
- First and Fifth Amendments, federal agency rules law (APA), 10 U.S.C. § 3252
- Immediate effect
- Contractor boycott order canceled
In this article
- What the court decided in the Anthropic Pentagon case
- What the government restriction covered
- How the case got here
- Why the court found a legal problem
- What changes for you as a contractor
- What AI vendors and contractors should review
- What happens next in the Anthropic lawsuit
- Your questions about the Anthropic ruling
Short answer: On August 27, 2026, a federal judge in San Francisco ruled for Anthropic in its lawsuit against the Pentagon (now called the Department of War). She canceled the order that no military contractor could do any business with Anthropic, along with the other February 2026 actions against the company. The court vacated that order, so it has no legal effect unless an appeals court revives it. But a second label calling Anthropic a security risk, made under a different law, is still before a federal appeals court in Washington, D.C., and the government can still appeal. This is general information, not legal advice.
What the court decided in the Anthropic Pentagon case
U.S. District Judge Rita F. Lin of the Northern District of California ruled for Anthropic on most of its claims on August 27, 2026. She decided the case on the written record, without a trial, because the key facts were not in real dispute. She entered a final order and judgment the same day, ending the case in her court. It is one of four rulings in August 2026 that tested how far the government can go.
The judge declared that the government's actions punished Anthropic for its public statements, which the First Amendment forbids. She also found that the Fifth Amendment entitled Anthropic to fair notice and a chance to respond before being cut off, and it got neither. She permanently barred the agencies that took part from carrying out those actions in any way, and ordered them to withdraw the instructions they had issued to put them in place.
Anthropic did not win everything. The judge rejected its claim that the President overstepped the powers the Constitution gives him, and some claims against HHS, Commerce, the VA, the SEC and NASA. She also refused the government's request to put her order on hold for seven days. Cases like this one, where a business asks a court to stop a government action, are handled by civil litigation lawyers.
What the government restriction covered
The court reviewed three actions. On February 27, 2026, President Trump posted on Truth Social that he was directing every federal agency to "IMMEDIATELY CEASE all use of Anthropic's technology," with a six-month phase-out for agencies such as the Department of War. A little over an hour later, Secretary of War Pete Hegseth posted on X that "no contractor, supplier, or partner that does business with the United States military may conduct any commercial activity with Anthropic." Then, in a March 3 determination and a letter Anthropic received on March 4, the Department formally labeled Anthropic a supply chain risk under 10 U.S.C. § 3252, a law that lets the military shut out suppliers who might sabotage its systems.
According to the court's opinion, the dispute began when Anthropic refused to drop contract limits on using Claude for mass surveillance of Americans and lethal autonomous warfare. A March 5 memo from the Department's Chief Information Officer told its offices to remove Anthropic products from all Department systems within 180 days and said the ban applied to all contracts with the military's suppliers, current and future.
- $200M
- ceiling of Anthropic's July 2025 defense AI agreement
- 180 days
- window the March 5 memo gave to remove Claude
- 100+
- enterprise customers who asked Anthropic about the ban
How the case got here
The President orders agencies to stop using Anthropic, and Secretary Hegseth bars military contractors from any business with it.
Secretary Pete Hegseth signs supply chain risk decisions under two laws, 10 U.S.C. § 3252 and 41 U.S.C. § 4713.
Anthropic sues in San Francisco and asks the federal appeals court in Washington, D.C. to review the § 4713 label.
Judge Lin temporarily blocks the three challenged actions while the case goes on.
The government appeals the preliminary injunction to the Ninth Circuit, which later pauses the appeal.
The appeals court in Washington, D.C. refuses to pause the § 4713 label while it reviews the case.
The appeals court in Washington, D.C. hears argument on the § 4713 label.
Judge Lin rules for Anthropic, permanently blocks the actions and cancels the § 3252 label.
Last day for the government to file a notice of appeal from the final judgment.
Why the court found a legal problem
Supply chain risk. Section 3252 defines supply chain risk as "the risk that an adversary may sabotage, maliciously introduce unwanted function, or otherwise subvert" a national security system. The judge read that as aimed at covert acts or hacks, "not overt, public positions regarding contract terms." She found no concrete reason to suspect Anthropic would sabotage its model, and found it undisputed that Anthropic cannot access or control its models once they are deployed.
The contractor boycott. The government admitted that no law allowed the order telling military contractors to stop all business with Anthropic, and did not defend it. The judge vacated it, meaning she canceled it as if it had never been issued.
Speech and fair process. The judge found that the government acted to make "a public example out of Anthropic" for criticizing it, not because of a real sabotage risk. She pointed out that days before the label, Secretary Hegseth had proposed using the Defense Production Act on Anthropic, and that afterward the Department kept negotiating, with Under Secretary Emil Michael writing "I think we are very close here." She also found that Anthropic was cut off without adequate notice or a chance to respond first. A day later, another federal judge in Northern California issued a First Amendment ruling against federal officials in the Stanford Daily case on noncitizens' free speech rights.
| Government action | What the August 27 order did |
|---|---|
| Presidential Directive to stop all federal use | Declared unconstitutional. The agencies that took part cannot carry it out. |
| Hegseth order barring contractors from any business with Anthropic | Canceled, and the agencies are barred from carrying it out. |
| Supply chain risk label under 10 U.S.C. § 3252 | Canceled and sent back to the Department. |
| Nine agencies' steps to carry out the directive | Canceled: agencies punished Anthropic without legal power to do so. |
| Supply chain risk label under 41 U.S.C. § 4713 | Not part of this case. Still before the appeals court in Washington, D.C. |
What changes for you as a contractor
The biggest change is for companies that work for the military and also use Claude somewhere else. The Hegseth order would have forced them to drop Anthropic entirely, even for work that had nothing to do with the military. The court vacated that order, so it has no legal effect unless an appeals court revives it. The court found that before it first blocked the actions on March 26, some defense contractors had started to end their reliance on Anthropic, and one Anthropic partner moved a Food and Drug Administration contract to a competing model.
Work on Department of War contracts is different. In its April 8 order refusing to pause the § 4713 label, the appeals court in Washington, D.C. said the Department had "prohibited its other contractors from using Anthropic as a subcontractor on work performed for the Department," but had not barred contractors from using Claude for other customers. The government told that court on September 3 that the § 4713 label is a separate action with a different reach. FedScoop reported on September 4 that Under Secretary Michael said Anthropic "is still a designated supply chain risk" at the department and among the military's suppliers.
Sorting out which of your contracts this touches means reading the actual clauses. Lawyers who practice government and municipal law handle disputes with agencies, and business and corporate lawyers can review how your own supplier and customer agreements are affected.
| Your situation | Where things stand |
|---|---|
| You use Claude for commercial or non-military customers | Canceled by the court: the order barring all business with Anthropic has no legal effect unless an appeals court revives it. |
| You use Claude on a civilian agency contract | Canceled by the court: the agencies that took part cannot carry out the directive, but can still choose vendors lawfully. |
| You use Claude on Department of War contract work | Not settled yet: the § 4713 label and its subcontractor limits are still under review. |
| Your contract carries a clause added to carry out the ban | Not settled yet: agencies must withdraw their instructions, but check what your contracting officer has put in writing. |
| Your contracts involve other AI vendors | Not covered: the ruling addresses only the actions taken against Anthropic. |
What AI vendors and contractors should review
If you hold federal contracts and use Claude or build on it, check these five things first. This is general information, not legal advice, and your own contract terms control.
- Contract clauses: find any clause or modification added after February 27, 2026 that restricts Anthropic products, and note which agency added it.
- Contracting officer notices: collect every written instruction about Anthropic and ask whether it has been rescinded since August 27.
- Department of War work: map where Claude is used on Department contracts or subcontracts, since the § 4713 label still applies there.
- Non-military work: confirm that commercial and civilian work using Claude is kept separate from Department of War deliverables.
- Deadlines: track October 26, 2026, the last day for the government to appeal, and any ruling on the § 4713 label.
What happens next in the Anthropic lawsuit
Three things are still open. First, the government has 60 days from the August 27 judgment to appeal to a higher court, which makes October 26, 2026 the deadline. We did not find a notice of appeal on the public docket, and FedScoop quoted a law professor saying an appeal is "all but certain." Second, the government's earlier appeal of the March 26 order is paused in the Ninth Circuit while the Washington, D.C. case plays out.
Third, Judges Karen Henderson, Gregory Katsas and Neomi Rao of the appeals court in Washington, D.C. heard argument on the § 4713 label on May 19, 2026 (No. 26-1049) and asked for extra written arguments, including on a June 3 decision by Secretary Hegseth on reconsidering the label. At argument, Judge Henderson called it "a spectacular overreach by the department," but comments at argument do not decide a case, and the panel has not ruled. Anthropic says the August 27 findings should bind the government there; the government disagrees. If you need someone to look at your own contracts, our guide to choosing a lawyer lists the questions worth asking first, and our team can help you find one.
Your questions about the Anthropic ruling
Did the court permanently end the Anthropic restriction?
It permanently blocked the Presidential Directive, the Hegseth order and the § 3252 label for the agencies that took part. The separate § 4713 label is still before the appeals court in Washington, D.C., and the government can appeal until October 26, 2026.
Why did the Pentagon label Anthropic a supply chain risk?
The Department said Anthropic's contract limits on mass surveillance and autonomous weapons amounted to an operational veto, and that the company had turned hostile in the press. The court found no concrete reason to suspect sabotage and concluded the label was meant to punish Anthropic for criticizing the government.
Which federal contractors could be affected?
Companies that do business with the military and also use Anthropic's products elsewhere gain the most, because the order barring all business with Anthropic is canceled. Contractors using Claude on Department of War work still face the § 4713 label.
Does the order apply to all AI vendors?
No. It addresses only the actions taken against Anthropic. It does not change how agencies choose other AI vendors or require any agency to buy Anthropic's products.
Can the government appeal?
Yes. Because federal agencies are parties, the government has 60 days after the August 27 judgment to file a notice of appeal to the Ninth Circuit.
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