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Plus, a ton of Apple updates.

Anthropic accidentally revealed its next model—and it sounds like a big one. A draft blog post left in a publicly accessible data cache disclosed that the company has been testing a new model internally codenamed Mythos, describing it as "by far the most powerful AI model we've ever developed." Anthropic confirmed the leak to Fortune and acknowledged the model is being trialed with early access customers, calling it "a step change" in AI performance.

The draft blog post describes Mythos (also seemingly referred to internally as Capybara) as dramatically outperforming Opus 4.6 on coding, reasoning, and cybersecurity—and flags that last one as a concern, describing the model as "currently far ahead of any other AI model in cyber capabilities." (which is already affecting cybersecurity stocks). Anthropic attributed the leak to “human error” in its content management system—and says the model is expensive to run and not yet ready for general release.

Also in today's newsletter:

  • A federal judge blocked the Pentagon's Anthropic blacklist—at least for now.
  • The postal service has been quietly selling you out for over 30 years.
  • Why Lockdown Mode could be the best thing for your iPhone.

—Carlin Maine, Whizy Kim, and Saira Mueller

THE DOWNLOAD

Anthropic and Pentagon logos

Morning Brew Design

TL;DR: A federal judge temporarily blocked the Pentagon’s blacklisting of Anthropic, calling it “classic illegal First Amendment retaliation.” The government’s own documents undercut its case, and Anthropic argued it has already suffered damages in the hundreds of millions because of this whole fiasco. But this preliminary injunction isn’t the last word—and who ultimately wins is still very much up in the air.

What happened: Yesterday, a federal judge in California blocked the government from enforcing its blacklist of Anthropic using a supply chain risk label—at least for now. Judge Rita Lin wrote in her order that “nothing in the governing statute supports the Orwellian notion that an American company may be branded a potential adversary and saboteur of the US for expressing disagreement with the government.”

Much of the hearing centered on a post Defense Secretary Pete Hegseth made on X declaring that no military “contractor, supplier, or partner” could conduct “any commercial activity” with Anthropic. It took a federal judge to clarify that no, the designation doesn’t apply to a company whose only military connection is selling the Pentagon toilet paper. The government’s own lawyer conceded during the oral argument that the post had “absolutely no legal effect at all.”

A quick recap: In January, Hegseth issued a memo demanding all military AI vendors grant the Pentagon “any lawful use” of their technology. But Anthropic had two red lines—no mass domestic surveillance, no fully autonomous weapons. The dispute went public in late February, and the Pentagon slapped Anthropic with a supply chain risk designation reserved for foreign adversaries in early March.

The damage report: Anthropic argues that the ambiguity the government created with all of this has already cost the company $180 million in collapsed deals. Over 100 enterprise customers expressed “deep fear, confusion, and doubt” following the supply chain risk designation. Anthropic CFO Krishna Rao estimated the actions could cost it up to billions of dollars in 2026 revenue—noting that spooked customers drive away investors, and without investor capital, Anthropic can’t buy the compute it needs to stay in the AI race.

Threat or asset?: Court filings revealed that the day after designating Anthropic an “unacceptable national security threat” (but before it notified the company), Defense Under Secretary Emil Michael emailed Anthropic CEO Dario Amodei about contract terms, saying, “I think we are very close here.” Lin called this exchange “exceedingly difficult to square” with the government's simultaneous characterization of Anthropic as “hostile” and posing an “intolerable” risk.

Lin also flagged that Hegseth had told Anthropic he’d either label it a supply chain risk—a grave threat to national security—or invoke the Defense Production Act to compel it as essential to national security. She said this contradiction showed a “complete lack of prior notice or process” from the Pentagon.

The bottom line: One legal document filed in support of Anthropic described the Pentagon’s designation as “attempted corporate murder.” The judge’s reply during the hearing: “I don’t know if it’s murder, but it looks like an attempt to cripple Anthropic.” Lin put her ruling on hold for seven days so the government can challenge it, and a final verdict could be months out. —WK

Presented By Wispr Flow

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The internet’s most unnecessary click

You know that feeling when a tiny annoyance somehow feels way bigger than it should? Tech Brew reader Bill from Framingham, Massachusetts, has beef with a small online hassle—which in the grand scheme of tech problems, probably lands somewhere between “mild inconvenience” and “why is this still a thing in 2026?” But it’s the kind of bother that may quietly chip away at your patience once you notice it.

Many web pages require the user to enter information in a text field immediately when they are displayed. Examples include user ID on a login page, an account number on a bank’s page, or a phone number for two-factor authentication. Before users can type the required information, they must first move the mouse to that field and click in it. Why, then, does the web developer NOT put the text insert cursor into that field when the page is displayed?

Imagine a world where your cursor is already where it needs to be. At the very least, wrists and index fingers everywhere would get a well-deserved break. It’s not the biggest issue in tech, but we definitely wouldn’t be mad if someone fixed it. Until then, we’ll keep doing that extra click (whether we like it or not). —CM

Together With Tello

THE ZEITBYTE

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Morning Brew Design, Photo: Adobe Stock

You probably think of the United States Postal Service as a chronically underfunded, increasingly expensive, frustratingly glacial service trying to fend off the final KO from FedEx and UPS. But there’s another way that your postal experience has been ens–ttified over the last several decades: MyMove, the site USPS sends you to when you need to change your address—instead of just filling out a postcard or going to a post office in person.

MyMove is a private company that has held an exclusive contract to run USPS's online change-of-address and voter registration services for over 30 years. It’s supposed to be a win-win for the government: It doesn't spend a dime, while MyMove shares some of the money it makes by selling your new address to advertisers. For the 24 million people who move every year, the firm has turned the experience of an address change into an online hell of unskippable ads, deceptive button placements, and other internet “dark patterns” designed to ensure you can check out any time you like but can never leave. It’s also the reason your mailbox fills with junk before you’ve even unpacked your kitchen utensils.

If you try to register to vote through the site, it’ll redirect you to page after page of Xfinity internet plans and home security offers with no skip button in sight. At the end of this gauntlet of advertisements for unwanted products, it sends an email—telling you to print out a form, fill it out, and physically mail it.

In 1997, the “inventor of the internet” himself praised this kind of public-private partnership as an example of government innovation. But a whistleblower alleged in 2020 that MyMove was skimming the USPS’s cut by secretly deducting its own costs first. Your tax dollars didn’t pay for this service—but maybe they should have. —WK

Chaos Brewing Meter: /5

Together With Prime Video

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Readers’ most-clicked story was about a humanoid robot, which was hired to entertain diners at a restaurant, drifting too close to a table midperformance and sending chopsticks flying (watch the chaos here).

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