The entire source code for Anthropic's Claude Code command line interface application (not the models themselves) has been leaked and disseminated, apparently thanks to a serious internal error. The leak gives competitors and armchair enthusiasts a detailed blueprint for how Claude Code works—a significant setback for a company that has seen explosive user growth and industry impact over the past several months.

Early this morning, Anthropic published version 2.1.88 of Claude Code npm package—but it was quickly discovered that package included a source map file, which could be used to access the entirety of Claude Code's source—almost 2,000 TypeScript files and more than 512,000 lines of code.

Security researcher Chaofan Shou was the first to publicly point it out on X , with a link to an archive containing the files. The codebase was then put in a public GitHub repository, and it has been forked tens of thousands of times.

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Building a utility-scale quantum computer that can crack one of the most vital cryptosystems—elliptic curves—doesn’t require nearly the resources anticipated just a year or two ago, two independently written whitepapers have concluded. In one, researchers demonstrated the use of neutral atoms as reconfigurable qubits that have free access to each other. They went on to show this approach could allow a quantum computer to break 256-bit elliptic curve cryptography (ECC) in 10 days while using 100 times less overhead than previously estimated. In a second paper, Google researchers demonstrated how to break ECC-securing blockchains for Bitcoin and other cryptocurrencies in less than 9 minutes while achieving a 20-fold resource reduction.

Taken together, the papers are the latest sign that cryptographically relevant quantum computing (CRQC) at utility-scale is making meaningful progress. The advances are largely being driven by new quantum architectures developed by physicists and computer scientists in a push to create quantum computers that operate correctly even in the presence of errors that occur whenever qubits—the quantum analog to classical computing bits—interact with their environment. The other key drivers are ever-more efficient algorithms to supercharge Shor’s algorithm, the 1994 series of equations proving that quantum computing could break the ECC and RSA cryptosystems in polynomial time, specifically cubic time , far faster than the exponential time provided by today’s classical computers.

Neither paper has been peer-reviewed.

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Someone is celebrating a birthday tomorrow—it's Gmail. The iconic email service debuted 22 years ago on April 1, forever altering what people expected from free email. But 22 years is a long time, and the username you chose when you finally got your hands on an invite in 2004 may not have stood the test of time. Starting today , Google will let US-based users ditch an old username without creating a new account.

Google started testing this option some months ago, both in the US and internationally. Today, the name change feature is rolling out widely in the US. You can check for the option on this account page to get started (you'll have to log in). Some of the accounts we've checked already have the option, but it could take a while for it to appear for everyone.

Over the years, many users have abandoned old Gmail addresses because the handle is too personal or their names have changed. Now, you don't have to abandon anything. When the option appears, you'll be able to change the username portion of your email (the part before @gmail) to anything you desire. However, Google says you can only change your address once every 12 months. The company hasn't explained why you're limited to one change per year, but it may be a measure to combat spam.

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OkCupid and its owner Match Group reached a settlement with the Trump administration for not telling dating-app customers that nearly 3 million user photos were shared with a company making a facial recognition system. OkCupid also gave the facial recognition firm access to user location information and other details without customers' consent, the Federal Trade Commission said.

OkCupid and Match do not have to pay a financial penalty in a deal made with the FTC over an incident from 2014. OkCupid and Match did not admit or deny the allegations but agreed to a permanent prohibition barring them from misrepresenting how they use and share personal data, the FTC said yesterday .

The FTC has been run entirely by Republicans since President Trump fired both Democratic commissioners . The proposed settlement requires approval from a judge and was submitted in US District Court for the Northern District of Texas.

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KENNEDY SPACE CENTER, Fla.—This will be the third time I have observed NASA’s Orion spacecraft take flight. But with this one, for the first time, am I genuinely hopeful about the future of the space agency and its plans to build a station on the surface of the Moon.

The two previous flights, in 2014 and 2022, both felt hollow. NASA, an aging bureaucracy, has repeatedly sought to recapture its fading glory while also looking toward a supposedly brighter future. Agency leaders would say things like this, from then-NASA Administrator Charlie Bolden, after the first Orion launch in 2014: “This is the beginning of the Mars era.”

It wasn’t. No one who was paying attention believed it. But it was the kind of thing you had to say, I guess.

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A proposed class action has accused Costco of unjust enrichment after the retail giant allegedly made customers pay for tariffs, then planned to pocket the full refund after they were deemed unlawful .

Costco "collected the tariff costs from consumers through elevated pricing, while simultaneously seeking refunds of the same tariff payments from the federal government," the complaint alleged. Unless the court intervenes, "Costco stands to recover the same tariff payments twice."

Filed in a US District Court in Washington, the lawsuit points to public statements from Costco executives that customers said made it clear that the company had raised prices on some goods while the tariffs were in effect. But the company has since offered "no legally binding commitment to return tariff-related overcharges to the consumers who actually paid them."

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The Federal Aviation Administration (FAA) requires that, in the event of an emergency, all airplane passengers must be able to evacuate any aircraft within a 90-second window. But is that a realistic requirement, particularly given the increasing number of elderly passengers who might need more time and assistance? According to a new paper published in the journal AIP Advances, it is not. Various simulated scenarios showed evacuation times significantly higher than the 90-second requirement.

This isn't the first time scientists have puzzled over this kind of optimization problem. Back in 2011 , Jason Steffen, now a physicist at the University of Nevada, Las Vegas, became intrigued by the question of the most efficient boarding method; he applied the same optimization routine used to solve the famous traveling salesman problem to airline boarding strategies. Steffen fully expected that boarding from the back to the front would be the most efficient strategy and was surprised when his results showed that strategy was actually the least efficient.

The most efficient, aka the “Steffen method,” has the passengers board in a series of waves. Field tests bore out the results , showing that Steffen’s method was almost twice as fast as boarding back-to-front or rotating blocks of rows and 20–30 percent faster than random boarding. The key is parallelism: The ideal scenario is having more than one person sitting down at the same time.

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KENNEDY SPACE CENTER, Florida—The two-day countdown for the launch of NASA's Artemis II mission began Monday evening, with clocks timed for the first of six opportunities in early April to send a crew of four astronauts around the far side of the Moon.

Liftoff from Launch Complex 39B at Kennedy Space Center in Florida is scheduled for a two-hour launch window opening at 6:24 pm EDT (22:24 UTC) on Wednesday. NASA has backup launch opportunities each day through Monday, April 6, or else the mission will have to wait until the end of the month.

Mission managers said Monday that all systems were looking good for launch this week. The weather forecast is favorable, with an 80 percent chance of acceptable conditions for liftoff Wednesday. The only weather concern at the launch site in Florida is a low chance of rain showers and cloud cover that could present a risk of lightning. But with a two-hour launch window, there should be plenty of time to wait out any scattered storms.

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The Volvo factory outside Charleston, South Carolina, will get even busier this year. Formerly the site that built the S60 sedan, in recent years it shifted to building big electric SUVs, the EX90 and closely related Polestar 3 . Today, Volvo and Polestar announced that Charleston will now be the sole production site for the Polestar 3; until now, it was also being built at a factory in Chengdu, China.

"The move to consolidate global Polestar 3 production in Charleston help[s] generate efficiencies for both companies, whilst also underscoring our confidence in the plant and the role it plays in our manufacturing footprint," said Håkan Samuelsson, chief executive of Volvo Cars. "The US is a very important market for Volvo Cars, both to support our growth ambitions as well as a strategic production site to meet regional and export demands."

Volvo had a challenging 2025, with sales falling by 7 percent. Meanwhile, Polestar, which was spun out from the Swedish OEM's performance arm into a standalone startup in 2017 , had a rather good 2025, seeing a 34 percent increase in sales. So increasing the proportion of Polestar 3s to come out of South Carolina seems sensible.

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