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Meta‘s chief artificial intelligence scientist Yann LeCun has spent much of the past week sparring with Elon Musk over the Tesla CEO’s treatment of scientists and news organizations, and for spreading false conspiracies on social media.

“I like his cars (I own a 2015 S, and 2023 S), his rockets, his solar energy systems, and his satellite communication systems,” LeCun wrote about Musk on Sunday in a Post on X, the social media site that Musk owns. “But I very much disagree with him on a number of issues.”

The spat began days earlier, on May 27, after Musk took to X to encourage people to apply for roles at his AI startup, xAI. The company, which last week announced it had raised $6 billion, is in a battle for AI engineers with high-profile startups, such as OpenAI and Anthropic, as well as top tech companies, including Google, Microsoft, Amazon and Meta.

Meta is trying to differentiate itself in the world of large language models, or LLMs, which have powered the recent boom in generative AI product development. While LLMs from xAI, OpenAI and Google are closed and proprietary for now, Meta is touting its Llama family of models as open source, meaning other researchers can copy, tweak or otherwise use them for their own AI initiatives.

In response to Musk’s promotional post, LeCun wrote, “Join xAI if you can stand a boss who makes promises that can’t be met, claims AI will ‘kill everyone’ and spews wild ‘conspiracy theories on his own social platform.'”

They continued going at it on Monday after Dr. Anthony Fauci testified publicly for the first time since leaving the government in 2022. Fauci appeared before the House Select Subcommittee on the Coronavirus Pandemic, facing broad criticism from Republicans who have long claimed he lied about the genesis of Covid-19.

Musk, who has previously called for the prosecution of Fauci, posted on X, “Why do Dems love Fauci so much.” He also unfollowed LeCun.

In response to being unfollowed, LeCun wrote, “Must have been my tweet in defense of Anthony Fauci.”

He followed by writing, “Elon’s call for Fauci to be prosecuted and imprisoned is pretty high up on the scale of anti-science a–holery.”

While Musk and Meta CEO Mark Zuckerberg have engaged in a yearslong public dispute and were even goading each other for months last year about a possible cage match, few tech leaders have been willing to criticize Musk in the open or bet against his companies.

Microsoft co-founder Bill Gates previously shorted Tesla stock. Investor Mark Cuban criticized Musk over his opposition to corporate Diversity, Equity, and Inclusion (DEI) efforts. And Meta co-founder Dustin Moskovitz has accused Tesla of consumer fraud.

In posts on X and LinkedIn over the weekend, LeCun said he disagrees with Musk’s secrecy when it comes to developing new technology and products and the “blatantly false” predictions he shares with the public, in addition to how he chooses to share “dangerous political opinions” and conspiracy theories.

Musk said in a post on X Monday that LeCun has been “out of touch with AI for a long time.” A Google Scholar link shared by LeCun indicates he has published 80 technical papers since January 2022.

LeCun and Musk didn’t respond to requests for comment on Monday.

The “blatantly false” predictions LeCun referenced included Musk’s claims that artificial general intelligence would arrive next year and that Tesla would bring 1 million robotaxis to market by 2020.

The latter promise came on a call with investors in 2019. At the time, Musk said robotaxis would make Tesla a company worth $500 billion. Tesla’s market cap topped $1 trillion in 2021, but the company still hasn’t delivered a single robotaxi.

Musk has also shared lofty goals for his brain implant startup Neuralink. He’s claimed Neuralink’s devices could enable “superhuman cognition” and “solve” autism and schizophrenia. During a “show and tell” recruitment event in late 2022, Musk said he plans to get an implant himself.

The company has implanted its flagship system in one human patient so far and has not received FDA approval for its technology.

LeCun was also critical of how Musk takes credit for the work of others. He pointed out that Musk’s only technical publication on Google Scholar is related to Neuralink. It was published in the Journal of Medical Internet Research in 2019. Musk is listed as the lead author, while the blanket term “Neuralink” is listed as the second author.

“I’m sure the scientists who hide behind this collective name are super happy about that,” LeCun said on X. “I just hope they won’t die bitter and forgotten.”

WATCH: Musk and Trump to team up?

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CNBC Daily Open: AI still under pressure — but some analysts see a year-end rally

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CNBC Daily Open: AI still under pressure — but some analysts see a year-end rally

People pose for pictures at the Wall Street Bull in New York’s Financial District on June 24, 2024 in New York City. 

Spencer Platt | Getty Images

The Nasdaq Composite dropped 0.84% Monday stateside as technology stocks were under pressure, with Apple, Meta and Oracle retreating more than 1% each.

Artificial intelligence lynchpin Nvidia performed worse, losing almost 2%. CEO Jensen Huang in October said the chipmaker had “half a trillion dollars” of business on the books for 2025 and 2026. When Nvidia reports its third-quarter earnings Wednesday stateside, investors will be combing through Huang’s comments for signs of strong 2026 growth, as suggested by that data point.

The problem with promises or expectations, especially for a company that is one of the two around which the artificial intelligence universe orbits (OpenAI being the other), is that any disappointment will be disproportionately painful.

“If they offer any even slightly muted guidance or forecast for demand for their chips, the market would take that poorly,” Baird investment strategist Ross Mayfield said.

Despite the recent sell-off in tech over concerns about high valuations and capital expenditure, some analysts think we could still end the year with a rally.

 “We continue to see a balance of bullish and bearish signals heading into year-end, but our stance remains that a year-end rally is likely,” Michael Graham, analyst at Canaccord Genuity, wrote in a Monday note.

Likewise, HSBC’s chief multi-asset strategist Max Kettner on Monday said the bank thinks “the probability of a melt-up into year-end – particularly in equities – is much greater” than a potential AI bubble popping.

If their predictions prove true, investors will have much to celebrate during the festive season — and we can worry about AI in the new year.

What you need to know today

Major U.S. indexes fall Monday stateside. Investors sold off technology names, furthering their downward trajectory. Alphabet shares, however, bucked the trend on news that Berkshire Hathaway has taken a stake in it. The pan-European Stoxx 600 lost 0.54%.

‘Half a trillion dollars’ of business for Nvidia. CEO Jensen Huang said in October that the chipmaker has $500 billion in orders for 2025 and 2026 combined. Analysts think Huang is signaling a strong forecast for 2026 sales.

Divided outlook on a December rate cut. In prepared remarks on Monday, Fed Governor Christopher Waller said he is focused on the labor market “after months of weakening.” But Vice Chair Philip Jefferson said there is a “need to proceed slowly.”

India announces energy deal with the U.S. Nearly 10% of New Delhi’s liquified petroleum gas will be imported from the U.S., said Hardeep Singh Puri, Indian union minister of petroleum and natural gas, on Monday. It’s a move to shore up ties with the White House.

[PRO] Bitcoin’s downward trend could portend trouble. The price of the cryptocurrency, which has been under pressure, is a “leading indicator” for U.S. stocks, an analyst told CNBC. But others think bitcoin still has tailwinds behind it even in the near term.

And finally…

A Swiss national flag on a ferry on Lake Geneva in Geneva, Switzerland, on Tuesday, Aug. 5, 2025. The Swiss president dashed to the US capital Tuesday in a last-minute attempt to prevent her American counterpart from imposing the highest tariff of any developed nation on Switzerland.  Photographer: Andrew Kravchenko/Bloomberg via Getty Images

Bloomberg | Bloomberg | Getty Images

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Arm custom chips get a boost with Nvidia partnership

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Arm custom chips get a boost with Nvidia partnership

Jensen Huang, CEO of Nvidia, reacts during the 2025 Asia-Pacific Economic Cooperation (APEC) CEO Summit in Gyeongju, South Korea, October 31, 2025.

Kim Soo-hyeon | Reuters

Arm on Monday said that central processing units based on its technology will be able to integrate with AI chips using Nvidia’s NVLink Fusion technology.

The move will make it easier for customers of both companies who prefer a custom approach to their infrastructure — namely hyperscalers —to pair Arm-based Neoverse CPUs with Nvidia’s dominant graphics processing units.

It’s the latest example of Nvidia using dealmaking to partner with nearly every major technology company as it finds itself at the center of the AI industry. The announcement signals that Nvidia is opening up its NVLink platform to integrate with a wide variety of custom chips, instead of forcing customers to use its CPUs.

Nvidia currently sells an AI product called Grace Blackwell that pairs multiple GPUs with an Nvidia-branded Arm-based CPU. Other configurations include servers that use CPus from Intel or Advanced Micro Devices.

But Microsoft, Amazon and Google are all developing or deploying Arm-based CPUs in their clouds to give them more control over the set ups and reduce their costs.

Arm doesn’t make CPUs but it licenses its instruction set technology that those chips need. The company also sells designs that allow partners to more quickly build Arm-based chips.

As part of Monday’s announcement, Arm said that custom Neoverse chips will include a new protocol that’ll allow them to move data seamlessly with GPUs.

The CPU has historically been the most important part in a server. But generative AI infrastructure is based around the AI accelerator chip, which in most cases is an Nvidia GPU. As many as eight GPUs can be paird with a CPU in an AI server.

In September, Nvidia said it would invest $5 billion into Intel, the leading CPU maker. A key part of the deal was to enable Intel CPUs to integrate into AI servers using Nvidia’s NVLink technology.

Nvidia reached an agreement to buy Arm for $40 billion in 2020, but the deal failed in 2022 because of regulatory issues in the U.S. and U.K. Nvidia had a small stake in Arm, which is majority-owned by Softbank, as of February.

Meanwhile, Softbank liquidated its entire stake in Nvidia earlier this month and Softbank is backing the OpenAI Stargate project, which plans to use Arm technology in addition to chips from Nvidia and AMD.

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Nvidia's options pricing can swing 6-7% in either direction, says Susquehanna's Murphy

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Govini founder Eric Gillespie’s lawyer calls child sex chat ‘internet fantasy,’ not a crime

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Govini founder Eric Gillespie's lawyer calls child sex chat 'internet fantasy,' not a crime

Govini founder Eric Gillespie urged a person who he believed to be a dad offering his 10-year-old daughter to be sexually abused to use encrypted chat platforms, a Pennsylvania criminal complaint alleges.

“Signal is safer for er small talk,” Gillespie wrote to the purported father, who was actually an undercover law-enforcement agent, according to a transcript of a chat included in the criminal complaint obtained by CNBC.

Gillespie then wrote that Session, another commonly used end-to-end encrypted platform, is “fine but less secure” than Signal, the filing says.

While chatting in Session, he sent the agent multiple photos of a “recent playmate” wearing a diaper and made repeated graphic references to sex acts with children, court documents state.

Gillespie also wrote that he preferred young children: “best when they can’t talk.”

The charging documents note that users can delete media and messages sent in Session, and because of that, the agent could not get screenshots of media files sent by Gillespie.

The Pennsylvania Office of Attorney General said that the chat with the agent began in an online forum often used by people attempting to arrange meetings with children.

The men then moved their discussion to Session, according to the AG’s office, which last week said it had arrested and charged Gillespie with four felony counts, including unlawful sexual contact with a minor.

He is being held without bond.

His arrest came at a pivotal time for Govini, a defense contractor that is a key player in the U.S. military’s push to modernize.

Gillespie’s lawyer, David Shrager of Shrager Defense Attorneys, told CNBC that he “vigorously denies these charges.”

“In this case, two adults were lying to each other in an internet fantasy chat, where at least one of the participants was using AI,” Shrager said.

The criminal complaint notes that at one point in the conversation, the agent sent “A photo media file of an undercover female Agent age regressed with AI technology to appear approximately 10 years of age.”

That is the only mention of the use of artificial intelligence in the complaint.

“It’s easy to understand why people rush to judgment when they hear about these types of charges,” Shrager told CNBC.

The attorney said that he believes Gillespie will be exonerated.

Gillespie is scheduled to appear at a preliminary hearing on Thursday before Magisterial District Judge John Ditzler in Lebanon County, Pennsylvania.

Govini last week called Gillespie a “depraved individual” in a statement announcing his termination as executive chairman of the company’s board of directors.

Govini said that Gillespie “has no role with the company and is not a majority shareholder.”

“Since being terminated, he will not receive a paycheck,” the company said.

The company did not disclose the current level of Gillespie’s stake in Govini.

Earlier this year, Govini landed a nearly $1 billion contract with the Department of Defense and joined the U.S. Army’s Next Generation Command Control program.

In October, Govini announced a $150 million investment from Bain Capital.

Bain declined to comment on Gillespie’s arrest.

Gillespie was quoted prominently in a news release about Bain’s investment.

“I founded Govini to create an entirely new category of software built to transform how the U.S. government uses AI and data to make decisions,” Gillespie said at the time. “After methodically developing our proprietary technology, that vision is now a reality.”

Accel and Salesforce Ventures are also major investors in Govini. Neither company has responded to requests for comment.

Multiple people familiar with Govini, and who had personal contact with Gillespie, said that he had an active role at the company. Documents and text messages reviewed by CNBC support that claim.

One person, who asked not to be named in order to discuss internal communication, described Gillespie as the point man for key financial dealings.

In a statement responding to questions about his day-to-day involvement at the company, Govini said, “Mr. Gillespie had opinions and ideas and did not hesitate to share them.”

“In his capacity as Executive Chairman, he was aware of and consulted on the operations of the leadership team,” the company said.

Pentagon officials last week said that they are looking into Gillespie’s arrest and possible security issues.

CNBC asked the department if it is looking at possible actions related to the company’s status as a government contractor.

“While the Department cannot comment on individual security clearances in accordance with the Privacy Act, we take these allegations very seriously,” a senior Pentagon official said in a statement.

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