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OpenAI co-founder Ilya Sutskever said Tuesday that he’s leaving the Microsoft-backed startup.

“I am excited for what comes next — a project that is very personally meaningful to me about which I will share details in due time,” Sutskever wrote in an X post on Tuesday.

The departure comes months after OpenAI went through a leadership crisis in November involving co-founder and CEO Sam Altman.

In November, OpenAI’s board said in a statement that Altman had not been “consistently candid in his communications with the board.” The issue quickly caqme to look more complex. The Wall Street Journal and other media outlets reported that Sutskever came to focus on ensuring that artificial intelligence would not harm humans, while others, including Altman, were eager to push ahead with delivering new technology.

Almost all of OpenAI’s employees signed an open letter saying they would leave in response to the board’s action. Days later, Altman was back at the company, and board members Helen Toner, Tasha McCauley and Sutskever, who had voted to oust Altman, were out. Adam D’Angelo, who had also voted to push out Altman, stayed on the board.

When Altman was asked about Sutskever’s status on a Zoom call with reporters at the time, he said there were no updates to share. “I love Ilya… I hope we work together for the rest of our careers, my career, whatever,” Altman said. “Nothing to announce today.”

On Tuesday, Altman shared his thoughts as Sutskever leaves.

“This is very sad to me; Ilya is easily one of the greatest minds of our generation, a guiding light of our field, and a dear friend,” Altman wrote on X. “His brilliance and vision are well known; his warmth and compassion are less well known but no less important.” Altman said research director Jakub Pachocki, who has been at OpenAI since 2017, will replace Sutskever as chief scientist.

OpenAI has announced new board members, including former Salesforce co-CEO Bret Taylor and former Treasury Secretary Larry Summers. Microsoft obtained a nonvoting board observer position.

In March, OpenAI announced its new board and the wrap-up of an internal investigation by U.S. law firm WilmerHale into the events leading up to Altman’s ouster. Altman rejoined OpenAI’s board, and three new board members were announced: Dr. Sue Desmond-Hellmann, former CEO of the Bill and Melinda Gates Foundation; Nicole Seligman, former EVP and Global General Counsel of Sony and President of Sony Entertainment; and Fidji Simo, CEO and Chair of Instacart.

The three new members will “work closely with current board members Adam D’Angelo, Larry Summers and Bret Taylor as well as Greg, Sam, and OpenAI’s senior management,” according to a company release in March.

News of Sutskever’s departure comes a day after OpenAI launched a new AI model and desktop version of ChatGPT, along with an updated user interface, the company’s latest effort to expand use of its popular chatbot.

The update brings the GPT-4 model to everyone, including OpenAI’s free users, technology chief Mira Murati said Monday in a livestreamed event. She added that the new model, GPT-4o, is “much faster,” with improved capabilities in text, video and audio. OpenAI said it eventually plans to allow users to video chat with ChatGPT. “This is the first time that we are really making a huge step forward when it comes to the ease of use,” Murati said.

In 2015, Altman and Tesla CEO Elon Musk, another OpenAI co-founder, wanted Sutskever, then a research scientist at Google, to become the budding startup’s top scientist, according to the lawsuit Musk filed against OpenAI in March.

“Dr. Sutskever went back and forth on whether to leave Google and join the project, but it was ultimately a call from Mr. Musk on the day OpenAI, Inc. was publicly announced that convinced Dr. Sutskever to commit to joining the project as OpenAI, Inc.’s Chief Scientist,” the legal filing said.

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CNBC Daily Open: Investors find cheer amid Fed’s hawkish cut

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CNBC Daily Open: Investors find cheer amid Fed's hawkish cut

Federal Reserve Chair Jerome Powell reacts while speaking during a press conference following the Federal Open Markets Committee meeting at the Federal Reserve on Dec. 10, 2025 in Washington, DC.

Chip Somodevilla | Getty Images

It ended up being a “hawkish cut,” as expected. Still, investors managed to find a few gifts tucked between the lumps of coal.

Even though the U.S. Federal Reserve lowered interest rates on Wednesday stateside, two regional bank presidents — Jeffrey Schmid of Kansas City and Austan Goolsbee of Chicago — wanted rates to stand pat.

Their cautioned was echoed in the Fed’s “dot plot” of rate projection, which showed officials penciling in just one cut in 2026 and another for 2027.

Even the Fed’s rate statement was repurposed from the December 2024 meeting, which ushered in a nine-month period without cuts until September this year.

Why, then, did U.S. markets rise after the meeting?

The biggest surprise was the Fed’s announcement that it would begin purchasing $40 billion in Treasury bills, starting Friday. That move increases the money supply in the economy. In other words, it’s a stealthy way to ease conditions, which helps support financial markets.

Next, Chair Jerome Powell dismissed speculation about future hikes.

“I don’t think that a rate hike … is anybody’s base case at this point,” Powell said. “I’m not hearing that.”

Fed officials also see the U.S economy as remaining resilient. Collectively, they increased their forecast for economic expansion in 2026 to 2.3% from an earlier estimate of 1.8% in September.

“We have an extraordinary economy,” said Powell.

And the markets may be setting up for an extraordinary finish to the year.

“The last interest rate decision of 2025 has essentially paved the way for a Santa Claus rally to end the year, and the S&P 500 is poised to exceed the 7,000 milestone in the next few weeks,” said José Torres, senior economist at Interactive Brokers.

For investors, that would count as a very decent Christmas surprise.

— CNBC’s Jeff Cox contributed to this report.

What you need to know today

And finally…

U.S. President Donald Trump delivers remarks on the U.S. economy and affordability at the Mount Airy Casino Resort in Mount Pocono, Pennsylvania, U.S. Dec. 9, 2025.

Jonathan Ernst | Reuters

Trump slams European leaders as ‘weak’ — just as they’re trying to impress him

U.S. President Donald Trump has once again provoked outrage among his European allies, describing them as “weak” in an interview with Politico published Tuesday. Criticizing the region’s response to the war in Ukraine, Trump said: “I think they don’t know what to do.”

That comment will be jarring for Europe after its efforts to support Ukraine — efforts which Trump has frequently downplayed. Instead, Europe has had to watch on as U.S. officials have held talks with their Russian and Ukrainian counterparts on a draft peace plan for Ukraine, without a seat at the table. 

— Holly Ellyatt

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Night owl bitcoin traders: Soon there’ll be an ETF just for you

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Night owl bitcoin traders: Soon there'll be an ETF just for you

Cheng Xin | Getty Images

A newly proposed exchange-traded fund would offer exposure to bitcoin, much like other popular ETFs tracking the world’s oldest cryptocurrency. But, there’s a twist: The fund would trade bitcoin-linked assets while Wall Street sleeps. 

The Nicholas Bitcoin and Treasuries AfterDark ETF aims to purchase bitcoin-linked financial instruments after the U.S. financial markets close, and exit those positions shortly after the U.S. market re-opens each day, according to a December 9 filing to the Securities and Exchange Commission.

The fund would not hold bitcoin directly. Instead, the AfterDark ETF would use at least 80% of the value of its assets to trade bitcoin futures contracts, bitcoin exchange-traded products and ETFs, and options on those ETFs and ETPs. 

The offering would capitalize on bitcoin’s outsized gains in off-hours trading.

Hypothetically, an investor who had been buying shares of the iShares Bitcoin Trust ETF (IBIT) when U.S. markets formally close, and selling them at the next day’s open, would have scored a 222% gain since January 2024, data from wealth manager Bespoke Investment Group shows. But an investor that had bought IBIT shares at the open and sold them at the close would have lost 40.5% in the same time.

Bitcoin was last trading at $92,320, down nearly 1% on the day. The leading cryptocurrency is down about 12% over the past month and little changed since the beginning of the year. 

The proposed ETF underscores jockeying among sponsors to launch ETFs tracking all kinds of cryptocurrencies, from altcoins like Aptos and Sui to memecoins such as Bonk and Dogecoin. The contest has only accelerated under President Donald Trump, who has pushed the SEC and Commodity Futures Trading Commission to soften their stances on token issuers and digital asset exchanges. 

Since being approved under the prior administration in January 2024, more than 30 bitcoin ETFs have begun trading in the U.S., according to data from ETF.com.

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Cisco’s stock closes at record for first time since dot-com peak in 2000

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Cisco's stock closes at record for first time since dot-com peak in 2000

Chuck Robbins, chief executive officer of Cisco, participates in a Bloomberg interview at the World Economic Forum in Davos, Switzerland, on Jan. 17, 2024.

Stefan Wermuth | Bloomberg | Getty Images

Few companies were as hot in early 2000 as Cisco, whose networking equipment served as the backbone of the internet boom.

On Wednesday, Cisco’s stock surpassed its dot-com peak for the first time. The shares rose almost 1% to $80.25, topping their prior split-adjusted record or $80.06 reached on March 27, 2000. That’s the same day that Cisco passed Microsoft to become the most valuable publicly traded company in the world.

Back then, investors saw Cisco as a way to bet on the growth of the web, as companies that wanted to get online relied upon the hardware maker’s switches and routers. But following a half-decade boom, the dot-com bubble burst just after Cisco reached its zenith, a collapse that wiped out more than three-quarters of the Nasdaq’s value by October 2002.

While the market swoon eliminated scores of internet highflyers, Cisco survived the upheaval. Eventually it started to grow and expand, diversifying through a series of acquisitions like set-top box maker Scientific- Atlanta in 2006, followed by software companies including Webex, AppDynamics, Duo and Splunk.

With its gains on Wednesday, Cisco’s market cap sits at $317 billion, making it only the 13th most valuable U.S. tech company. In recent years, the stock has badly trailed tech’s megacaps, which have been at the center of the new boom surrounding artificial intelligence.

The AI market has reached a level of euphoria that many analysts have compared to the dot-com era. Instead of Cisco, the modern infrastructure winner is Nvidia, whose AI chips are at the heart of model development and are relied up by the other major tech companies that are all building out AI-focused data centers. Nvidia has a market cap of $4.5 trillion, roughly 14 times Cisco’s current value.

But Cisco is angling to benefit from the AI craze, with CEO Chuck Robbins in November touting $1.3 billion in quarterly AI infrastructure orders from large web companies. Total revenue approached $15 billion, which was up 7.5% year over year, compared with 66% growth in 2000.

Shares of Cisco are up about 36% so far in 2025, outperforming the Nasdaq, which has gained about 22% over the same period.

WATCH: Cisco CEO on latest quarter: AI demand from hyperscalers is accelerating

Cisco CEO on latest quarter: AI demand from hyperscalers is accelerating

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