Musk v. Altman live updates: Microsoft CEO to testify as week 3 of trial begins

Microsoft's CEO Satya Nadella is reportedly set to testify Monday in the landmark battle over artificial intelligence in Oakland.

Monday marks the start of week three of testimony.

OpenAI CEO Sam Altman is also expected to take the stand this week, as defense attorneys lay their case.

Elon Musk is suing OpenAI, accusing the company of abandoning a promise to remain a non-profit. The promise was allegedly tied to Musk's investment in the company.

Altman has accused Musk of trying to hobble the ChatGPT maker for the benefit of his own AI company.

At the heart of the trial pitting Elon Musk against OpenAI CEO Sam Altman is a moment when they found common cause on an ever more pressing question: how to protect humanity from the risks of artificial intelligence.

It turned sour, and the jury is charged with settling the ensuing legal dispute between the two Silicon Valley titans.

But the unresolved questions about the dangers of AI have been looming over the federal courthouse in Oakland, California, since the trial began last week. The technology itself is not on trial - the judge has warned lawyers not to get "sidetracked" by questions about its dangers - but witness testimony has touched on concerns around workforce disruptions and the prospect raised by Musk that superhuman AI might one day kill us all.

Musk, the world's richest person, filed the case accusing his fellow OpenAI co-founder of betraying promises to keep the company as a nonprofit. Altman, in turn, accuses Musk of trying to hobble the ChatGPT maker for the benefit of his own AI company.

One witness, AI pioneer Stuart Russell, said that the "winner take all" power struggle over AI's future is itself threatening humanity.

Musk's lawyers brought Russell to the stand as an expert witness, at the rate of $5,000 an hour. The University of California, Berkeley computer scientist listed a host of AI dangers, from racial and gender discrimination to jobs displacement, misinformation and emotional attachments that take some AI chatbot users down a spiral of psychosis.

"Whichever company develops AGI first would have a very big advantage" and an increasingly big lead over everyone else, Russell told the court, using the initials for artificial general intelligence, a term for advanced AI technology that surpasses humans at many tasks.

A judge's warning hasn't kept out talk of AI's dangers

The trial centers on the 2015 birth of OpenAI as a nonprofit startup primarily funded by Musk.

Both Musk and Altman, who has not yet testified in the trial, have said they wanted OpenAI to safely develop AGI for the benefit of humanity and not for any one person's gain or under any one person's control. And both camps allege it's the other guy who was trying to control it.

A jury of nine people selected from the San Francisco Bay Area will get to say which one of them is telling the truth.

Early on, Judge Yvonne Gonzalez Rogers warned lawyers, particularly Musk's, not to delve into broader AI concerns that go beyond Musk's claims that OpenAI violated its charitable mission.

"This is not a trial on the safety risks of artificial intelligence. This is not a trial on whether or not AI has damaged humanity," Gonzalez Rogers told lawyers before jurors arrived at the federal courthouse.

Still, Musk managed to skirt that guidance in his testimony last week. Asked to describe artificial general intelligence, Musk said it is when AI becomes "as smart as any human," and added that "we are getting close to that point," and AI will be smarter than any human as soon as next year.

Musk said he has "extreme concerns" about AI and has had them for a long time. Musk said he wanted a "counterpoint" to Google, which at the time had "all the money, all the computers and all the talent" for AI, with no counterbalance.

"I was concerned AI would be a double-edged sword," he said.

Musk and OpenAI each say they are working for humanity's benefit

During his testimony, Musk repeatedly said that he could have founded OpenAI as a for-profit company, just like the other companies he started or took over. "I deliberately chose this," he said, "for the public good."

The judge expressed some skepticism. In comments to lawyers last week before the jury came into the room, Gonzalez Rogers pointed out that Musk, "despite these risks, is creating a company that is in the exact same space," referring to the billionaire's xAI artificial intelligence company, which launched in 2023 and has since merged with Musk's rocket company SpaceX.

OpenAI's side also claims its goals are to benefit the public. OpenAI co-founder and president Greg Brockman, a defendant in Musk's lawsuit along with Altman and their company, said he thought the technology OpenAI was developing was "transformative" - bigger than corporations, corporate structures and bigger than any one individual. It was, he said, "about humanity as a whole."

Brockman testified this week that his No. 1 goal was always the "mission" of OpenAI and it was Musk who sought unilateral control over the company.

Brockman recalled a meeting where at first Musk seemed open to the idea of Altman being OpenAI's CEO. In the end, however, "he said people needed to know he was in charge."

In addition to damages, Musk is seeking Altman's ouster from OpenAI's board. If Musk wins, it could derail OpenAI's plans for an initial public offering of its shares.

At the federal courthouse in Oakland Wednesday -- the seventh day in the trial of Elon Musk's lawsuit against Sam Altman and OpenAI -- the jury heard the testimony of Shivon Zilis, a former OpenAI board member with a close and complicated relationship with Musk.

Zilis provided testimony about her service as a board member of OpenAI and her role during a critical six-week period when the founders who created OpenAI as a nonprofit corporation considered a variety of alternative structures to raise money.

Musk's suit contends that Altman and Brockman breached their fiduciary duties to devote the charitable assets of OpenAI, a nonprofit corporation, solely to the nonprofit's mission of developing artificial intelligence for the benefit of humanity.

Zilis is a key witness for both sides because she was involved at OpenAI in a number of different capacities and roles. She was a senior counselor for Musk and had a close personal relationship with him. The two share four children, the oldest two are twins born in 2021. She also served on the board of OpenAI from 2020 to 2023 and voted to approve a 2023 contract with Microsoft in which Microsoft invested $10 billion and also obtained greater rights to some of OpenAI's intellectual property. Musk contends that the contract was a key part of the defendant's breach of the charitable trust.

Shivon Zilis' direct testimony

Zilis walked firmly to the stand, dressed all in black. She spoke crisply and directly, answering questions without embellishment, occasionally saying "of course" rather than "yes."

She testified that after earning an undergraduate degree from Yale, she obtained a series of positions with organizations in the artificial intelligence universe, including an AI incubator and a venture capital firm focusing on the developing AI industry.

She explained her deep interest in artificial intelligence, recounting that at 13 years old she read a book called "The Age of Spiritual Machines" by Ray Kurzweil, the prominent futurist. The book discussed a world in which machines surpass human intelligence. She said that she read the book 10 to 15 times and it influenced what she wanted to do in life. For the last 15 years, she said AI has been at the center of her life.

In the early days of OpenAI's corporate existence, Greg Brockman offered her a job as chief operating officer for the fledgling organization. Brockman, along with Altman, Musk and Ilya Sutskever, was one of OpenAI's founders and he serves as its current president. At the time, they had not yet developed any applications or products, so she didn't think that it made sense to be a COO. However, she was interested in the mission and offered to work 10 hours a week for free as an advisor.

She met Musk at OpenAI and later went to work for him at three of his companies: SpaceX, Neuralink and Tesla. She said she worked 80 to 100 hours a week, trying to find and fix bottlenecks in the workflow.

"It was just bananas," she said.

Zilis was deeply involved during discussions among the OpenAI founders in August and September of 2017 about strategies for raising capital for the company's rapidly increasing needs for computing capacity. She said she often provided information to Musk and Sam Teller, another Musk employee, about conversations she had with some or all of the other OpenAI founders.

She testified that the discussions went on for weeks and considered many different strategies -- some crazy -- to raise the money that would likely be needed to develop artificial general intelligence, or AGI. She said the ideas were very wide-ranging and none of the concepts were ultimately agreed to by all the four founders.

She said that the discussions ended in 2018 in a "weird halfway breakup" between Musk and the other three founders. Altman, Brockman and Sutskever accepted the existing nonprofit structure of OpenAI but did not abandon interest in forming a for-profit company that would be able to attract investment capital.

Musk left OpenAI's board in February 2018, but Zilis remained involved with OpenAI, sometimes providing information to Musk and Teller about what was happening at the company. She sought advice from Musk about how to handle the "tricky" trust issues.

According to Zilis, she asked Musk, "Do you prefer I stay close and friendly to keep information flowing or begin to disassociate [from the OpenAI founders]?" - to which he said the former.

Zilis testified that thereafter, Altman invited her to serve on the OpenAI board. She said she accepted because not many people in the world were interested in pursuing AGI for the benefit of humanity. She wanted to be part of that mission. She joined the OpenAI board in 2020 and served until 2023.

Zilis's board service was complicated due to her relationship with Musk. She testified she had a romantic relationship with Musk years before, and later, after she had health issues, she accepted Musk's offer to provide a deposit for IVF fertilization. By that process, she has had four children with him, the most recent one in February 2025.

She said Musk works "maniac hours" and has a complicated life. They agreed to keep confidential that he was the father of her children, but in July of 2022 after a media outlet told her they were going to report on it, she disclosed it to Altman and Brockman. She said that the board considered whether she would stay a board member and decided that she could. Once she was on the board, Zilis said that she did not discuss her work at OpenAI with Musk.

Although she considered Altman a friend, Zilis said that when she was on the board, there were several incidents that made her concerned about Altman's candor.

One was a proposal that OpenAI enter a large energy supply agreement with Helion Energy -- a company working on producing nuclear energy by fusion -- but at that time it had not demonstrated that it could do so at scale. Altman and Brockman had a financial interest in the company. The interests were disclosed to the board, and they did not vote on approval, but Zilis thought the deal was an outlier compared to the other deals they had considered as a board. She said it was "super out of left field" and a "major bet on a speculative technology." It gave her a bad feeling in the pit of her stomach, she said.

Cross-examining Zilis

Sarah Eddy, one of OpenAI's lawyers, conducted a lengthy cross-examination of Zilis, repeatedly using excerpts from Zilis's deposition transcript to point out areas where she thought Zilis' answer to her question was different than what she had said at her deposition.

Eddy went after several main points.

Because Musk has argued that the other founders should have continued to operate OpenAI in the way it was originally structured, Eddy got Zilis to concede that she did not know of any promise to keep OpenAI as a nonprofit or not to establish a for-profit subsidiary.

To rebut Musk's contention that the other founders had fully committed to stay with OpenAI and keep it a nonprofit, Eddy walked Zilis through the evidence that Brockman and Sutskever never agreed to Musk's proposal that they remain for two years and not recruit employees after leaving.

A key component of Musk's claim is that in 2023, OpenAI entered a transaction with Microsoft that, in Musk's words, was when the other founders "stole the charity." Eddy brought out that Zilis, as a board member of OpenAI, voted to approve the Microsoft agreement.

To support the claim of the other founders that Musk was scheming to create an AGI lab at Tesla, Eddy used her cross examination to grill Zilis on email exchanges where Musk considered poaching several OpenAI employees for Tesla.

To rebut the idea that Musk was in the dark about the other founders' plan for changing the corporate structure after he left the OpenAI board, Eddy focused Zilis on documentation that showed that Musk knew of OpenAI's creation of a for-profit subsidiary and considered making an investment. Musk ultimately declined to invest but said that he was "supportive in spirit."

Zilis was composed throughout her cross-examination, generally accepting what the contemporaneous documents said but offering to "put them in context."

The trial will continue Thursday with live testimony of David Schizer, former dean of Columbia Law School with personal experience in running a humanitarian nonprofit.

Schizer was engaged by Musk's lawyers to give an expert opinion on whether OpenAI lived up to its duties as a nonprofit corporation.

OpenAI President Greg Brockman testified that Elon Musk "gave up" on the company now valued at more than $850 billion, describing a tense moment.

OpenAI President Greg Brockman testified Tuesday that Elon Musk "gave up" on the company now valued at more than $850 billion, describing a tense moment in which Musk reacted angrily after learning he would not have control.

Brockman, questioned by his own attorney, said Musk got up and stormed around a table during a meeting, adding that he thought Musk was going to hit him.

Testimony resumed with Brockman characterizing his past journal entries as deeply personal writings that were never meant to be public.

He said seeing them play out in this lawsuit has been 'very painful.'

"Greg Brockman has been waiting a long time to have the opportunity to tell a story," said William Savitt, an attorney for OpenAI.

"And he got the story out. The cross-examination was largely an exercise in a frustrated lawyer yelling at a witness who wasn't saying what he wanted him to."

Jurors were shown a glimpse into OpenAI's early days, including a photo of employees working out of Brockman's San Francisco apartment more than a decade ago.

Brockman maintained that the company's mission has always been his primary motivation, with financial compensation, his stake now estimated at nearly $30 billion, secondary.

Marc Toberoff, an attorney for Musk, challenged that characterization.

"Just imagine if the president of Saint Jude's Hospital for the children or for children did something like that. Mr. Brockman referred to, quote, the mission over 50 times in his testimony over two days. But the question now is, whose mission is it?" Toberoff said.

Brockman also testified about Musk offering free Tesla vehicles, which he believed was an attempt to influence him, though he accepted one.

In a text message presented in court, Brockman was asked whether the Tesla would make him "willing to accept massively unfavorable terms."

"The truth is this. It's a lesson here about how tough it can be when you actually meet your heroes," Savitt said, referring to the power struggle that played out between OpenAI's cofounders.

Brockman was further questioned about former OpenAI board member Shivon Zilis.

He said he first learned about her children with Musk through media reports, but trusted her to manage any potential conflict of interest.

"Mr. Musk left the OpenAI board of directors and has, a relationship with Mrs. Zilis that put her in the position to communicate information to him, which she did," Savitt said.

Zilis later stepped down after Musk launched the competing company xAI and is expected to be the next witness.

On Monday, Musk's attorney portrayed Brockman as someone who admired and depended on Musk's influence, referring to his journal entries as a diary.

On Tuesday, the tables turned as Brockman described Musk as someone who did not get artificial intelligence and told the court Musk belittled a researcher to the point the person nearly left the field. That researcher later became a key figure behind ChatGPT.