How Elon Musk left OpenAI, according to Greg Brockman

In late August 2017, key figures at OpenAI (then a small non-profit research lab) gathered to discuss how they would create a for-profit to commercialize its technology and raise the funds needed to realize AGI.

Elon Musk was demanding full control of the company and had just given each of his cofounders a Tesla Model 3. CTO Greg Brockman said he saw that as way of buttering them up at a time when Musk and Sam Altman were vying to win support for their respective visions of the company’s future. OpenAI’s head of research, Ilya Sutskever, had commissioned of a painting of a Tesla to give Musk during the meeting as a friendly gesture.

The conversation didn’t follow that mood: When Musk was told the others would not accede to his demand for control of the company, Brockman said he got angry and upset. He sat for several minutes thinking quietly.

Then, in Brockman’s telling, Musk said, “I decline.” The SpaceX and Tesla founder “stood up and stormed around the table…I thought he was going to hit me. He grabbed the painting and started to storm out of the room. And then he turned around and said, ‘When will you be departing OpenAI?’”

Brockman and Sutskever didn’t leave or commit to Musk’s vision. Musk stopped his regular donations to the company’s operating budget, and within six months, he would leave the board, though he paid for office space the company shared with Neuralink until 2020.

As today’s legal battle over the future of OpenAI proceeds, scrutiny has settled on a key period in 2017 when the the organization’s original cofounders disagreed about who would control its future, eventually bringing us Musk’s lawsuit against his cofounders.

We have yet to hear from Sam Altman, but OpenAI president Greg Brockman testified for two days, often referencing a personal journal that offers a rare insight into what’s like to be a 30 year-old tech executive in a pitched battle with Elon Musk.

“It’s very painful,” Brockman said of the publicity around the journal, which he called “deeply personal writings that there were never meant for the world to see. [But] there’s nothing in there I’m ashamed of.”

Cutthroat negotiations between startup founders are rarely shared so publicly, especially when a company becomes as world-changing as OpenAI.

We saw a recent taste this rancor when OpenAI’s lawyers shared a text message Musk sent to Brockman two days before the trial began: “By the end of this week, you and Sam will be the most hated men in America. If you insist, so it will be.”

The jury won’t see that note, but they Musk’s lawyers have done their best to realize its spirit. They are trying to show the court that Altman and Brockman “stole a charity,” while OpenAI’s legal team tries to show that Musk had the exact same plan in mind.

The inciting incident for all of this was when an OpenAI model defeated the top human player in the video game DOTA II. Brockman said that convinced everyone in the organization that compute was the key resource to create powerful AI tools, but that fundraising purely as a non-profit would be insufficient.

That led to talks about a for-profit subsidiary, of which Musk wanted “unequivocal” control, at least at the start. The other founders said proposed equal shares, and perhaps more more equity comensurate with a cash investment. Another idea on the table was somehow connecting OpenAI to Tesla’s AI work. Shivon Zillis, an OpenAI advisor who acted as a go-between for Musk and the team there, said there were more than 20 variations on the plan.

But when the other founders wouldn’t give Musk control, their partnership unravelled.

“It should not be the case that there exists one person with full and absolute control over OpenAI,” Brockman testified. Brockman and Sutskever discussed a plan to kick Elon out off OpenAI’s board in order to move forward, resulting in a November 2017 journal entries that Musk’s lawyers have focused on.

‘[C]an’t see us turning this into a for-profit without a very nasty fight,” Brockman wrote. “[I’m] just thinking about the office and we’re in the office. and his story will correctly be that we weren’t honest with him in the end about still wanting to do the for profit just without him….btw another realization from this is that it’d be wrong to steal the non-profit from him. to convert to a b-corp without him. that’d be pretty morally bankrupt. and he’s really not an idiot.”

That “steal the non-profit” line may seem damning, but the context, according to Brockman, was whether or not to try and toss Musk off the board. They ultimately did not do that. Musk left the board voluntarily in February 2018, concluding that “OpenAI is on a path of certain failure,” saying he planned to focus more on AI at Tesla.

Brockman described his reflections as an effort to determine whether he would be satisfied with his work life.

“This is the only chance we have to get out from Elon,” he wrote during the talks. “Is he the ‘glorious leader’ that I would pick? We truly have a chance to make this happen. Financially what will take me to $1B?”

That last reflection was also seized on by Musk’s lawyers as a sign that Brockman was thinking more about his personal wealth than the non-profit’s mission. Brockman said his current stake in the company is worth almost $30 billion, which became an opportunity for Steve Molo, the main trial attorney for Musk, to berate him.

“Why you didn’t take the $29 billion more than the billion you said you would be good with, and donate that to the charity?” Molo demanded.

“Look at what we accomplished,” Brockman replied. “The OpenAI non-profit has over $150 billion of OpenAI equity value. That is something we have built through hard work, blood, sweat and tears, all this time since Elon has left.”

Molo also dwelt on emails from where Brockman said he will donate $100,000 to OpenAI, something he never did. Ironically, Brockman might be best known to the public for making the largest donation of the 2025 political cycle, $25 million given to MAGA Inc., a SuperPAC supporting President Donald Trump, but that didn’t come up in the trial.

Molo did mock Brockman’s description of the charged meeting around his control of the company as Musk being “mean” to Brockman, and suggested that Brockman didn’t understand the governance issues the way Musk, a serial founder, did.

Brockman, though, said Musk didn’t understand AI. “He did not and does not know AI,” he testified, describing Musk dismissing an early demonstration of the software that would become ChatGPT. “We did not think he was going to spend the time required to actually get good at it.”

“The fact that Elon saw this very early version of the research, that really set all these things in motion, [and] didn’t recognize that spark—that was exactly the kind of thing that was critical to avoid happening in this environment,” Brockman said.

In 2019, OpenAI would create a for-profit and use it to raise $1 billion from Microsoft. The company would raise a further $13 billion from the software giant over the next four years, fueling its rise as the leading AI frontier lab. It also fueled the net worth of the company’s executives and employees, as well as the assets held by OpenAI the non-profit.

And ultimately, those deals fueled Musk’s suspicions that Altman and Brockman got one over on him, leading him to file his suit in 2024. The trial is expected to continue through next week.