Ilya Sutskever Stands by His Role in Sam Altman’s OpenAI Ouster: ‘I Didn’t Want It to Be Destroyed’

Elon Musk’s trial against OpenAI and Microsoft entered its final stretch on Monday, with testimony from Microsoft CEO Satya Nadella, former OpenAI chief scientist Ilya Sutskever, and current OpenAI chairman Bret Taylor.

Sutskever drew the spotlight, revealing an ownership stake in OpenAI’s $850-billion for-profit arm that is currently worth about $7 billion. That makes him one of the largest known individual shareholders of OpenAI. Earlier in the trial, OpenAI president Greg Brockman acknowledged for the first time that he has around $30 billion worth of OpenAI shares.

Brockman was one of the research lab’s original cofounders, and Sutskever joined shortly afterward, turning down a $6 million annual compensation offer from Google. Brockman said he and Sutskever were “joined at the hip,” until Sutskever helped lead Sam Altman’s brief removal as OpenAI CEO in 2023. Sutskever had helped collect evidence to show Altman’s alleged history of deception, and even assisted in drafting a memo to the board. Though they tried to repair the relationship, Sutskever has been estranged from Brockman and Altman ever since, a lawyer for OpenAI said on Monday.

Sutskever, who arrived in the courtroom wearing a dress shirt and slacks, the first male witness to testify without a suit jacket, appeared to be dejected about no longer being involved with OpenAI. (He left and formed a competing AI lab in 2024.) “I felt a great deal of ownership of OpenAI,” he said at one point Monday. “I felt like I put my life into it, and I simply cared for it, and I didn’t want it to be destroyed.”

Sutskever’s testimony bolstered Musk’s contention that Altman is not the right person to lead an AI lab that could create artificial general intelligence. In addition, Sutskever mentioned how the superalignment team he helped lead, which focused on the safety of future models, was doing the most important work at OpenAI “for the long term.” The team was disbanded in May 2024, shortly after Sutskever left the company.

But Sutskever also added to OpenAI’s defense that Musk never negotiated any special promises when funding the OpenAI nonprofit. Musk’s allegation that such commitments existed and that Altman and Brockman violated them by pursuing a lucrative for-profit arm are the core of his claims in the lawsuit. Sutskever said OpenAI needed “a lot of dollars” to build a computer as big as the human brain, and while seeking donations had some “reasonable success,” becoming a for-profit was the consensus way forward.

“I would describe it as the difference between an ant and a cat,” Sutskever said in response to a question from US district judge Yvonne Gonzalez Rogers about how more computing helped OpenAI level up. “If there’s no funding, there is no big computer.”

Much of Monday’s testimony centered around the well-covered events of Altman’s ouster and reinstatement as CEO in November 2023. Nadella described Sutskever and other board members firing Altman as “amateur city” and reiterated that he “never got clarity” about the lack of candor that led to their decision.

In his lawsuit, Musk accused Microsoft of helping to transform OpenAI into a moneymaking machine beyond what Musk intended. Nadella testified that Microsoft had first supported OpenAI with discounted cloud computing but it could no longer afford to do so “once the bill started going up.”

As of March 2025, Microsoft had generated $9.5 billion in sales from OpenAI, including through an agreement where the research lab shares 20 percent of its revenue with the tech giant. OpenAI chairman Bret Taylor ended Monday by giving Altman a glowing review, noting he has been forthright and grown the company beyond expectations. Altman is scheduled to tell his side of the story to jurors on Tuesday.