OpenAI CEO Sam Altman sat in the witness chair for the first time in the federal trial that could determine his future at the company he helped build, facing pointed cross-examination from Elon Musk's legal team about whether he can be trusted to lead one of the most powerful artificial intelligence ventures on the planet.
The testimony, delivered in a packed federal courtroom, marked the highest-stakes moment yet in a civil lawsuit that has turned into a bare-knuckle fight over who betrayed OpenAI's founding promise. Musk wants Altman removed. Altman says Musk wanted too much control. And the jury now has to decide which version of events holds up.
Musk's attorney Steven Molo wasted no time. As the New York Post reported, Molo asked Altman directly on cross-examination:
"Are you completely trustworthy?"
The question landed against a backdrop of days of testimony from former OpenAI insiders who painted a very different picture of the CEO than the one Altman presented. Musk's legal team had already built its case on sworn statements from people who once worked alongside Altman, including former board members and a co-founder, each describing concerns about his honesty.
Altman pushed back. He told the court he believes in his own integrity.
"I believe I am an honest and trustworthy businessperson."
That declaration set up the central collision of the trial: Altman's self-assessment versus a string of testimony from people who say they watched him operate behind closed doors.
Before Altman ever took the stand, Musk's team had already introduced testimony from several former OpenAI figures. The names carry weight. Helen Toner, a former board member, described what she called a pattern of behavior that led to her concerns about Altman's leadership. As Newsmax reported, Toner testified:
"A phrase we used was 'a pattern of behavior,' so no one single cause. The pattern of behavior related to his honesty and candor, his resistance of board oversight."
That testimony echoed what OpenAI co-founder Ilya Sutskever had described in a 2023 memo to the board, in which he accused Altman of exhibiting a "consistent pattern of lying."
Musk's lawyers also highlighted taped testimony from former OpenAI executive Mira Murati, who described her own reservations about Altman's consistency. Murati said in her recorded statement:
"My concern was about Sam saying one thing to one person and completely the opposite to another person."
Tasha McCauley, another former board member, was also cited by Musk's legal team as part of the broader pattern of insider concern. Taken together, the testimony paints a picture of a CEO whose internal reputation among the people closest to OpenAI's governance was far less polished than his public image.
The lawsuit is not simply about hurt feelings or broken promises. Musk's civil complaint asks the court to remove Altman from OpenAI's leadership and to restore the organization's original nonprofit structure. The core allegation: Musk was induced to help fund OpenAI based on its stated mission as a nonprofit dedicated to developing artificial general intelligence safely and for the benefit of humanity, and Altman and co-founder Greg Brockman later abandoned that mission to chase profits.
Musk testified earlier in the trial about what he described as a bait-and-switch. His legal team has framed the case as a story of mission drift, arguing that OpenAI's current for-profit structure concentrates exactly the kind of power the nonprofit was designed to prevent.
The procedural posture matters here. This is a civil case, not a criminal one. No one faces prison. But the remedy Musk seeks is extraordinary: the ouster of a sitting CEO and the unwinding of a corporate restructuring at one of the most valuable private companies in the technology sector.
Altman did not simply absorb the attacks. He offered his own version of events, one that reframes Musk as the real threat to OpenAI's independence. As AP News reported, Altman testified that one of the founding reasons for OpenAI was to ensure that artificial general intelligence would never fall under the control of a single individual.
"Part of the reason we started OpenAI is we didn't think AGI could be under the control of any one person, no matter how good their intents are."
Altman went further. He told the court that Musk had pushed for greater control over OpenAI and had even proposed that Tesla absorb the organization. If true, that proposal would cut directly against Musk's public argument that he wanted OpenAI to remain independent and mission-driven.
The defense strategy is clear: flip the narrative. Altman wants the jury to see Musk not as a wronged benefactor but as someone who walked away when he could not get the control he wanted and then sued to get it back.
Both sides now face the same problem from opposite directions. Musk's team has produced multiple witnesses who question Altman's honesty. Altman's team is asking the jury to believe that Musk's motives are self-serving. Neither side has a clean narrative.
The trial has also surfaced questions about board dynamics and internal governance at OpenAI that go well beyond the two principals. Testimony from other witnesses has raised issues about board loyalty, personal relationships, and whether OpenAI's oversight structure was ever strong enough to hold its leadership accountable.
Investigators and the court will need to weigh these competing accounts carefully. The jury has heard from insiders on both sides. What they have not heard, at least not yet in any publicly confirmed form, is definitive documentary evidence that resolves the core dispute: Did Altman mislead Musk about OpenAI's trajectory, or did Musk simply lose a strategic battle and decide to litigate?
The case arrives at a moment when courts across the country are grappling with how to hold technology giants accountable for governance failures and public commitments. The question of whether a nonprofit can quietly convert itself into a profit engine without answering to its original backers has implications far beyond Silicon Valley.
Musk himself has faced his own courtroom battles over credibility and public statements. A California jury previously found that some of his tweets were misleading in a separate case involving his acquisition of Twitter, though that jury rejected the broader fraud claim.
He also recently settled a disclosure lawsuit with the SEC for $1.5 million without admitting wrongdoing. Those cases do not determine the outcome here, but they form part of the backdrop against which both men's credibility will be measured.
Altman's testimony is not finished. The cross-examination from Musk's lawyers is expected to continue, and the defense will have its own opportunity to present Altman's version of events in fuller detail. The court has not publicly confirmed a timeline for closing arguments or a verdict.
Breitbart reported that Altman took the stand to defend his business record as Musk seeks his ouster, framing the testimony as the defining moment of a trial that could reshape one of the most influential AI companies in the world.
The stakes are not abstract. OpenAI sits at the center of a technology race that touches national security, economic competitiveness, and the future of how artificial intelligence is governed. Whether the company's leadership structure survives this trial will send a signal about whether nonprofit commitments in the tech sector mean anything at all, or whether they are just marketing copy that dissolves the moment real money shows up.
When the people who helped build an organization line up in court to say its CEO has a pattern of dishonesty, that is not a PR problem. That is a governance crisis. And no amount of polished testimony can make that go away on its own.
