Elon Musk and Sam Altman are locked in a high-stakes trial that could reshape how the world thinks about artificial intelligence development and corporate accountability. The civil lawsuit centers on a fundamental betrayal: Musk claims he donated approximately $38 million to OpenAI between 2015 and 2017 believing he was funding a nonprofit dedicated to developing AI safely and altruistically, only to watch the company transform into a for-profit enterprise now valued at $852 billion.

The trial, which began with jury selection in late April 2026 in Oakland, California, represents far more than a billionaire's financial dispute. It exposes the early idealism of the AI race and how that vision fractured when profit became the priority. The case also carries enormous implications for how future AI companies are structured and governed, potentially influencing whether other organizations prioritize safety and public benefit over shareholder returns.

What Exactly Is Musk Accusing Altman Of?

Musk's lawsuit alleges that Sam Altman, OpenAI's CEO, and Greg Brockman, the company's president, deliberately deceived him about the company's direction. According to Musk's testimony during the trial, he believed OpenAI would remain a nonprofit organization with a for-profit subsidiary that would never "overtake" the charitable mission. Instead, Musk argues, the for-profit arm became the dominant entity, with Altman and Brockman unjustly enriching themselves in the process.

The lawsuit also names Microsoft as a co-defendant, accusing the tech giant of aiding and abetting OpenAI's alleged breach of charitable trust. Microsoft became OpenAI's largest investor after Musk stopped funding the company, pouring in $10 billion and helping drive the company's valuation to $20 billion and beyond.

Musk initially sought over $100 billion in damages, but pre-trial rulings significantly reduced his claims. He has since abandoned seeking personal damages and instead is pursuing an unspecified amount to fund OpenAI's charitable arm, with the money to come primarily from OpenAI's for-profit operations and Microsoft.

How Did Two AI Pioneers Become Bitter Rivals?

The relationship between Musk and Altman began with shared ideals. In 2015, they founded OpenAI as a nonprofit to create artificial intelligence in a more responsible and safer way than profit-driven competitors like Google's DeepMind. Musk was motivated partly by concerns that Google's approach to AI development wasn't safe enough and that there needed to be "some sort of counterpoint" to the search giant's closed-source, for-profit model.

But tensions emerged early. As far back as 2015, before OpenAI was even officially announced, Musk had proposed that the organization include a for-profit entity. By 2017, he directed his senior advisors to register a for-profit corporation under OpenAI's name. However, Musk testified that he expected the nonprofit to remain the dominant structure.

The breaking point came when Musk left OpenAI's board in February 2018. OpenAI's attorney, William Savitt, suggested during the trial that Musk quit because he was blocked from taking unilateral control of the company. Musk countered that he left to focus on his other ventures, including SpaceX and Tesla. What's clear is that after his departure, communication between Musk and Altman deteriorated.

A February 2023 email exchange captured the emotional toll of their falling out. Altman told Musk: "I am tremendously thankful for everything you've done to help. I don't think OpenAI would have happened without you, and it really hurts when you publicly attack OpenAI." Musk's response reflected his broader concerns: "I hear you and it is certainly not my intention to be hurtful, for which I apologize, but the fate of civilization is at stake".

Altman

What Are the Key Arguments Each Side Is Making?

Musk's legal team argues that OpenAI executives misled him about the company's trajectory. During his testimony, which spanned three days, Musk emphasized that he "gave them free funding to create a startup" because he believed he was donating to a nonprofit aimed at making AI "for the good of humanity." He acknowledged being fine with a for-profit subsidiary existing alongside the nonprofit, but only if the nonprofit remained the primary entity.

Musk

Musk also testified that his confidence in OpenAI's leadership began to erode around 2022. When he learned about Microsoft's $10 billion investment and OpenAI's resulting $20 billion valuation, Musk told Altman it felt like a "bait and switch." Altman's response, "I agree it feels bad," acknowledged Musk's concerns but noted that Musk had declined equity offers from the company.

OpenAI and Microsoft's defense takes a different approach. They argue that Musk was supportive of creating a for-profit structure and is now pursuing the lawsuit out of sour grapes because he couldn't take complete control of the company. They also suggest that Musk's real motivation is to undercut OpenAI's growth and bolster his own competing AI company, xAI, which he launched in 2023.

During cross-examination, Savitt pressed Musk on several points. He showed emails and documents from 2015 and 2017 in which Musk himself had proposed or directed the creation of for-profit structures. Savitt also questioned why Musk hasn't created a new AI nonprofit since leaving OpenAI's board, to which Musk responded: "Why would I start another nonprofit when I already started a nonprofit? That doesn't make any sense".

How to Understand the Trial's Broader Implications?

• Corporate Governance in AI: The trial raises fundamental questions about how AI companies should be structured and governed. If Musk prevails, it could establish legal precedent that for-profit subsidiaries of nonprofits must remain subordinate to their charitable missions, potentially influencing how future AI organizations are designed.
• Founder Accountability: The case examines whether founders and executives can be held legally responsible for shifting a company's mission without explicit consent from major stakeholders. This has implications beyond OpenAI, affecting how other tech companies manage governance and stakeholder expectations.
• AI Safety and Public Interest: At its core, the lawsuit reflects a tension between profit maximization and the public interest in safe AI development. The trial outcome could influence whether investors and boards prioritize safety considerations or growth metrics when making strategic decisions.
• Competitive Dynamics: The case exposes how the AI race has intensified competition among tech titans. Musk's xAI competes directly with OpenAI, raising questions about whether his lawsuit is partly motivated by competitive concerns rather than purely principled objections to OpenAI's structure.

What Happened During the Trial's First Week?

The trial's opening days revealed the personal and professional tensions underlying the lawsuit. Musk spent nearly three days on the stand, regularly clashing with OpenAI's attorney William Savitt. At one point, Musk accused Savitt of trying to "trick" him with questions he characterized as deliberately complex. The judge occasionally intervened, at one point telling Musk to actually answer the questions being asked rather than providing lengthy explanations.

The courtroom also became a venue for debating AI's existential risks. Before jury selection on Thursday, Musk's attorney Steven Molo stated that "we could all die" because of AI. However, Judge Yvonne Gonzalez Rogers shut down this line of argument, noting that such dire statements wouldn't be permitted in front of the jury, especially given that Musk had founded his own for-profit AI company. The judge remarked: "I suspect there are plenty of people who don't want to put the future of humanity in Mr. Musk's hands, but it doesn't matter, we aren't going to get into those issues".

Evidence presented during the trial included emails and documents from OpenAI's early years. Savitt showed Musk communications from 2018 in which Altman attempted to inform him about OpenAI's plans to secure additional funding from Microsoft. One email included a term sheet explicitly stating that OpenAI aimed to raise $10 billion in the future. Musk testified that he "did not read the fine print" of these documents.

Musk

"I was foolish enough to believe him," Musk testified regarding his trust in Altman's leadership.

Elon Musk, Tesla CEO and OpenAI Co-founder

What Are the Potential Outcomes and Their Consequences?

The trial's outcome remains uncertain, but the stakes are significant. Judge Gonzalez Rogers will make the final decision, with the jury serving in an advisory role. Any damages awarded are now likely to be much smaller than the $100 billion Musk originally sought, given pre-trial rulings that went against him.

If Musk prevails, he could secure funding for OpenAI's charitable arm, potentially reshaping how the company allocates resources between its for-profit and nonprofit operations. More broadly, a victory could establish legal precedent that constrains how other AI companies structure their governance and prioritize profit over public benefit.

If OpenAI and Microsoft prevail, it would signal that companies have significant latitude to shift their business models, even when founded with different missions. This could embolden other tech companies to prioritize growth and profitability over their original stated values.

The trial also carries personal risks for Musk. Last month, he was held liable by another jury for defrauding investors during his $44 billion takeover of Twitter in 2022. Any damaging details about Musk's business tactics could hurt his credibility, particularly as SpaceX plans to go public this summer in an initial public offering that could make him the world's first trillionaire.

Beyond the courtroom, the trial is expected to provide a window into the thinking that triggered the AI race and the unraveling of one of technology's most consequential friendships. The dueling testimonies of Altman and Musk will likely reveal how two visionaries with shared ideals about AI safety became bitter competitors in an industry that has transformed from a nonprofit mission into a multi-hundred-billion-dollar race for dominance.