Elon Musk confirms xAI used OpenAI’s models to train Grok

```json { "title": "Musk Confirms xAI Used OpenAI Models to Train Grok", "metaDescription": "Elon Musk testified in federal court that xAI used OpenAI's models to train Grok via model distillation — while simultaneously suing OpenAI for misconduct.", "content": "<h2>Musk Admits xAI Trained Grok on OpenAI Models During Federal Trial</h2><p>In a striking moment of courtroom irony, Elon Musk confirmed under oath on April 30, 2026, that his AI startup xAI used OpenAI's models to help develop Grok — the very company he is currently suing for alleged ethical and governance violations. Testifying before Judge Yvonne Gonzalez Rogers in federal court in Oakland, California, Musk acknowledged that xAI employed model distillation techniques using OpenAI's models, characterizing the practice as standard across the AI industry. The admission came during cross-examination by OpenAI's lead attorney William Savitt and quickly became one of the most consequential moments of the trial so far.</p><h2>What Is Model Distillation — and Why Does It Matter?</h2><p>Model distillation, also known as knowledge distillation, is a widely used machine learning technique in which a larger, more capable model acts as a "teacher," and its outputs are used to fine-tune a smaller, more cost-efficient "student" model. According to OpenAI's own documentation, this process allows smaller models to match the performance of advanced models on specific tasks at a significantly lower computational cost.</p><p>When Savitt asked Musk directly whether xAI had used OpenAI's models to help develop or test its own models, Musk confirmed it was true and asserted it was a general practice among AI companies. The legality of the technique remains in a gray zone: it is not explicitly illegal, but it may violate the terms of service that AI companies set for the use of their products, according to reporting by TechCrunch. The broader industry has taken note of distillation as a competitive and security concern — OpenAI, Anthropic, and Google have reportedly launched an initiative through the Frontier Model Forum to share information about how to combat distillation attempts from China.</p><p>The admission places Musk in an awkward position. He is suing OpenAI for alleged ethical violations and the misuse of a charitable mission, while simultaneously his own company appears to have used OpenAI's proprietary models to advance a direct commercial competitor in Grok.</p><h2>The Trial: Musk v. OpenAI, Day by Day</h2><p>The trial between Musk and OpenAI opened on April 27, 2026, and is being heard before Judge Gonzalez Rogers — the same judge who presided over the landmark Epic Games v. Apple case. A jury is serving in an advisory role. Musk filed suit in 2024, naming OpenAI, Sam Altman, Greg Brockman, and Microsoft as defendants. At the heart of the case are two legal claims: breach of charitable trust and unjust enrichment.</p><p>Musk's legal team argues that the roughly $38 million he contributed to OpenAI was used for unauthorized commercial purposes that did not advance its charitable mission. According to legal filings cited in the case, Musk's total financial contributions to OpenAI amounted to $44 million. He is seeking $150 billion in damages from OpenAI and Microsoft, with any award directed to OpenAI's charitable arm. Microsoft is named as a co-defendant, with Musk accusing the company of aiding and abetting OpenAI's alleged misconduct.</p><p>Musk stepped down as co-chair of OpenAI in 2018 and continued donating to the organization until 2020. He co-founded xAI in March 2023 — initially structured as a Nevada benefit corporation, a status it dropped in 2024 — and launched Grok later that year as a direct competitor to OpenAI's ChatGPT.</p><h2>OpenAI's Restructuring and the Stakes Involved</h2><p>A key backdrop to the trial is OpenAI's significant corporate transformation. In October 2025, OpenAI restructured into a nonprofit called the OpenAI Foundation, which holds approximately a 26% stake in the for-profit entity OpenAI Group PBC. Microsoft holds a roughly 27% stake in that for-profit arm. OpenAI is currently valued at $852 billion, according to the Associated Press. Its flagship product, ChatGPT, has more than 700 million weekly users, according to the company.</p><p>Musk's own corporate structure has also evolved considerably. He merged xAI with his social network X in 2025 and subsequently folded the combined entity into SpaceX in 2026. Tesla has invested $2 billion into xAI and has integrated a version of the Grok chatbot into Tesla vehicles' media and navigation systems. SpaceX, which now encompasses xAI, is valued at $1.25 trillion, with an IPO expected in June 2026.</p><p>Following Musk's testimony, Jared Birchall — who manages Musk's family office Excession LLC and serves as an executive at both xAI and Neuralink — was called as the next witness.</p><h2>What Witnesses Are Expected</h2><p>The trial is expected to continue for several weeks. Expected witnesses include OpenAI CEO Sam Altman, co-founder Greg Brockman, and Microsoft CEO Satya Nadella, along with several key researchers and engineers involved in OpenAI's founding. Each of these testimonies is likely to shed further light on the internal decision-making that led to OpenAI's shift toward a for-profit structure — the central grievance driving Musk's lawsuit.</p><h2>Expert Reactions and Courtroom Statements</h2><p>The opening statements set a combative tone from both sides. OpenAI's lead counsel framed the lawsuit as a grievance born of competitive frustration: <strong>"We're here because Mr. Musk didn't get his way at OpenAI,"</strong> said William Savitt. Musk's attorney struck back with equal force: <strong>"Ladies and gentlemen, we are here today because the defendants in this case stole a charity,"</strong> said Steve Molo.</p><p>Microsoft's lawyer, Russell Cohen, zeroed in on the timeline of Musk's complaints during his opening statement: <strong>"It was only after ChatGPT was so successful that he launched his own for-profit AI company, xAI, that he suddenly made his claims against Microsoft."</strong></p><p>Musk himself offered a pointed view on the broader stakes of AI commercialization while on the stand. When asked whether a for-profit AI company creates a safety risk, he testified: <strong>"Yes, I think it creates a safety risk."</strong> He also addressed Microsoft's $10 billion investment in OpenAI directly: <strong>"I reacted quite negatively because at a $10 billion scale, there's no way Microsoft is just giving that as a donation or any kind of charitable way."</strong></p><p>OpenAI, for its part, issued a public statement that captured the complexity of the relationship: <strong>"We're sad that it's come to this with someone whom we've deeply admired — someone who inspired us to aim higher, then told us we would fail, started a competitor, and then sued us."</strong></p><p>Dan Ives, analyst at Wedbush Securities, offered a measured read on the likely outcome: <strong>"We believe any major damage to OpenAI and Altman will be more scrapes and bruises than real consequences to the company and his role as CEO."</strong></p><h2>Why This Trial Has Industry-Wide Implications</h2><p>Beyond the personal conflict between Musk and Altman, the trial raises foundational questions about how AI companies are governed, how charitable missions translate into corporate structure, and where the line falls between competitive intelligence and terms-of-service violations. The model distillation admission alone opens a window into an industry-wide practice that has largely operated without legal scrutiny — until now.</p><p>The Frontier Model Forum's reported initiative to address distillation attempts signals that major AI labs view the technique as a serious enough concern to coordinate a collective response, at least in the context of foreign competition. What that means for domestic practices — including xAI's use of OpenAI's models — remains an open legal and ethical question that this trial may help clarify.</p><p>For everyday users and businesses that depend on AI tools for productivity, the outcome of this case could influence how AI products are built, licensed, and governed for years to come. If courts determine that model distillation violates enforceable terms of service, it could reshape how AI companies protect their proprietary systems and how competitors are permitted to build on top of them.</p><p>For more tech news, visit our <a href=\"/news\">news section</a>.</p><h2>What to Watch Next</h2><p>The trial continues in Oakland before Judge Gonzalez Rogers. Testimony from Sam Altman, Greg Brockman, and Satya Nadella will be closely watched for any new disclosures about OpenAI's internal deliberations around its nonprofit-to-profit transition. Musk's admission regarding model distillation has already shifted some of the narrative momentum in the courtroom and may factor into how OpenAI frames its counterarguments in the weeks ahead. Whether the distillation revelation has any bearing on the core legal claims — breach of charitable trust and unjust enrichment — remains to be seen, but it has undeniably complicated Musk's positioning as a principled challenger to AI commercialization.</p><p>The AI industry, regulators, and legal observers will be watching closely as this case moves forward. It is shaping up to be one of the most consequential tech trials of the decade.</p><hr/><p><em>The way AI is built, governed, and monetized has direct consequences for the tools billions of people rely on daily — from productivity apps to health platforms. At Moccet, we track the technologies and decisions shaping how you work, focus, and perform. <a href=\"/#waitlist\">Join the Moccet waitlist</a> to stay ahead of the curve.</em></p>", "excerpt": "Elon Musk confirmed under oath on April 30, 2026, that his AI startup xAI used OpenAI's models to train Grok through a technique called model distillation — even as he sues OpenAI for $150 billion over alleged ethical violations. The admission, made during cross-examination in a federal courtroom in Oakland, California, has become one of the most striking moments of a trial that is set to continue for weeks.", "keywords": ["Elon Musk xAI OpenAI trial", "model distillation Grok", "Musk v OpenAI lawsuit", "xAI trained on OpenAI models", "OpenAI model distillation"], "slug": "musk-confirms-xai-used-openai-models-to-train-grok" } ```