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Musk Loses OpenAI Lawsuit on a Technicality, Promises Appeal

19 May 2026

A jury unanimously ruled against Elon Musk in his lawsuit against OpenAI, finding that his claims were filed too late and are barred by the applicable statutes of limitations. Musk had argued that OpenAI's founders breached a charitable trust and unjustly enriched themselves by abandoning the company's nonprofit mission, but the jury determined he had reason to suspect this before the legal deadlines had passed. Musk has announced he will appeal the decision, dismissing the outcome as a "calendar technicality" rather than a ruling on the merits of his case.

Elon Musk's legal campaign against OpenAI has hit a wall. A jury returned a unanimous advisory verdict on Monday concluding that Musk waited too long to file his claims, putting them outside the applicable statutes of limitations. US District Judge Yvonne Gonzalez Rogers accepted the verdict immediately.

Musk, predictably, took to X to announce an appeal. "The judge & jury never actually ruled on the merits of the case, just on a calendar technicality," he wrote. Which is technically true, though 'calendar technicality' is doing a lot of heavy lifting for what is a fundamental rule of civil litigation.

The background is well-trodden territory by now. Musk co-founded OpenAI in 2015 alongside Sam Altman, Greg Brockman, and others. The organisation was set up as a nonprofit, explicitly aimed at developing AI for humanity's benefit rather than shareholder returns. Musk contributed $38 million in early funding and claimed he did so on the understanding that Altman and Brockman had promised to keep it that way.

His lawsuit brought two complaints. First, that Altman and Brockman breached the charitable trust underpinning his donations by allowing OpenAI to mutate into something profit-driven. Second, that they unjustly enriched themselves at his expense in the process. He filed the suit in 2024 and asked the court to reverse OpenAI's 2025 restructuring into a public benefit corporation and remove Altman and Brockman from their positions.

OpenAI's defence was blunt: the clock ran out years ago. The breach of charitable trust claim carries a three-year limitation window; unjust enrichment, two years. For Musk's 2024 filing to hold up, he would need to have first had reason to suspect wrongdoing no earlier than 2021 and 2022 respectively. OpenAI argued he had plenty of grounds for suspicion well before either of those dates.

The case turned on a timeline that Musk described in terms of three phases. Phase one: enthusiastic supporter. Phase two: growing suspicion that he was being misled. Phase three: certainty that the nonprofit was being looted. The question for the jury was when, exactly, phase two began.

In 2017, while OpenAI was still finding its feet, Musk and the other co-founders were already discussing a for-profit structure to raise the capital needed to chase artificial general intelligence. Musk even floated merging OpenAI with Tesla. OpenAI's lawyers used this against him, suggesting he was aware of the commercial direction from early on. Musk pushed back, saying he had no objection to a small for-profit arm funding the nonprofit, provided the nonprofit remained in charge.

In 2019, OpenAI launched its capped-profit subsidiary and secured a billion dollars from Microsoft. Musk testified this didn't bother him much. A capped return, he argued, was consistent with the nonprofit mission. No lawsuit warranted.

Then in 2020, Microsoft locked down an exclusive licence to GPT-3, and Musk posted publicly that OpenAI had become 'captured by Microsoft.' OpenAI flagged this as another moment he had reason to act. Musk countered that Altman personally reassured him the nonprofit mission was intact, and that despite some scepticism he still lacked sufficient grounds to sue.

It was the 2022 reports of a looming $10 billion Microsoft investment, Musk testified, that finally convinced him something had gone badly wrong. 'This is a bait and switch,' he texted Altman at the time. He told the jury that a $10 billion injection only made sense if Microsoft expected serious financial returns, which meant the nonprofit framing had become fiction.

The jury wasn't buying the 2022 discovery date. They found Musk had reason to suspect he was being misled before 2021, which renders both claims time-barred. They did not assess whether he was actually misled, since they didn't need to.

Courts tend to reach for procedural exits like this when they're available. Resolving a dispute on limitations grounds is cleaner than adjudicating years of contested intentions and disputed promises.

Musk will now take his case to the Ninth Circuit Court of Appeals. Whether an appellate court will see things differently is another matter, but it keeps the saga going, which may itself be part of the strategy.