Key Points
- Elon Musk is asking a U.S. court for up to $134 billion from OpenAI and Microsoft, claiming they received “wrongful gains” from his early seed support.
- Musk alleges OpenAI captured $65.5–$109.4 billion in value tied to his contributions, and Microsoft gained $13.3–$25.1 billion via its partnership.
- OpenAI calls the lawsuit “unserious” and part of a harassment campaign, while Microsoft says there’s no evidence it aided wrongdoing; both challenge the damages model.
Elon Musk has filed a high-stakes federal lawsuit seeking up to $134 billion in damages from OpenAI Inc. and Microsoft Corp., arguing they realised “wrongful gains” from his early involvement in the AI startup’s formation and success. Musk’s lawyers filed the complaint in Oakland, California, ahead of a jury trial expected to begin in April 2026, contending that his early contributions laid the foundation for OpenAI’s explosive growth and Microsoft’s strategic investment partnership. Musk’s filing asserts that OpenAI earned between $65.5 billion and $109.4 billion in gains traceable to his seed-stage support, while Microsoft’s share of alleged gains ranges from $13.3 billion to $25.1 billion.
He left OpenAI’s board in 2018 and now runs his own AI company, xAI, which operates a rival chatbot. Musk claims he put in about $38 million in early funding, helped recruit key staff and provided crucial credibility that enabled the outfit to attract top talent and partnerships. His legal team frames the claim as akin to a startup investor entitled to returns many times larger than the original investment, arguing that OpenAI’s restructuring to a for-profit model breached its original nonprofit mission and unfairly enriched its stakeholders.
OpenAI has dismissed Musk’s damages demand as “unserious” and part of a broader harassment campaign, with the company and Microsoft both challenging his expert’s calculations and arguing they are unreliable and unprecedented. They filed motions seeking to limit the scope of evidence Musk’s expert may present at trial, asserting that the damages model could mislead jurors and lacks a sound basis. Microsoft has declined to comment publicly on the damages figures.
Musk’s suit focuses on what his legal team calls “wrongful gains” from his foundational support rather than traditional claims over equity or ownership. The complaint highlights non-monetary contributions such as strategic advice and business introductions that he says were critical to OpenAI’s emergence as a global leader in generative AI. If successful, the claim could require disgorgement of a significant share of profits that accrued to both defendants from AI products, services and strategic investment returns.
The dispute stems from long-standing tensions over OpenAI’s transformation from a nonprofit mission to a for-profit enterprise and its deep commercial ties with Microsoft. Musk alleges that this shift diluted the original charitable intent of the organisation he helped found and transferred disproportionate value to Microsoft. A federal judge in California recently rejected a final bid by OpenAI and Microsoft to avoid a jury trial, clearing the way for proceedings to move forward.
Legal experts say the case could reshape how courts view contributions by early backers to high-growth AI firms, especially where governance changes and lucrative partnerships have taken place. Observers note the wide range of the damages figure — from roughly $79 billion to $134 billion — reflects the inherent uncertainty in valuing early-stage contributions to companies that have since ballooned to blockbuster valuations.
OpenAI’s current valuation stands at roughly $500 billion, and the collaboration with Microsoft, which holds a significant stake in the company, has been central to its commercial strategy. Musk’s suit also suggests he may seek punitive damages or injunctions if the jury finds liability, though specifics on those claims remain undefined in the filing. Both defendants have signalled they will contest the case vigorously, setting the stage for a high-profile legal battle in the AI sector.
