OpenAI Accuses Musk of Legal Ambush Ahead of $100B Trial

OpenAI filed a late-Friday court document accusing Elon Musk of a "legal ambush," claiming he shifted the core objectives of his lawsuit just weeks before a trial with more than $100 billion in valuation on the line.

According to the filing, reported by Bloomberg, the revised remedies Musk proposed earlier in the week amount to "sandbagging the defendants and injecting chaos into the proceedings, while trying to recast his public narrative about his lawsuit." With trial weeks away, discovery is closed and both sides have locked in their arguments. A late shift in the specific relief being sought is not routine legal procedure.

Background

Musk co-founded OpenAI in 2015 alongside Sam Altman, contributing tens of millions of dollars to what was framed as a nonprofit AI safety lab. He left the board in 2018, citing conflicts of interest with Tesla. As OpenAI moved toward a for-profit restructuring and its valuation surpassed $100 billion, Musk sued, arguing the company had abandoned its founding charitable mission.

OpenAI has maintained throughout that the suit is driven by competitive interest, not principle. Musk launched his own AI company, xAI, in 2023. His legal team's apparent pivot on remedies weeks before trial fits OpenAI's characterization of litigation aimed more at disruption than resolution.

What is at stake

The case carries implications beyond the two parties. A ruling in Musk's favor could constrain how nonprofit AI organizations structure commercial vehicles, a model used across the sector. Whether courts will enforce founding-era charitable obligations on organizations that have since scaled to trillion-dollar adjacency is a question with no clean precedent.

The same week brought data points that show how drastically the commercial landscape has shifted since Musk first filed. Yahoo Finance reported that CoreWeave signed a multi-year compute deal with Anthropic, pushing CoreWeave stock up more than 12% on Friday. Anthropic separately disclosed annualized revenue surpassing $30 billion, up from roughly $9 billion at the end of 2025. An OpenAI memo to investors this week characterized Anthropic as compute-constrained, citing 1.4 gigawatts of capacity versus OpenAI's own 1.9 gigawatts. Anthropic disputed that figure, pointing to its Google and Broadcom deal.

Training data is also solidifying as a distinct commercial layer. SiliconAngle reported that AfterQuery, a 14-month-old startup selling curated datasets to AI labs, raised $30 million at a $300 million valuation after crossing $100 million in annualized revenue. On a separate operational matter, OpenAI asked Mac users to update its apps, including ChatGPT and Codex, after a security issue tied to a third-party tool called Axios, as reported by 9to5Mac. The company said it found no evidence of data being compromised, but warned older app versions may stop working after May 8.

That commercial frenzy underscores how far OpenAI has traveled from the nonprofit lab Musk helped seed. The organization he is trying to constrain through litigation is now among the most valuable private companies in the world, and its closest rival is one he controls.

The question the trial will ultimately force is whether a co-founder's early intentions create durable legal obligations on a company that has since scaled beyond recognition. Whether the judge allows Musk's late pivot on remedies will signal just how much courts are willing to police litigation tactics in high-stakes tech disputes, and whether that threshold has any teeth.

FAQ

What is the OpenAI versus Elon Musk lawsuit about? Musk sued OpenAI alleging the company abandoned its nonprofit origins by pursuing a for-profit restructuring. He was a founding donor and early board member. OpenAI argues the suit is driven by the fact that Musk now runs xAI, a direct AI competitor.

What does "legal ambush" mean in this context? OpenAI used the phrase in a court filing to describe Musk changing the specific remedies he is seeking weeks before trial, after discovery has closed. OpenAI argues the move is designed to disrupt proceedings rather than clarify a legal position.

When is the trial scheduled? The trial is weeks away as of April 2026. An exact date has not been confirmed in available reporting.

Could the outcome affect other AI companies? Potentially. A ruling for Musk could constrain how nonprofit AI organizations structure for-profit commercial vehicles, a model used by more than just OpenAI.