OpenAI President Greg Brockman testified in a California court on Tuesday, alleging that Elon Musk physically threatened him during a 2017 dispute.
Brockman claimed the billionaire became aggressive and stormed out after his demand for total control of the AI firm was rejected.
This testimony is part of an ongoing legal battle where Musk accuses OpenAI and CEO Sam Altman of abandoning the company’s original nonprofit goals in favour of a massive commercial valuation.
During the trial, Musk’s legal team presented Brockman’s private diary entries to suggest he was a “calculating opportunist.”
Brockman defended his writings, stating they were personal reflections he was not ashamed of, despite being used to claim he morally questioned the shift away from a non-profit structure.

He also alleged that upon leaving in 2018, Musk told staff he would develop AI at Tesla without prioritising safety, comparing those concerned with safety to “sheep.”
OpenAI’s defence argues that Musk’s lawsuit is a meritless move by a direct competitor who was fully aware of the company’s transition to a for-profit model.
Brockman highlighted the immense costs of modern AI, noting that the company’s annual computing expenses have skyrocketed from $30 million in 2017 to $50 billion today.
While Brockman’s own stake in the company is now valued at $30 billion, OpenAI maintains that the scale of current technology made the original charity-based model impossible to sustain.
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