Brockman’s diary called it a lie. Now a jury will hear it.

Jury selection begins Monday in Musk v. Altman, the federal trial over whether OpenAI’s nonprofit-to-profit conversion constitutes unjust enrichment and breach of charitable trust. Musk dropped fraud claims Friday to sharpen focus on the two remaining counts. The most damaging evidence is Greg Brockman’s 2017 diary entry calling the nonprofit commitment “a lie.” Judge Gonzalez Rogers found “ample evidence” and rejected nearly every dismissal attempt. The advisory jury will hear testimony from Musk, Altman, Nadella, Murati, and Sutskever, but the judge alone decides remedies, which could include $150 billion in damages and the unwinding of the conversion.

Jury selection begins Monday in Oakland federal court for the trial that will determine whether OpenAI’s conversion from a nonprofit to one of the most valuable companies in the world was a breach of charitable trust. Elon Musk, who co-founded OpenAI in 2015 and donated at least $38 million to ...