Her job under Musk was “to go find bottlenecks and solve them,” and she claims to have worked 80 to 100 hours a week doing that. “It was just bananas,” she said. Her first two children by Musk — twins — were born in 2021, while Zilis was serving on OpenAI’s board. She kept this a secret. She did not tell the board who the father was until Business Insider reported on court documents that listed Musk as the father.

“My first call was to my dad,” said Zilis, who testified that even her own family didn’t know the children’s paternity. “The call right after that was to Sam Altman.” Greg Brockman, OpenAI’s president, had testified he found out about Zilis’ children from news reports. When he talked to her about it, she claimed her relationship with Musk was “platonic” and that she’d had kids via IVF. This was reassurance enough for Brockman, who’d been friends with her since 2013. She remained on the board.

On the stand, Zilis spoke softly and quickly. She seemed mousy. A significant part of what made her testimony so bad for Musk was that she appeared to be the only person taking notes on what Brockman, Altman, Ilya Sutskever, and Musk were discussing when the cofounders considered their options for creating a for-profit arm of OpenAI. She also was “aiding and facilitating communication between the principal parties.” Those notes are the trial’s most important evidence — more important, even, than Brockman’s diary.

The goal of the direct testimony seemed to be to take the sting out of what Zilis and the plaintiff’s lawyers had to know was coming. So she told the court that her role also meant telling Altman when Musk was “in a good headspace” for a conversation — perhaps inadvertently strengthening Brockman’s testimony Tuesday that at one point he feared Musk would physically attack him — while vehemently denying that she funneled information to Musk.