Elon Musk's 'Mole' or Mother of Four? Shivon Zilis Tells Court How Starlink CEO Offered Sperm Donation

Elon Musk and Shivon Zilis were thrust into view in a federal courtroom in Oakland, California, on Wednesday, where Zilis testified for hours in Musk's lawsuit over OpenAI's shift towards a for profit structure and described how he offered to donate sperm in 2020, leading to the birth of their children. Her evidence ranged from boardroom disputes to intensely private decisions, giving the case an unusually personal edge.

Zilis was not in court simply because of her relationship with Musk. She has worked across Silicon Valley for more than 15 years, held senior roles at Tesla and Neuralink, joined OpenAI as an adviser in 2016 and later served as a director from 2020 to 2023. That overlap made her a significant witness in a case that has become, at heart, a fight over money, control and the future shape of one of the world's most powerful AI companies.

Elon Musk, Shivon Zilis And The Offer She Described

Zilis told the court that her path to motherhood did not unfold in the way she had once expected. She said she had been dealing with health issues that disrupted what she called a more traditional plan to marry and have children with a romantic partner.

Then, as she explained it, Musk intervened with an offer that was startling in its bluntness and apparently simple in its terms.

'I still really wanted to be a mum and Elon made the offer around that time and I accepted,' she said. She added that Musk had been 'encouraging everyone around him at that time to have kids' and had noticed that she did not have any. 'He offered to make a donation,' she told the court.

There was, she said, no ongoing romance behind that decision. Zilis described a 'one off' romantic encounter with Musk about a decade ago, but said they were not romantically involved in 2020 when he first offered to father her children.

She also said the two agreed to keep his paternity of their first two children 'strictly confidential.' At the time, Musk was not necessarily expected to play an active fatherly role in their lives. That, too, changed. Zilis told the court that he is now an active participant in the lives of their four children and that they spend a few hours each week together as a family.

Why Elon Musk, Shivon Zilis Matter In The OpenAI Case

The personal detail was striking, but it was not the legal centre of gravity. OpenAI's lawyers have suggested that Zilis passed information to Musk after he left the company in 2018, a serious implication given that he was a co founder, an early donor and, by then, an outsider with a direct interest in what OpenAI might become.

Zilis said the confidentiality agreement with Musk was the reason she did not tell OpenAI chief executive Sam Altman that the twins she gave birth to in 2021 were fathered by Musk. She said she informed Altman the following year, when she learned that a Business Insider report on Musk's paternity was about to be published. Even after that, she testified, Altman and OpenAI president Greg Brockman wanted her to remain on the board, and the three stayed friends until at least 2023.

Brockman's own words, quoted earlier in the week, were notably calm for a situation that now looks anything but tidy. 'We trusted her to keep the Elon conflict under control,' he said. It is an almost understated sentence for a dispute now packed with court filings, private messages and competing accounts of who wanted what from OpenAI and when.

Those exchanges appear to be central to the case. The documents shown in court, senior figures at OpenAI were already discussing a move away from a pure non profit structure as early as 2017 because the company would need to raise many billions of dollars to grow. Brockman and co founder Ilya Sutskever were pushing for a B Corp model, while Musk, according to emails from Zilis, wanted more control through extra board seats and even floated the idea of making OpenAI part of Tesla.

In one written exchange shown in court, Zilis said such a move for OpenAI 'solves the funding issue immediately.' It did not happen. The evidence also included an email from Zilis saying Altman, Brockman and Sutskever could not agree terms with Musk largely because they were adamant he should 'not have control' of OpenAI's work.