Zilis, who is also a longtime adviser to Musk, took the witness stand on the sixth day of his lawsuit against fellow OpenAI co-founders Sam Altman and Greg Brockman. Musk alleges the executives abandoned OpenAI’s original nonprofit mission in pursuit of profit and personal gain.

"I still really wanted to be a mum and Elon made the offer around that time and I accepted," she said, explaining Musk in 2020 had offered to donate sperm. "He was encouraging everyone around him at that time to have kids and he'd noticed I did not. He offered to make a donation," Zilis said.