Elon Musk on Thursday sparred with an attorney for OpenAI during his third day of testimony in the contentious trial over the company’s pivot from non-profit status to a for-profit venture valued at hundreds of billions of dollars. The trial centres on the 2015 birth of the ChatGPT maker as a non-profit start-up primarily funded by Musk. It pits the world’s richest person against Sam Altman, a fellow OpenAI co-founder he accuses of betraying promises to keep the company as a non-profit dedicated to humanity’s benefit.