New Delhi, March 29 -- The last of Elon Musk's original co-founding team at xAI has now left the company. Ross Nordeen, one of 11 people who built the artificial intelligence startup alongside Musk from its earliest days, departed on Friday, according to people with knowledge of his exit. His employee badge on X, the social media platform Elon Musk owns, has since been removed.

Nordeen's departure completes a near-total turnover of xAI's founding cohort. Since January, eight co-founders have walked out of the door - a remarkable rate of attrition at a company that has been valued at around $250 billion and bills itself as a serious challenger in the global AI race.

At xAI, Nordeen was not a figurehead. The 36-year-old Michigan Tech grad...