Fidji Simo, CEO of OpenAI’s AGI Deployment and the company’s second executive, will leave her full-time role following a three-month medical leave, she said in a note in X on Thursday.

“Three months ago, I had to take medical leave after a serious exacerbation of a chronic illness I’ve lived with for seven years,” he wrote on

Simo will move to a part-time role within the company and said he believes the best use of AI is to help cure diseases. She thanked CEO Sam Altman, President Greg Brockman and the company’s board of directors for supporting her during her leave, which began in April.

“More than ever, I believe some of the biggest opportunities for AI lie in helping people solve real problems in their daily lives: their health, their finances, their time, and the everyday burdens that shape the human experience,” he wrote, later adding: “For now, my focus is on recovery. But my belief in technology’s potential to solve deeply human problems has never been stronger.”

Simo’s departure came later