A number of OpenAI executives are transitioning into new roles, including COO Brad Lightcap, who will now lead "special projects" that involve complex deals and investments across the company. Denise Dresser, who recently joined OpenAI as Chief Revenue Officer, will take over some of Lightcap's duties in the interim. Meanwhile, OpenAI CEO Fidji Simo will be on medical leave to address a neuroimmune condition. Kate Rouch, the company's marketing head, will also be stepping aside to focus on cancer recovery.