Fidji Simo, OpenAI's CEO of applications, announced several leadership changes on Friday and revealed she is taking a significant medical leave because of a worsening neuroimmune condition . OpenAI hired Simo in May, and she told staffers in a memo on Friday that her condition relapsed a few weeks before she started in the role. She said the past month has been "particularly rough health-wise," and she decided she needs to take several weeks off to recover. "For my entire time here, I've