OpenAI has hired Mike Liberatore, former finance chief at Elon Musk's xAI, to be the artificial intelligence startup's business finance officer, responsible for overseeing its AI infrastructure, a company spokesperson told Reuters on Tuesday. Liberatore, who left xAI in July after just three months on the job, will report to CFO Sarah Friar and work with Greg Brockman's team, which is charged with scaling OpenAI's access to compute, the spokesperson said. CNBC, which first reported the news,