OpenAI's former research chief has been quietly building a startup that aims to bring manufacturing back to the U.S. using AI. Bob McGrew's newest company, Arda, has raised $230 million at a $1.5 billion valuation, the company told CNBC in an exclusive interview Tuesday. The round was led by Altimeter Capital, Accel and Khosla Ventures. Arda makes AI software to help automate manufacturing. McGrew, who was also Palantir's product and engineering lead for over a decade, said Arda's AI models have...