Former OpenAI exec Mira Murati’s startup, Thinking Machines Lab, is saying goodbye to two of its co-founders, both of whom are headed back to OpenAI. Another former OpenAI staffer who went to work for Murati’s startup is also headed back to the company. On social media on Wednesday, Murati announced the departure of Barret Zoph, the company’s co-founder and CTO. “We have parted ways with Barret,” Murati said in a post on X . “Soumith Chintala will be the new CTO of Thinking Machines. He is a