Former OpenAI CTO Mira Murati's AI startup Thinking Machines Lab has lost three key employees to OpenAI. Co-founders Barret Zoph and Luke Metz and senior member Samuel Schoenholz have rejoined the Sam Altman-led firm after working with Thinking Machines for over a year. Murati said Zoph, who was also the CTO, will be succeeded by Soumith Chintala.