Barret Zoph and Luke Metz, cofounders of Thinking Machines Lab, are returning to OpenAI, alongside Sam Schoenholz. Their departure comes as part of a trend within the lab, as Andrew Tulloch also left for Meta in October. Fidji Simo, OpenAI's head of apps, announced the news via a post on X, highlighting the movement of talent between these notable organizations. Thinking Machines Lab, founded by Mira Murati—another former OpenAI executive—has gained significant attention in the tech world. The startup is reportedly valued at around $50 billion, reflecting strong financial backing and ambitious goals. Despite this valuation, the recent exits of key personnel raise questions about the lab's stability and future direction. The loss of these cofounders could impact its operations, especially as it competes in an increasingly crowded AI landscape.