Gemini's core developer Dustin Tran announced yesterday that he is leaving Google DeepMind to join xAI for the development of the next-generation Grok. Musk promptly retweeted the post, confirming the news. Dustin Tran has worked at Google DeepMind for eight years and is a core developer of the Gemini series models, having participated in the development of Gemini 1 to the latest models. He chose to join xAI due to its massive computational power and has been involved in the development of Grok 4 Fast.