Google reshuffles its AI leadership, and four of its most famous engineers walk out the door
Demis Hassabis moves from Google DeepMind CEO to Alphabet chief scientist, while Jeff Dean, Sanjay Ghemawat, Oriol Vinyals and Quoc Le leave to start a company called Discovery Loop. The flagship Gemini model is still not out.
Alphabet announced a leadership overhaul of its AI division on Wednesday. Demis Hassabis, the Nobel laureate who co-founded DeepMind in 2010 and has run Google’s AI lab since 2023, is stepping out of his main managerial role. He becomes Alphabet’s chief scientist, a newly created title, and shifts from Google DeepMind CEO to chairman. On the same day, four of Google’s best known engineers left the company altogether.
Jeff Dean, Sanjay Ghemawat, Oriol Vinyals and Quoc Le have gone to launch a startup called Discovery Loop, structured as a public benefit corporation and focused on breakthroughs in machine learning, science and engineering. Google itself invested in it, and Google Cloud signed a partnership to supply the compute. Koray Kavukcuoglu, until now the unit’s chief technology officer, takes over day to day responsibilities, though with the title of senior vice president rather than CEO.
Hassabis told staff the change was about the closeness of AGI, meaning artificial general intelligence, the hypothetical point where a system is broadly as capable as a person across most tasks. He said he wants to spend his time on the research and societal questions around it, and more time on Isomorphic Labs, the drug discovery company he founded out of DeepMind. “I’ve always believed the No.1 application of AI should be to improve human health,” he wrote.
What is actually going on here
The timing is what makes people nervous. The flagship version of Google’s newest Gemini model was planned for June and still has not shipped. Hassabis referred in his memo to “great progress” on an unreleased upgrade called Gemini 4, which is the first time that name has surfaced in an official note. Meanwhile Google has been losing senior people all year: Noam Shazeer left for OpenAI in June, and Nobel co-laureate John Jumper said the same week he was joining Anthropic. Alphabet gave no explanation for why all of this landed on one Wednesday.
It is worth resisting both easy readings. This is not obviously a company falling apart, since Gemini 3 in November was widely seen as pulling level with the best models from OpenAI and Anthropic. But it is also not a routine reorg. Google spent this year’s developer conference talking about Gemini being cheap rather than being best, which is the kind of thing a company says when it is not first.
What this means for you: nothing changes in Gemini today, and your Google account, Search and Workspace work exactly as they did yesterday. If you are casually curious about AI, the useful takeaway is that the people building these systems move around constantly, and a lab’s reputation can lag its actual bench strength by a year. If you are choosing tools for real work, this is a mild argument for not betting everything on one provider, especially if a promised model keeps slipping. Watch for whether Gemini 4 actually ships this autumn. That will tell you far more than any org chart.
Sources
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