Jeff Dean exits Google, DeepMind reshuffles
Jeff Dean and three researchers left Google to start Discovery Loop; Kavukcuoglu now runs DeepMind day to day as Hassabis moves to Alphabet chief scientist.
Google announced a major AI leadership reshuffle on August 5. Chief Scientist Jeff Dean, Google’s 30th employee with a 27-year run at the company, is leaving to launch a new startup, Discovery Loop, alongside senior fellow Sanjay Ghemawat, Google Brain co-founder Quoc Le, and Gemini co-lead Oriol Vinyals. Discovery Loop is a public benefit corporation focused on using AI to automate scientific and engineering experimentation; Alphabet is among its investors, alongside Radical Ventures, Khosla Ventures, Kleiner Perkins, and Lightspeed.
CEO Sundar Pichai said in a statement:
After an incredible 27-year run, Jeff Dean is at a moment where he wants to try something new, and we’re excited to support him in that.
The departures leave a leadership gap at the top of Gemini development. Koray Kavukcuoglu, previously DeepMind’s chief technology officer, is promoted to run Google DeepMind day to day, reporting directly to Pichai, and is leading development of Gemini 4. Demis Hassabis moves from DeepMind CEO to chairman of the unit and becomes Alphabet’s chief scientist.
Alphabet shares fell more than 4% the day of the announcement. The shakeup lands while Gemini 4 remains unreleased months after Google first confirmed the pretraining run was underway, and as Google bets on scaling Gemini now while banking on Gemini 4 for later.
What it means for you
Four senior researchers who shaped Google’s search and AI infrastructure just left to build outside it, with Google’s own money following them. That is not, on its own, a signal that Gemini development is in trouble. But it does mean the team now shipping Gemini 4 looks different from the one that started it, at a moment when Anthropic and OpenAI are both shipping on a faster cadence. If you route work to Gemini or are weighing it against Claude Opus 5 or GPT-5.6, treat Google’s near-term release timeline as less certain than it looked last week, not more.