Google Shakes Up AI Leadership as Hassabis Steps Back and Jeff Dean Departs After 27 Years

Alphabet reorganized the top of its AI division this week, and Wall Street didn't love it. Shares fell as much as 5% following the announcement, according to Business Insider, with Reuters and the Japan Times separately putting the decline at around 4%.

CEO Sundar Pichai announced the changes in a company blog post. Demis Hassabis, the Nobel Prize-winning co-founder and CEO of Google DeepMind, is stepping down from day-to-day management to become Alphabet's chief scientist and DeepMind's chairman. He remains CEO of Isomorphic Labs, the DeepMind drug-discovery spinout, according to the Guardian.

Taking over daily operations is Koray Kavukcuoglu, DeepMind's chief technology officer and Google's chief AI architect since 2012, before Google even bought DeepMind in 2014. He's now senior vice president of Google DeepMind and reports directly to Pichai.

Jeff Dean departs after 27 years

Jeff Dean, a 27-year Google veteran and one of the architects of the company's entire AI strategy, is leaving to launch a startup called Discovery Loop with fellow engineers Sanjay Ghemawat, Oriol Vinyals, and Quoc Le. Dean announced it himself on X, describing the venture as a public benefit corporation aimed at automating "machine learning, science, and engineering to accelerate discoveries and progress."

Google is investing in Discovery Loop and providing it cloud computing capacity, Reuters reported. That's an unusual arrangement for a company watching senior talent walk out the door to start a competitor-adjacent venture, but it suggests Google wants a stake in whatever Dean's team builds rather than treating the departure purely as a loss.

Dean's exit follows other high-profile departures from Google's AI ranks, including Noam Shazeer and John Jumper, who left for rivals, according to Ground News.

Google is losing the frontier race

OpenAI released GPT-5.6 and Anthropic released its Mythos model in recent months, both drawing praise for advanced capabilities, according to CNBC. Google's last true frontier release was Gemini 3.1 Pro in February. Reuters reported that a planned Gemini 4 release has been delayed, and CNBC noted Google assembled an internal "Code Strike" team specifically to catch up in AI coding, an area where Malik Ahmed Khan, senior equity analyst at Morningstar, told CNBC that OpenAI and Anthropic are "miles ahead" of Google.

Ben Wood, chief analyst at CCS Insight, told CNBC that Kavukcuoglu's promotion "feels like a move that is designed to adjust the focus of Google's efforts away from academic projects and more toward a stronger focus on improving frontier performance and improving the toolset for developers." A Google spokesperson pushed back on the idea the company had been distracted, telling CNBC that its AGI strategy always included robotics, world models, agents and coding, not just chatbots.

Not everyone sees this as bad news

Vinod Khosla, the Sun Microsystems co-founder, argued on X that Google remains "the real source of AI acceleration," pointing to early bets on Waymo and sustained AI investment as evidence the company's fundamentals are sound regardless of this week's stock dip. A 4 to 5% share drop on a leadership announcement is a market reaction to uncertainty, not proof the company is failing. Alphabet has also committed $205 billion in capital expenditures for 2026, according to Ground News, and Sergey Brin remains personally involved in Gemini development alongside Kavukcuoglu.

Pouladian, founder of AI infrastructure research firm BEP Research, framed the reorganization as Google wanting to "play to win," telling followers on X that elevating Amin Vahdat, the executive behind Google's TPU chip infrastructure, "is about streamlining the whole machine" with less internal politics and better compute allocation.

Internal tensions over Pentagon work

The Guardian's reporting adds detail largely absent from the business coverage: internal disquiet at DeepMind over its work with the Pentagon. A former DeepMind employee has filed a legal challenge against Google claiming they were unfairly dismissed over their views on Gaza, and another employee resigned in mid-July citing DeepMind's work with the Pentagon and the Department of Homeland Security, according to the Guardian. One employee told the paper that Hassabis's departure marked "the end of an era" and that DeepMind "has become just another subdivision" of Google rather than an independent research lab with its own mission.

A former Google executive told the Guardian the shift confirms "the era of DeepMind as an independent actor is over," contrasting Hassabis's status as "a charismatic founder-leader" with Kavukcuoglu's reputation as "a technical character, not an inspirational figure."

The restructuring resolves nothing about Google's core problem: no announced release date yet for the next major Gemini model. Reuters and Business Insider both note Gemini 3.5 Pro remains unscheduled. Whether centralizing power under Kavukcuoglu and tying DeepMind's research more tightly to Google Cloud's commercial arm actually produces a model that beats GPT-5.6 or Mythos is the open question the market will be pricing in with every future earnings call.