- Company that once stood unchallenged at the frontier of artificial intelligence finds itself scrambling to hold the line.
Alphabet’s artificial intelligence division underwent its most dramatic restructuring in years on Wednesday, as AI chief Demis Hassabis relinquished day-to-day control and several architects of the company’s flagship Gemini model — including legendary engineer Jeff Dean — walked out the door.
The twin shocks land at a moment of acute vulnerability for Google, which has watched rivals Anthropic and OpenAI steadily erode its once-commanding lead in the field it helped invent.
Demis Hassabis, the Nobel Prize-winning co-founder of DeepMind, will vacate his role as CEO of Google DeepMind and assume the newly created position of Alphabet chief scientist, he told staff in a memo. He will also become chairman of the AI unit he has led since Google acquired his London-based lab for roughly $650 million in 2014.
The restructuring elevates Koray Kavukcuoglu, DeepMind’s chief technology officer, into the role of senior vice president of the business unit — notably carrying that title rather than CEO — while also retaining his parallel position as Alphabet’s chief AI architect.
The distinction matters: it signals that the unit now sits more squarely inside Alphabet’s conventional management hierarchy rather than operating with the unusual autonomy Hassabis had long enjoyed.
In a company-wide memo, Alphabet CEO Sundar Pichai framed the move around the approaching horizon of artificial general intelligence — the point at which machines match or surpass human cognitive abilities across most domains.
“(Hassabis) and I have been long discussing a role that allows him to put his full attention on actively shaping the future of AGI,” Pichai wrote. “It’s work that is vitally important to Alphabet and humanity, and I can’t imagine a better person than Demis to do it.”
Hassabis echoed that sense of urgency in his own note. The proximity of AGI, he suggested, demands leadership wholly devoted to its implications — societal, ethical, and strategic. But the new role will carry few direct reports, an Alphabet spokesperson confirmed, raising questions about how much operational influence he will retain.
He also plans to spend more time with Isomorphic Labs, the drug discovery company spun out of DeepMind that he founded and still leads as CEO. “I’ve always believed the No. 1 application of AI should be to improve human health,” he wrote. “It’s time for AI to prove its unequivocal value to the world, and what better way to demonstrate that than to help finally cure diseases like cancer.”
The departure of architects
While Hassabis’s transition carries symbolic weight, the more destabilising blow may be the simultaneous departure of four of Google’s most decorated AI leaders. Jeff Dean, Sanjay Ghemawat, Oriol Vinyals, and Quoc Le have left the company to launch Discovery Loop, a startup structured as a public benefit corporation. Its mission: pursuing foundational breakthroughs in machine learning, science, and engineering.
Dean’s exit is particularly seismic. He co-founded Google Brain in 2011, the US-based AI research unit that operated in parallel to — and at times in tension with — Hassabis’s DeepMind for more than a decade.
Even before that, Dean and Ghemawat were already revered figures inside Google for collaborating on landmark infrastructure projects — MapReduce, BigTable, TensorFlow — that still form the backbone of the company’s computing empire.
When OpenAI’s ChatGPT blindsided Google in late 2022, Pichai responded by merging DeepMind and Google Brain into a single organisation called Google DeepMind in 2023. Hassabis was named CEO and Dean became chief scientist.
Together with Vinyals and Noam Shazeer, Dean oversaw Gemini’s development. Under that leadership, the November 2025 release of Gemini 3 was widely viewed as closing the gap with leading models from Anthropic and OpenAI.
But the momentum proved fleeting. Anthropic and OpenAI have since pulled ahead on key benchmarks, while cheaper Chinese open-source models have intensified competitive pressure from below.
At Google’s May developer conference, Pichai and other executives emphasised Gemini’s cost efficiency rather than its cutting-edge capabilities — a telling pivot.
Brain drain accelerates
The departures of Dean, Ghemawat, Vinyals, and Le come on the heels of two earlier losses that stung deeply. In June, Noam Shazeer left for OpenAI, less than two years after Google paid billions to acquire him and his team from the startup Character.AI.
The same week, senior research scientist John Jumper — who shared the 2024 Nobel Prize in Chemistry with Hassabis — announced he would join Anthropic.
Vinyals and Le, along with former OpenAI chief scientist Ilya Sutskever, co-authored a 2014 research paper that proved foundational to the modern AI era by establishing that scaling up data for “pre-training” could drive AI systems to unprecedented performance levels. Their departure, combined with Dean’s, strips Google DeepMind of an extraordinary concentration of institutional knowledge.
Discovery Loop has already secured investment from Google and entered a cloud computing partnership with the company — arrangements that suggest an amicable separation, or at least a carefully managed one. But the startup’s public benefit corporation structure also signals a desire for independence from the quarterly pressures that govern a publicly traded giant.
Behind the leadership changes lies a persistent tension: the friction between long-term scientific ambition and the commercial urgency of the AI arms race.
Kavukcuoglu’s elevation was greeted with relief by senior leaders inside Google Cloud, the company’s primary AI revenue engine, according to a source with direct knowledge. He had already been more deeply involved than Hassabis in collaborations between DeepMind and Cloud, and his appointment is expected to steer Gemini toward a more product-oriented trajectory.
That pivot carries urgency. The flagship version of Google’s latest Gemini model remains unreleased despite a planned June launch, feeding investor anxiety that the company is losing ground precisely when the market is accelerating.
Hassabis offered a nod to this in his memo, touting “great progress” on an unreleased upgrade called Gemini 4, but provided no timeline.