Google has taken its most celebrated AI leader out of the day-to-day command of DeepMind at precisely the moment the company can least afford uncertainty. The move is being sold as a scientific liberation; outside the company, it is also being read as an alarm bell.

For years, Hassabis balanced DeepMind’s research culture with Google’s increasingly urgent push to turn AI into products. That strain grew as Gemini 3.5 Pro slipped behind schedule, while OpenAI and Anthropic released stronger models—particularly in the lucrative coding race.¹

On Wednesday, Google made the split formal: Hassabis ceded the DeepMind CEO job to chief technology officer Koray Kavukcuoglu, who will run the unit as senior vice-president and report to Sundar Pichai. Hassabis becomes Alphabet’s chief scientist and DeepMind chair, while continuing to lead Isomorphic Labs. Pichai framed it as a way to give him more room to shape the future of the technology.Sundar Pichai (sundarpichai)²

Hassabis’s own rationale is unmistakably long-range. He told colleagues he was handing over operational duties to gain “the time and space to focus on the big picture,” and argued that getting the approach to AGI right was critical to “an incredible new age of discovery and wonder.”³ Insiders sympathetic to the change say it frees the AlphaFold architect to pursue breakthroughs such as scientific discovery rather than chatbots and internal management.

But the announcement landed alongside another jolt: Jeff Dean, Google’s chief scientist and a 27-year veteran, is leaving with Sanjay Ghemawat and other researchers to launch Discovery Loop. Pichai called Dean “incomparable” and said Google would support the new public-benefit company.Sundar Pichai (sundarpichai)⁴

That combination has fed a harsher interpretation. Critics point to delayed releases, departures including Gemini and AlphaFold talent, and a stock drop after the reshuffle as evidence that Google is surrendering operational cohesion just as competitors press their advantage. Employees, meanwhile, mixed tributes and “Jeff Dean Facts” memes with a blunt verdict on the internal message board: “Sad day for Google.”⁵

The dispute is not over Hassabis’s stature. It is over whether Google has placed its best scientific bet for the next era—or removed a crucial leader from the fight it is already losing.