Two years after Google spent billions to bring him back, the person running Gemini is walking out the door.
Noam Shazeer, who has co-led Google's Gemini model since 2024, announced on X on Thursday that he is leaving for OpenAI. Google confirmed the departure to Reuters, saying only that it was "grateful for Noam's meaningful contributions" and otherwise declining to comment.
If the name doesn't ring a bell, the work probably does. Shazeer was one of the eight Google researchers behind "Attention Is All You Need," the 2017 paper that introduced the Transformer. Pretty much every chatbot you've used, including ChatGPT, Claude and Gemini itself, is built on that idea. He left Google in 2021 to co-found Character.AI after the company reportedly refused to release a chatbot he had built internally.
Then in August 2024, Google paid roughly $2.7 billion to get him back. The deal was structured as a non-exclusive license to Character.AI's models plus the movement of about 30 researchers, Shazeer included, into Google DeepMind. He took over as co-lead of Gemini alongside Oriol Vinyals. Most of that $2.7 billion actually went to Character.AI's investors, who walked away with returns between 2.5x and 12.5x. Shazeer got the leadership seat on Google's most important AI project.
Two years later, that arrangement is over. In an internal memo seen by CNBC, Demis Hassabis told DeepMind staff that more details on the transition were coming. Sam Altman welcomed Shazeer publicly on X, saying it had taken ten years to make the hire happen. OpenAI's chief research officer Mark Chen said Shazeer would lead architecture research at the company.
What Google didn't get for its $2.7 billion is the one thing it needed most: a way to keep him. California makes non-competes effectively unenforceable, so the package was all incentive and no lock-in. When someone like Shazeer decides he wants to work somewhere else, no contract stops him.
That is the bigger problem here. AI talent retention is no longer something the biggest checkbook automatically wins. Meta has reportedly been offering individual signing bonuses of up to $100 million to poach OpenAI researchers. Across recent AI deals, the average cost per acquired engineer sits around $59 million. The numbers buy access, not loyalty. Shazeer himself has said what keeps him interested is the research problem, telling The Batch once that language modeling "feels like the perfect research problem." Google had the money. OpenAI apparently has the problem he wants to work on next.
Google still has Hassabis, Jeff Dean, Vinyals and a deep enough bench that Gemini isn't suddenly leaderless. The message this sends to the rest of the AI talent market is what actually matters. If $2.7 billion can't keep the inventor of the Transformer in his chair for more than 24 months, no number is enough to lock anyone in. Frontier AI is being run by a few hundred people who can basically pick their employer on a given Tuesday. Google just learned that the hard way, and OpenAI is going to learn the same lesson eventually, just from the other side of the door.
