Noam Shazeer, one of the most consequential figures in modern artificial intelligence, is reportedly joining OpenAI after departing Google. If confirmed, the move would represent one of the most significant talent shifts in the AI industry’s history, pulling a foundational researcher away from the company where he helped build the very architecture that powers today’s large language models.

Shazeer isn’t just another senior engineer switching teams. He co-authored the 2017 paper “Attention Is All You Need,” which introduced the transformer architecture. That paper is, without exaggeration, the technical blueprint behind virtually every major AI model in existence today, from OpenAI’s GPT series to Google’s own Gemini.

A career defined by restlessness and breakthroughs

Shazeer’s relationship with Google has been, to put it mildly, complicated. He originally left the company in 2021 after Google declined to release his Meena chatbot. The decision frustrated Shazeer enough that he walked away to co-found Character.AI, a conversational AI startup that would go on to reach a $1 billion valuation and attract over 20 million monthly active users.

Then came the plot twist. In August 2024, Google effectively bought him back. The company struck a licensing deal for Character.AI’s technology worth approximately $2.7 billion, a transaction that brought Shazeer and a small team of engineers back into the fold. Shazeer himself, who owned an estimated 30-40% of Character.AI, reportedly received between $750 million and $1 billion from the arrangement.

Upon his return, Google installed Shazeer as co-lead of the Gemini project, its flagship AI initiative. He was also elected to the National Academy of Engineering in early 2026.

Why this matters beyond a job change

It’s worth noting that as of early 2026, public records and professional listings still identified Shazeer as being affiliated with Google DeepMind. His Gemini co-leadership role appeared intact, and no collaborative work with OpenAI had surfaced publicly. The timing and circumstances of any transition remain unclear.

For Google, losing Shazeer again would be particularly painful. The company spent $2.7 billion in 2024 specifically to bring him back. For OpenAI, the acquisition of Shazeer would represent gaining the co-lead of Gemini and a co-author of the transformer architecture.