Microsoft said Monday that its vice president of GenAI research, Sebastien Bubeck, is leaving the company to join OpenAI, maker of ChatGPT.

It was unclear what role Bubeck would take on the Microsoft-backed AI startup.

“Sebastian has decided to leave Microsoft to continue his work on AGI development,” a Microsoft spokesperson said, adding that the company looks forward to continuing its relationship through Bubeck’s work with OpenAI.

Bubeck did not immediately respond to a Reuters request for confirmation.

Most of Bubeck’s co-authors who worked on the research paper on Microsoft’s Phi LLMs, which are smaller than traditional large language models (LLMs), remain at Microsoft and plan to continue developing the models, according to information that first reported his departure.

The development follows a series of departures from OpenAI, including that of longtime chief technology officer Miro Murati in September.

CEO Sam Altman denied any connection between the departures and the company’s planned restructuring.

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