Sébastien Bubeck
OpenAI author on gpt-oss and GPT-5 science work; earlier a Microsoft GenAI vice president and Phi co-author
- Listed with an OpenAI affiliation on the November 2025 paper "Early science acceleration experiments with GPT-5", OpenAI19
Sébastien Bubeck is first author of "Early science acceleration experiments with GPT-5" (2025), written with an OpenAI affiliation, and is among the authors of the 2025 model card for OpenAI's open-weight gpt-oss models. Earlier, as a vice president in Microsoft GenAI, Bubeck co-authored the technical reports for phi-1, phi-1.5, Phi-3, and Phi-4, Microsoft's small language models, and was a listed contributor to Phi-2; the Phi-4 model card on Hugging Face lists the MIT license. Bubeck was also first author of the 2023 "Sparks of Artificial General Intelligence" study of an early version of GPT-4.196234578
Work
Phi small language modelsOpen weights
Co-author of the phi-1 (2023), phi-1.5 (2023), Phi-3 (2024), and Phi-4 (2024) technical reports, and a listed contributor and author of the Microsoft Research blog post announcing Phi-2. The Phi-3 report describes phi-3-mini as small enough to be deployed on a phone, and the Phi-4 model card on Hugging Face lists the MIT license.234567
gpt-ossOpen weights
Listed among the authors of the gpt-oss-120b and gpt-oss-20b model card (2025), which presents two open-weight reasoning models; the gpt-oss-20b model card on Hugging Face lists the Apache 2.0 license.910
Early science acceleration experiments with GPT-5 (external site: arxiv.org)Published research
First author of the 2025 collection of case studies in which GPT-5 contributed concrete steps to ongoing research in mathematics, physics, astronomy, computer science, biology, and materials science.1
Sparks of Artificial General Intelligence (external site: arxiv.org)Published research
First author of the 2023 paper reporting experiments with an early version of GPT-4 while it was still in development by OpenAI.8
Other documented roles
Roles the sources document but that are not confirmed as current.
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