Kevin Weil and Bill Peebles exit OpenAI as company continues to shed ‘side effects’

OpenAI is losing two of its most ambitious developers. Kevin Weil, who led the company’s scientific research, and Bill Peebles, the researcher behind the AI ​​video tool Sora, both announced their departures on Friday. The results come as OpenAI integrates around the AI ​​business and its own coming “superapp.”

Departure follows OpenAI’s concept of reducing “side quests“Combining bets on clients like Sora and OpenAI for Science. Sora, which lost about $1 million a day in accounting, he was they closed last month.

OpenAI for Science was the internal research team behind it Prisman AI-powered platform that promised to accelerate scientific discovery. It is involved in “other research groups,” according to Weil’s social media post to announce the news.

“It’s been two years of developing ideas, from Chief Product Officer to joining the research team and starting OpenAI for Science,” Weil wrote. “The advancement of science will be one of the best outcomes of the push toward AGI.”

The group had a short and difficult road after the announcement in October 2025. Weil deleted the tweet that said GPT-5 had. solved 10 Erdős that have not been solved before math problems, but that statement fell apart immediately when the mathematician who runs the website erdosproblems.com called.

Weil’s departure comes a day after his team released GPT-Rosalinda new model for accelerating life science research and drug discovery.

In a social media post in announcing his departure, Peebles praised Sora for introducing “a lot of video investment across the industry,” and said the kind of research that created the video tool needed a place away from the company’s mainstream strategy.

“Increasing entropy is the only way to make a research lab sustainable in the long term,” he wrote.