Today, Toby Pollan, co-founder of Musk’s xAI, announced his resignation. In less than 3 years, 7 of xAI’s 12 co-founders have confirmed their resignation.Pollan posted on the X platform that today is his last day at xAI and praised his team:“You guys are awesome, no one can stay up as late as you.”
He plans to rest first, sleep for more than 8 hours, think about the future, and thank Musk for letting him join the team.
In his reply, Musk also thanked Pollan for helping xAI develop to its current stage.
According to the public information queried, the relevant information of the 7 people who have resigned is as follows:
Toby Pohlen (February 27, 2026): The latest co-founder to announce his departure. He briefly led the digital agent project Macrohard after the company restructured in February.
Jimmy Ba (February 11, 2026): Professor at the University of Toronto, he was responsible for the development of AI tutoring and the Grok 4 model.
Tony Wu (February 10, 2026): Former Google scientist, responsible for reasoning (Reasoning) related research at xAI.
Greg Yang (January 2026): Leaving the company due to Lyme disease and stepping away from day-to-day operations.
Igor Babuschkin (August 2025): Founded an AI security venture capital agency after leaving his job.
Christian Szegedy (February 2025): Former Google senior scientist.
Kyle Kosic (2024): Head of infrastructure, he was the first to leave Lianchuang and later joined OpenAI.