OpenAI co-founder and President Greg Brockman said he’s departing from the maker of generative artificial intelligence tools just hours after the board pushed out Chief Executive Officer Sam Altman.

“I’m super proud of what we’ve all built together since starting in my apartment 8 years ago,” Brockman wrote in a post on the social media site X. “We’ve been through tough & great times together, accomplishing so much despite all the reasons it should have been impossible. But based on today’s news, I quit.”

Earlier, the OpenAI board said was parting ways with Altman, also a co-founder and one of the most prominent figures in the AI world, after losing confidence in him as a leader.

“Genuinely wishing you all nothing but the best,” Brockman wrote in his post. “I continue to believe in the mission of creating safe (artificial general intelligence) that benefits all of humanity.”

In one of the moves announced earlier, Brockman was due to step down from his role as board chairman but stay on at the company, reporting to the new CEO.