Sam Altman is no longer the CEO of OpenAI after losing support of the board, according to a blog post from the company.

Soon after news broke of Altman’s departure from the company, he took to X, formerly Twitter, to call his time at OpenAI “transformative.”

Altman co-founded OpenAI in 2015 before later becoming CEO of the company behind ChatGPT. He has been credited by many people for helping usher in the AI boom.

In its announcement, OpenAI said Altman has departed as CEO and will also leave the company’s board of directors. Mira Murati, OpenAI’s chief technology officer, will serve as interim CEO while a search is conducted for a permanent successor.

“Mr. Altman’s departure follows a deliberative review process by the board, which concluded that he was not consistently candid in his communications with the board, hindering its ability to exercise its responsibilities,” the OpenAI blog post said. “The board no longer has confidence in his ability to continue leading OpenAI.”

Sam Altman, then-CEO of OpenAI, is pictured Thursday at the Asia-Pacific Economic Cooperation (APEC) Leaders’ Week in San Francisco, California. Altman on Friday was ousted from the company.

Altman’s X message was brief but indicated he would speak more later on his plans.

“I loved my time at OpenAI. It was transformative for me personally, and hopefully the world a little bit. Most of all, I loved working with such talented people,” he wrote. “Will have more to say about what’s next later.”

This is a breaking story and will be updated as more information becomes available.