OpenAI announced Sam Altman has departed the company on Friday. Chief Technology Officer Mira Murati has been appointed interim CEO to lead OpenAI. The news comes just weeks after OpenAI’s DevDay, where Sam Altman announced some of the company’s biggest advancements yet.

“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,” said the company in a statement Friday. “The board no longer has confidence in his ability to continue leading OpenAI.”