OpenAI pushed out co-founder Sam Altman as chief executive officer, saying he wasn’t being “consistently candid in his communications” with the artificial-intelligence company‘s board.

The startup said Friday that its board concluded after a review that Altman’s actions, which it didn’t specify, were “hindering its ability to exercise its responsibilities.” The company’s statement, unusually candid for such a situation, said: “The board no longer has confidence in his ability to continue leading OpenAI.”