Sam Altman will return to the board of OpenAI after a review into the events that lead to his dramatic ousting from the ChatGPT maker found no evidence that he should have been sacked.

Altman was fired as chief executive and removed from the board of the artificial intelligence company he co-founded in November. The remaining board members reversed course days later, reinstating him as chief executive and stepping down instead.

A subsequent review into the boardroom chaos concluded there had been a significant breakdown of trust between the previous board and Altman, but found no evidence that the chief executive had misled investors or pushed product releases at an unsafe pace, according to former Salesforce boss Bret Taylor, who was appointed as an OpenAI director after the previous board was disbanded.