Nov 12 (Reuters) - OpenAI co-founder Greg Brockman has

returned to the artificial intelligence startup three months

after taking a leave from his role as president, he said in a

post on X on Tuesday.

An OpenAI spokesperson confirmed Brockman's return.

Brockman has been working with CEO Sam Altman on

creating a new role for him to focus on significant technical

challenges, Bloomberg News said, which first reported on the

development.

He posted on X, "longest vacation of my life complete.

back to building @OpenAI."

His return to OpenAI comes after a series of departures

at the Microsoft ( MSFT )-backed company, including its former

Chief Technology Officer Mira Murati, co-founder John Schulman

and co-founder Ilya Sutskever. Sutskever and Murati have now

founded their own AI startups.

Altman also returned to the helm of OpenAI in November

2023, after a brief, tumultuous period following his ouster by

the company's board, which had given scant explanation for

firing him.