Pledged $30 million, $10 million per year for three years, but most likely only $20 million received. Elon Musk gave $40 million. There is also $70 million in mystery "other income" in the 990's that is missing the required explanation (nature and source.)

OpenAI is operated at a public charity and is required to meet a "public support test" of 33%, so Musk could not have given his $40 million without the $20 million from Open Philanthropy, an EA supported public charity. In fact, most of Open Philanthropy's money went to OpenAI.

Public charities are also required to have less than a majority of the board be employees or relatives of employees. For a while, after Elon Musk was removed, Holden Karnofsky of Open Philanthropy was the only non-employee on the board.