I don't think OpenAI is a nonprofit as they are planning to commercially license their technologies. Ok, they limit investor returns at one-hundred times their initial investment, but I'd hardly call that a non-profit in the sense of the word.
When it was founded in 2015, OpenAI was originally a nonprofit, but restructured into this new arrangement earlier this year in order to be able to raise VC money: https://techcrunch.com/2019/03/11/openai-shifts-from-nonprof...