OpenAI 2017 tax filings just became available, which detail its financials, including compensation information:

https://regmedia.co.uk/2019/05/02/openai_tax_2017.pdf

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It was reported by The Register last week, but somehow nobody else picked up on this yet:

https://www.theregister.co.uk/2019/05/03/open_ai_finances/

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Note the differences with the 2016 tax filings, which made national news last year:

http://990s.foundationcenter.org/990_pdf_archive/810/810861541/810861541_201612_990.pdf

https://www.nytimes.com/2018/04/19/technology/artificial-intelligence-salaries-openai.html