OpenAI — Founded Date: Dec 2015

Note: The source text is dated 'December 11, 2015' and is titled 'Introducing OpenAI', which is the official announcement of OpenAI's founding. The claim states the founded date as '2015-12' (December 2015), which matches the source's specific date of December 11, 2015. The month and year are identical; the claim uses month-level precision while the source provides day-level precision, but this is not a contradiction—both refer to the same founding date in December 2015.