NYT claims that OpenAI trained on their material. They argue for copyright violation, although I think another argument might be breach of TOS in scraping the material from their website or archive.

The complaint filing has some references to some of the other training material used by OpenAI, but I didn't dig deeply in to what all of it was:

https://nytco-assets.nytimes.com/2023/12/NYT_Complaint_Dec20...