(1) 11/29 text-davinci-003 (2) 11/30 ChatGPT (3) 12/20 JasperAI Chat (4) 12/22 Replit Ghostwriter Chat (5) 12/23 YouSearchEngine Chat Wild guess: (i) (3-5) are using (1,2) with either in-context learning or (some) fine-tuning. (ii) OpenAI has an early-access partner program.