This is huge: "Rather than the classic ChatGPT personality with a fixed verbosity, tone, and style, developers (and soon ChatGPT users) can now prescribe their AI’s style and task by describing those directions in the 'system' message."
It already exists, but according to their docs current chatGPT "does not always pay strong attention to system messages. Future models will be trained to pay stronger attention to system messages"
Instead of one large prompt there's now 'system', 'user', and 'assistant' prompts which are meant to be given specific instructions each. So you could tell the system prompt that it's a librarian and ask the message prompt what date a book was published.
