A big job, like a long document or a game in a canvas, is written in parts, and each part used to end with a promise to carry on, so you typed “continue” every time. Now, when you ask the chat to keep going until the job is done, it starts the next part by itself, up to eight parts. Each part is checked and paid for like any message, a note says how many Runs the job has used so far, and Stop ends the job with everything saved so far kept.