When the AI was writing a long page into a Canvas and its answer was cut off partway, the page was lost, and the same attempt was often repeated and cut off again. Now what was already written is saved as your Canvas, and the AI goes on to finish it. Every reply also has a length limit sized for the job, with more room when the AI writes a page or a document, so a single answer can no longer run on for many minutes and cost far more than you expected. A text reply that reaches the limit keeps its Continue button.