Documents the AI builds

The feature this site keeps pointing at has two names and one job: writing & code blocks (ChatGPT) · Artifacts (Claude) — a live document the AI writes beside the chat in one product, as editable blocks inside it in the other — which you edit directly instead of asking for "the same thing again, but with point four fixed." Edit-in-place is the fixture. Where it sits moves with redesigns; the decoder keeps the current pair, dated.

Why it matters to the window: every "try again" in a plain chat piles a fresh copy of the draft into the pile, and copies compete. An editable document holds one current version outside the conversation, so a revision changes the thing instead of growing the thread. Change a line by hand, ask for one section to be rewritten, and watch it update in place rather than the chat growing a fourth copy.

When the document is finished it stops being chat furniture and becomes material: save it where the next window can read it — into the project's files, or a home outside the tool entirely (source of truth) — and reference it from a new chat by pasting or attaching it. The chat that produced it is the script of how you got there; the document is the thing you use.

Say it back in one line: what does an editable document keep out of the window that re-prompting puts in?