After an answer, Haruno may spend a moment saving lasting notes from the chat. You can leave the chat while it finishes. This page says what happens, what is kept and how to switch it off.
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After Haruno answers, it may look back over the conversation and save things worth remembering for later chats. This is a background review. It runs after the answer is already on your screen, so you do not wait for it.
You will not see it. There is no spinner, no message and no button. It only matters if you ask why Haruno remembers something in a later chat.
What it keeps
A review can add notes to Haruno's memory. It cannot change or delete a note that is already there. Changing or removing a memory takes you, in a conversation. If the memory is full, the review skips adding instead of making room.
Memory is the same one you control under Settings ▸ General ▸ Use memory, which "remembers durable preferences and details across chats". With that switched off, nothing is saved, and a review that Haruno is holding open is stopped.
A temporary chat does not use or update memory.
If you leave the chat
You can start a new chat, open another chat from History or switch project while a review is still going. Haruno keeps the finished chat running quietly so the review can finish. This lasts for up to three minutes, and at most two chats are held this way at once.
The held chat does nothing but its review. Stop and the busy indicator ignore reviews, so a chat that has finished answering looks finished.
Closing Haruno does not wait for a review and asks nothing. A review that gets cut off is not lost. Haruno tries it again after the next answer in that chat.
A review is also cut off when you:
delete or archive the chat
open that same chat again, or change it with Edit message
sign in with a different account
switch off Use memory, or switch off memory for that project
What to tell a customer
If someone says "Haruno kept working after I closed the chat", this is why. It is saving notes, not doing new work for them. To stop it, turn off Use memory.