Locked chats let you keep selected conversations in your account while hiding them from regular chat history, pinned chats, and search. Open them with your 4-digit account PIN or supported device authentication. Your retention and model-improvement settings stay unchanged.Locked chats are rolling out gradually to Free, Go, Plus, and Pro users on the web, in the iOS and Android apps, and in thenew ChatGPT desktop appfor macOS and Windows. To lock a chat, open a chat’s more options menu (•••) and selectLock chat.Learn more about locked chats.