OpenAI gives ChatGPT a new dreaming memory system to retain preferences across conversations.

The big deal is that memory is becoming an active system， not a passive note file.

Earlier memory worked like a sticky note： it mostly remembered things you explicitly told it to remember， and those notes could become stale. If you said you were going to Singapore in July， the system might keep treating that as a current plan even after the trip ended.

Dreaming changes the model from "saving notes" to "maintaining a picture." It looks across past conversations， extracts what still seems useful， updates what has changed， and makes that summary visible so users can review or correct it.

It measures factual recall： when a user asks something that depends on earlier chats， can ChatGPT correctly bring back the relevant personal context？