Recently OpenAI added an additional memory feature called “chat history”, which allows ChatGPT to reference past conversations. The details of the implementation are not known. The documentation highlights that: “It uses this to learn about your interests and preferences, helping make future chats more personalized and relevant.”
I decided to spend some time to figure out how it works.
https://embracethered.com/blog/posts/2025/chatgpt-how-does-chat-history-memory-preferences-work/