“[pro tier] ChatGPT effectively maintains a detailed summary of your previous conversations, updating it frequently with new details. The summary then gets injected into the context every time you start a new chat.”

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https://simonwillison.net/2025/May/21/chatgpt-new-memory/

I very much prefer the Perplexity Spaces approach. This needs to be under user control: it would stop me using CGPT. But for most users it is probably an improvement.

“Has there ever been a consumer product that’s this capable of building up a human-readable profile of its users?”