ChatGPT memory, hidden as “Project Sunshine” and found by @btibor91 — confirmed
@btibor91 tied the codename to memory on Dec 19, 2023. OpenAI announced memory in February 2024.
Leaked on 19 December 2023

On Dec 19, 2023, @btibor91 posted that ChatGPT’s “Project Sunshine” was ChatGPT with memory plus a new GPT Store layout.
OpenAI launched the GPT Store on Jan 10, 2024, TechCrunch reported. On Feb 13, 2024, Wired reported that OpenAI was giving ChatGPT a memory.
Confirmed for both features.