OpenAI rolls out improved memory for ChatGPT free tier

OpenAI has enhanced ChatGPT's memory feature with a new architecture built on dreaming. The update allows the model to generate a memory summary visible to users on free tiers. Users can now add, update, and control when ChatGPT references personal information. This improvement builds on the dreaming system and is part of the GPT-5.5 Instant release. The memory summary complements the memory sources feature available in GPT-5.5 Instant.