OpenAI updated the default model for ChatGPT to its new GPT-5.5 Instant, along with a new memory capability that finally shows which context shaped responses — at least some of them. 
This limitation signals that models are starting to create a second, incomplete memory observability layer that could conflict with existing audit systems and agent logs. 
GPT-5.5 Instant replaces GPT-5.3 Instant as the default ChatGPT model and is a version of its new flagship GPT-5.5 LLM. It’s supposed to be more dependable, accurate and smarter than 5.3. 
But it’s the introduction of memory sources, which will be enabled across all models in the platform, that could help enterprises in their projects. 
“When...