What is chat-latest? A complete analysis of the OpenAI GPT-5.5 Instant rolling alias and its 7 major improvements
In May 2026, OpenAI quietly swapped the default model for ChatGPT to GPT-5.5 Instant. At the API level, this corresponds to a rather peculiar name: chat-latest. It lacks a version number or a date suffix—it’s just a fixed "latest" string. Yet, every time you call it, the underlying model might be silently changing behind the…
