Nothing in the ChatGPT model release notes yet: https://help.openai.com/en/articles/9624314-model-release-no...

(This is a subtle nudge at anyone from OpenAI who reads this to make sure they get updated.)

OpenAI have a model called "chat-latest" - I wonder if that's running this new model yet: https://developers.openai.com/api/docs/models/chat-latest

It's described as "points to the latest Instant model currently used in ChatGPT" - so presumably that's "GPT-5.6 Instant" in the app.

There’s no 5.6 instant I think — 5.6 Luna is gonna be the new instant tier model

No, Luna is the new free model.

https://gist.github.com/simonw/aae4febd3c6f7bc5b7811857edb3c... has screenshots that still show "Instant" as an option for ChatGPT Chat... but not for ChatGPT Work.

Hmm

It’s hard to understand this .. like sure we can select instant but is there an actual model called 5.6 instant? Like is it on LM Arena and OpenRouter or available via API etc

5.5 instant is definitely A Thing it’s even name checked in this OAI post

It's SO hard to understand this. I couldn't confidently explain it at all.