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.

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firasd an hour ago | parent [-]

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

	▲	simonw 18 minutes ago \| parent [-]
		It's SO hard to understand this. I couldn't confidently explain it at all.