Most things aren't in a massive boom and most people aren't that involved in AI. This is a rare example of great communication in marketing - they're telling people who might not be across this field what is going on.

> Why would they publish a model that is not their most advanced model?

I dunno, I'm not sitting in the OpenAI meetings. That is why they need to tell us what they are doing - it is easy to imagine them releasing something that isn't their best model ever and so they clarify that this is, in fact, the new hotness.