After some experimentation, my impression is that it generates smoother and more polished than before but not significantly better. Very dull music.

So the main thing it seems like it is able to do it take very granular song direction. The 4.0 model didn't stick very well to song direction. It "might" put a "bass drop" where you wanted it, etc.

Seems like the new 4.5 both listens to more nuanced song style descriptions as well as in-line direction better. Still not perfect, but it is an improvement. It's pretty incredible.. it is a huge improvement. Take a look at this example (It does have some errors, like a heard it sing one of the sound directions): https://suno.com/s/xaJNWNZSH17wAano

This is going to open up a lot of creativity where while you are still often at the mercy of the random number generator, you can really shape the song more.

Warning: audio autoplay (wtf?)