Fable: "create a visually interesting shader that can run in twigl-dot-app make it like an infinite city of neo-gothic towers partially drowned in a stormy ocean with large waves." "Make it better"
All of this is procedurally generated.
I had early access to Opus 4.8. Was impressed by it.
Here is Opus 4.8's one shot of "create a visually interesting shader that can run in twigl, make it like an infinite city of neo-gothic towers partially drowned in a stormy ocean with large waves" (this is all done with math)