Since people were asking, here's GPT-6 Astra, highest setting: "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"
https://twigl.app?ol=true&ss=-P0ePejFIYPf55anBnZ6
The drowned neo-gothic tower twigl shader created by Fable 5.1 with the same prompt. (compare to Fable 5 in the quoted tweet, and other models before that)