GPT-5.6 PRO JUST GENERATED A COMPLETE 3D HOUSE INSIDE A SINGLE HTML FILE IN 30 MINUTES. No engine. No build pipeline. Pure WebGL2 in one file you open directly in a browser. The structure is coherent. The volumes are credible. It's fully navigable, walk through it like any 3D scene. Still a few inconsistencies, mostly around the windows, but at the rate this is improving, that specific class of flaw won't last long.(CyrilXBT)