World Labs, the startup founded by AI pioneer Fei-Fei Li, is launching its first commercial world model product. Marble is now available via freemium and paid tiers that let users turn text prompts, photos, videos, 3D layouts or panoramas into editable, downloadable 3D environments. The launch of the generative world model, first released in limited beta preview two months ago, comes a little over a year after World Labs came out of stealth with $230 million in funding, and puts the startup ahea...