Is it baby AGI? The "Claude Next" prompt on the models you can use today
A viral clip shows a secret Claude checkpoint building a whole Japanese voxel sandbox world, dolphin included, from one short prompt. We gave almost the same prompt to Claude Fable 5.1, Claude Opus 5.5 and GLM 5.3 Flash, then a VoxelBench-style sky-islands scene. One request per build. Cards that needed a fix say so. Everything runs in your browser.
KAZE BLOCKS: a voxel sandbox, Japanese theme
The tiny prompt behind the viral "Claude Next" clip, almost word for word, plus a demo autopilot (key G) so it can play itself.
No fixes. Textured blocks, cherry trees, bamboo, a shrine with a torii gate, lanterns, falling petals, block names in English and Japanese. The generator has water, but this world never dips below sea level.
No fixes. The fastest and cheapest Claude: a torii, cherry trees and a little house, but flat colours, no textures, and an autopilot that walks into walls.
Fixed (one line): a variable name with a space in it stopped the script. Then: a bilingual welcome screen, textured world, a stone path to a torii, lanterns, petals in the wind, and the only one with sound (synthesised wind, a click for every block). One cent.
Floating sky islands at golden hour
A VoxelBench-style build: five islands, a village, a waterfall into the clouds, a windmill, a balloon, rope bridges, and a night button.
No fixes. Clean and detailed; at night every window and lantern lights up.
No fixes. Simpler, but everything is there: windmill, balloon, waterfall, birds.
Fixed (one line): a line the model itself called a no-op threw an error and stopped the scene. Then: named its world, smoke from the chimneys, a night mode called Nightfall.
Time and cost per build
One request each through OpenRouter, reasoning effort low. Cost as billed by OpenRouter.
| Model | Build | Time | Cost | Fixes |
|---|---|---|---|---|
| Claude Fable 5.1 | KAZE BLOCKS: a voxel sandbox, Japanese theme | 4.8 min | $1.331 | - |
| Claude Opus 5.5 | KAZE BLOCKS: a voxel sandbox, Japanese theme | 1.1 min | $0.173 | - |
| GLM 5.3 Flash | KAZE BLOCKS: a voxel sandbox, Japanese theme | 3.2 min | $0.011 | 1 |
| Claude Fable 5.1 | Floating sky islands at golden hour | 3.6 min | $1.005 | - |
| Claude Opus 5.5 | Floating sky islands at golden hour | 1.6 min | $0.224 | - |
| GLM 5.3 Flash | Floating sky islands at golden hour | 7.8 min | $0.025 | 1 |
The exact prompts are for Ruocco Academy members. The Academy is not open yet: join the waiting list and you get one email when it opens. The demos on this page are free to use for everyone.
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