WorldBench

Overview

WorldBench asks one question: can a model build a world that holds together?

Every model gets the same natural-language prompt, ~3,000 tokens, and has to return a single self-contained world.html that renders a floating, multi-biome voxel island in Three.js. No image, no schema, no reference file, no build step. It has to open in a browser and run.

It is a human-as-judge benchmark. No rubric, no automated scorer, because there is no single correct island: only a hand-tuned reference built by a human, and your own eyes to compare it against a range of very different automated attempts.

Why It Is Hard

The island is the visible part. What the prompt actually demands is that several kinds of reasoning hold at the same time:

• Spatial and relational placement: the prompt encodes a placement graph, not a list. The model has to satisfy the whole adjacency structure, not place ten biomes wherever they fit.
• Ecological causality: water has to behave like water. Mountain melt feeds a wet corridor. The desert is a rain-shadow basin with no through-river. Lava touching water quenches to obsidian. It is a small causal system to simulate, not decorate.
• Elevation and scale: peaks dominate, shelves sit mid-height, plains stay low, and every biome still has to read as its own region from a high orbit instead of collapsing into its neighbor.
• Ecological grounding: cacti in the desert, pines in the snow forest, deer at jungle edges. Placing life that matches its climate.
• Temporal systems: a day/night cycle, a seasonal cycle, and cyclic weather that stays staggered by biome instead of blanketing the island at once.
• Interaction logic: a clickable legend that flies the camera to each region, wiring 3D scene state to on-screen UI.

All of it in one file, first try.

The Placement Graph

The ecology is a typed graph rather than prose. One perennial water corridor runs the length of it, and the edges that break that line carry the difficulty.

The flowering grove has two valid sources, down the highland slope and/or across from the grassland plateau, which gives the graph its one real cycle. The desert touches the grassland only through dry washes that fade out before they arrive: a genuine relation, but never a through-river. The backwater swamp hangs off the jungle's wet side as a dead end. The volcano sits off the water system entirely, reached by a single causal rule.

Holding that adjacency structure while laying out geometry is the benchmark.

Results

A growing roster, currently spanning Claude, GPT, Gemini, Grok, Kimi, GLM and Qwen, with new models added as they ship.

Worlds render live and interactive on the site, and up to six can be compared side by side.

What's Next

Judgement today is human and whole-island: you look at it and decide whether it holds together. That resolves the question at only one level of detail.

Next is to go finer, either an LLM-as-judge or a per-component breakdown scoring logical alignment, rendering, flora and fauna and placement graph separately, so a world can be strong in one and weak in another instead of collapsing to a single impression. Making those scores mean anything takes heavy iteration, so it is near-future rather than now.

Try It

Browse the results at worldbench.krishb.tech, or run it without the site: copy the prompt, paste it into any model, save the raw output as world.html, and open it in your browser.