Exhibit No. 004 · 3D worlds

Minecraft in three.js

The one-shot Minecraft clone that Greg Brockman posted to show off a new coding model.

Prompt

> create a three.js basic working version of minecraft, make your own textures, no sound. add some environment to make it more interesting, like sand, water etc.

What it tests

A bigger project in one go: terrain generation, hand-made textures, first-person movement, collisions, and breaking and placing blocks.

Origin

Greg Brockman · 2025

410K views on the original post

Difficulty

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Results

Verdicts are our own assessment of each answer.

Claude Opus 5.5

Pass

Run on 2026-10-19Open the raw answer

Test conditions

Single attempt per test, no retries and no edits afterwards. Run inside a Claude Code agent session, which includes its own system prompt, rather than the raw API.

All results for Claude Opus 5.5

Run it yourself

Paste the prompt into the model or agent you want to test. Save the answer as a .html file and open it in a browser.

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