A Builder Used GPT-6 Astra to Generate a Real-Time Coastal Simulation in Three.js

One of the first public Astra demos shows the benign end of the same capability that triggered OpenAI's cyber gate — autonomous, working code for a live physics simulation.

Within days of Astra's release, builders started shipping demos. A Japanese developer, @hajimetwi3, used a local ChatGPT Work configuration running a GPT-6 Astra Ultra tier to build a real-time coastal simulation in Three.js — the browser-based 3D graphics library — and posted the result.

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