Newton's Cradle Playground

A benchmarking playground comparing how 13 AI models build a functional Newton's cradle.

Newtons Cradle clonePlayable

Description

This simulation playground benchmarks 13 frontier AI models—including Claude Opus 5.5, GPT-6 Luna, and Gemini 4 Argon—on their ability to generate a functional Newton's cradle in a single HTML file. The playground evaluates each model's output based on physical realism, clean momentum transfer, and energy damping through interactive side-by-side demos.

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Details

Why this is interesting: A standout benchmarking playground that rigorously compares 13 frontier models on a single physics-coding task.
Attributed to: @elliscrosby
Built with: GPT-6.1 Sol
Links: springprompt.com
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Tags: #simulation #physics #benchmark #physics-engine

Discovered: X
First posted: X · Oct 11, 2026
Listed: Added 4d ago
Build: Strong
Models: Strong

Prompt

Make a Newton's cradle with five balls. Drag a ball (or several) out to the side and let go; the swing should pass through the line of balls realistically, losing a little energy each time until it comes to rest.

Make it a single self-contained HTML file (inline CSS and JavaScript, no external libraries, fonts or images).

Source