Milkyway Andromeda Merger Bench — AI skill for Claude Code

Milky Way–Andromeda collision generation benchmarks

Generated browser simulations and visualizations of a possible collision and merger between the Milky Way and Andromeda. Each top-level project folder is a separate benchmark output, with its own implementation, controls, and generation usage record.

The folder names identify three vanilla model runs. This repository contains their source snapshots and accounting notes; it does not include a shared generation prompt, automated cross-project benchmark runner, or scoring rubric.

Benchmarks

Benchmark	Implementation	Local runtime	Recorded generation cost (USD)
Vanilla Claude Fable 5.1	Restricted N-body simulation; WebGL; 40,000–60,000 test stars; 0–9 Gyr timeline	Static HTTP server	$4.48
Vanilla Claude Opus 5	Restricted N-body encounter with a rigid-disc approach phase; WebGL 2; 56,000–110,000 test stars; 0–8 Gyr timeline	Static HTTP server	$6.93
Vanilla GPT-6 Astra	Artistic galaxy animation with scripted paths; React, TypeScript, WebGL, and Vinext; 0–8 Gyr timeline	Local Node.js server and npm	$5.04

Gyr means billion years. The two restricted N-body models move massless test stars through analytic galaxy potentials. The Astra implementation uses choreographed motion and illustrative distances. These implementation differences matter when comparing the resulting visuals and behavior.

Opus 5	Fable 5.1	GPT-6 Astra
		<img width="1024" alt="Screenshot 2026-09-12 at 10 43 24" src="https://github.com/user-attachments/assets/3