Simon Willison recorded a phone demo of his Equal Earth animation and needed an optimized MP4 for his blog. Instead of reaching for a native tool or a SaaS video compressor, he did what any AI-native developer would: he asked Claude Fable 5.1 (via Claude Code) to build him exactly what he needed.
Simon Willison Vibe-Coded a Browser-Based FFMPEG Video Compressor in One Session
Simon Willison used Claude Fable 5.1 in Claude Code to build a fully functional, client-side video compression tool — powered by FFMPEG running in WebAssembly — in a single session. Here's why that matters.
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