Fable AI One-Shots Rust Rewrite of Python Library, Boosting Render Speed 9.6x

surmenok · x · 2026-08-10

DHH shared a real-world test of the AI coding tool Fable, which one-shotted a Rust rewrite of the TerminalTextEffects Python library using 11 million tokens.

The results are impressive: startup time dropped from 87ms to 2ms, rendering speed increased by 9.6x, and the final output is a 3MB single executable with zero dependencies.

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