# The most controversial rewrite in history just shipped...

**Published:** October 14, 2026
**Author:** Fireship
**Source:** YouTube — Fireship AI
**Language:** en-US
**HTML:** https://aiqazaqstan.com/en/articles/the-most-controversial-rewrite-in-history-just-shipped

Last week, Bun, the all-in-one JavaScript toolkit that was acquired by Anthropic late last year, announced that they spent the equivalent of $165,000 running 64 parallel Cloud agents to refactor their entire codebase from Zig to Rust in just 11 days. Usually, a full rewrite to…

> From the original source: **YouTube — Fireship AI**
> [Read full article at YouTube — Fireship AI](https://www.youtube.com/watch?v=CXSvKcLovAk)

**Tags:** #Anthropic #Microsoft #YouTube

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