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Bun

A fast all-in-one JavaScript runtime.

Open-source all-in-one JavaScript runtime and toolkit for running, bundling, testing, and packaging JavaScript and TypeScript applications.

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workflowPRIMARY2026-07-08

Bun Rust rewrite becomes AI-assisted coding case study with estimated $165k API cost

Simon Willison highlighted Jarred Sumner’s Bun rewrite from Zig to Rust as an AI-assisted workflow using trial runs, dynamic planning, adversarial review, and verification. One estimate put API token cost near $165k.