bun - Tech blog

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bun

A collection of 2 posts

Bun (rust) vs Zig: Who Gets It Right, According to AI

Bun (rust) vs Zig: Who Gets It Right, According to AI

The Bun Zig-to-Rust Rewrite: Jarred Sumner vs Andrew Kelley In May 2026, Jarred Sumner rewrote Bun from Zig to Rust in 11 days. He used 64 Claude Fable 5 agents running in parallel through Claude Code. The cost was about $165,000 at API pricing. Bun was 535,496 lines

Bun 1.4: The controversial AI-Driven Rewrite from Zig to Rust

Bun 1.4: The controversial AI-Driven Rewrite from Zig to Rust

In May 2026, the Bun team did something the software industry has been whispering about for years: they rewrote their entire runtime from Zig to Rust. Not over the course of a year with a dedicated team. In six days. Using AI agents. At nearly a million lines of code,