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Bun creator says he rewrote Bun from Zig

Bun creator says he rewrote Bun from Zig to Rust using a pre-release version of Claude Fable 5 in 11 days; the task would've taken three engineers about a year

Disclosure: Bun was acquired by Anthropic in December 2025. I and others on the Bun team work at Anthropic.

Source: bun.com · Opens in new tab