Rewriting Bun in Rust
The creator of the Bun runtime has announced a transition from Zig to Rust to improve stability and prevent recurring bugs. This decision follows Bun's acquisition by Anthropic and the integration of AI-assisted coding tools.
Why it matters
Highlights the technical challenges of maintaining high-performance software and the evolving role of LLMs in large-scale code refactoring.
Disclosure: Bun was acquired by Anthropic in December 2025. I and others on the Bun team work at Anthropic. I used a pre-release version of Claude Fable 5 for much of the Rust rewrite.
The article is a technical post-mortem regarding software engineering decisions and language choice.
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