Bun Rewrites Runtime In Rust Using $165K Claude AI Tokens

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Bun Rewrites Runtime In Rust Using $165K Claude AI Tokens

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DB David Bau@davidbau

4:22 AM · Jul 18, 2026

499TECH

All computer science is embroiled in a debate: Can you write good code without reading it? E.g., Jarred Sumner is betting the next version of bun that $165,000 of Claude Fable tokens can do it for you, as long as if you test enough.

Jarred Sumner@jarredsumner

Rewriting Bun in Rust https://bun.com/blog/bun-in-rust

DB David Bau@davidbau

4:22 AM · Jul 18, 2026

499TECH

On the other hand, Zig author Andrew Kelley asks how Jarred's tests could possibly be "sufficient to catch bugs in 1 million lines of unreviewed slop." I think a lot of us are wondering about this in a lot of AI code.

Lewis Campbell@LewisCTech

Based Andrew Kelley. Zig VS Rust is irrelevant here. I will always support real engineering with real thought behind it, over slop produced by tired computer programmers - no matter how technologically impressive the slop machine is.

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Users find the different approaches taken by AI agents super interesting and instructive in the context of Bun rewriting its runtime in Rust with $165K of Claude tokens.

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DB David Bau@davidbau

4:22 AM · Jul 18, 2026

The different approaches taken by different agents at http://mazesofmenace.ai is super interesting. And reading the difference between agents' different approaches is really instructive. I have written a blog post all about it here: https://twitter.com/19357631/status/2078438509720047725

DB David Bau@davidbau

4:22 AM · Jul 18, 2026

499TECH

DB David Bau@davidbau

4:22 AM · Jul 18, 2026

499TECH

1 saves

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Positive Read

Users find the different approaches taken by AI agents super interesting and instructive in the context of Bun rewriting its runtime in Rust with $165K of Claude tokens.

Based on 1 visible X reactions from 1 accounts; directional sample.

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