Claude Code uses Bun written in Rust now

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Honestly, I initially thought rewriting an entire codebase with AI would be a huge mistake. After reading this, I'm starting to think I was wrong.

If projects like Bun can be substantially rewritten and shipped to millions of users, it suggests we're entering a very different phase of software development.

Today's AI-generated rewrites may not produce code that humans would consider high quality or maintainable. But I'm beginning to wonder whether that will even matter in a few months. If AI is the primary consumer, maintainer, and refactorer of code, human readability becomes far less important than correctness, performance, and the ability to iterate.

This feels like a shift where software may no longer exist as a long-lived artifact in its current form. Instead of writing and maintaining applications for years, we may generate, adapt, and discard them continuously for each use case.

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> Startup got 10% faster on Linux but otherwise, barely anyone noticed.

Just that?

I was expecting more from that rewrite. Maybe Rust is not so worth it after all.

Ok, so let me wrap this for everyone:

While everyone here in this forum kept arguing (and fighting and yelling at each other) whether tis moral/right/secure/cheap for ppl to rewrite and ship a major software package with LLMs/agents, one of the main drivers behind AI actually did it, without consulting your opinion, and most same everyone actually slurped this decision without paying a a notice.

Boring is good, but this boring is super massive major thing that happened, and precisely because security is still intact.

I have a better idea: convert it to a prompt and commit the prompt to the repository. Then Mythos will be your compiler.

I've been using Claude Code daily for a fairly large FastAPI project and didn't notice anything unusual around that timeframe. If this really was the Rust runtime underneath, "boring is good" seems like the right outcome.

I'm looking at this situation strictly as 'What's possible today'. If a 1M lines code rewrite from one language to another goes into production in 1 month, that's a very strong signal that the models are now insanely capable.

My anxiety before merging a 2K lines PR is greatly reduced after 3 frontier models (Fable, 5.6 and kimi K3) finds no issues in it.

Just 6 months ago (Opus 4.6) this was not true, a big PR would have countless number of issues.

Aside from the human drama, the message to all of us is - these things are ready for whatever your imagination can throw at them.

I think that's exactly what Anthropic wanted to communicate.

Everyone associated with "Claude" "Rust" or "Bun" is an idiot.

Any time I see any of those words "Kagi" too I immediately ignore whatever they're trying to sell.

Nobody ever believed these people were creative technologists. Anyone who uses any of these buzzwords is a hack.

Real LLMs are ran locally on real computers (not in data centers optimizing for cost).

Real software is written in C++ and JavaScript.

The browser is Chrome, until someone does something better.

I don't make the rules.