Anthropic runs large-scale code migrations with Claude Code
1–10 of 36 posts
Re: Anthropic runs large-scale code migrations with Claude Code
#2[flagged]
Re: Anthropic runs large-scale code migrations with Claude Code
#3> Jarred Sumner, co-founder of Bun and Member of Technical Staff at Anthropic, used Claude Code to migrate Bun from Zig to Rust. A million lines of code were produced in less than two weeks, with 100% of Bun's existing test suite passing in CI before merge. Nineteen regressions surfaced after merge and have all been fixed.
I couldn't come up with a clearer example of how this kind of stuff fails to apply to my work. If I shipped nineteen regressions in 2 weeks, my company would be desperately apologizing to our customers, not writing a blog post about what a great job I did.
Re: Anthropic runs large-scale code migrations with Claude Code
#4> Jarred Sumner, co-founder of Bun and Member of Technical Staff at Anthropic, used Claude Code to migrate Bun from Zig to Rust. A million lines of code were produced in less than two weeks, with 100% of Bun's existing test suite passing in CI before merge. Nineteen regressions surfaced after merge and have all been fixed. I couldn't come up with a clearer example of how this kind of stuff fails to apply to my work.…
I guess even anthropic fails to not get slop from ai ..
Re: Anthropic runs large-scale code migrations with Claude Code
#5So, the whole brouhaha was so that Anthropic can write this blog post?
Re: Anthropic runs large-scale code migrations with Claude Code
#6> Jarred Sumner, co-founder of Bun and Member of Technical Staff at Anthropic, used Claude Code to migrate Bun from Zig to Rust. A million lines of code were produced in less than two weeks, with 100% of Bun's existing test suite passing in CI before merge. Nineteen regressions surfaced after merge and have all been fixed. I couldn't come up with a clearer example of how this kind of stuff fails to apply to my work.…
Regressions is a meaningless metric to me. Every app has bugs, and most are either rarely encountered or aren't breaking the app. All I care about is interruption of service.
Re: Anthropic runs large-scale code migrations with Claude Code
#7So, the whole brouhaha was so that Anthropic can write this blog post?
> So, the whole brouhaha was so that Anthropic can write this blog post?
Remember mythos ? I was half-expecting them to scare us with a new danger: How AI can covert code into other languages, and confuse the hell out of all of us.
Re: Anthropic runs large-scale code migrations with Claude Code
#8> Jarred Sumner, co-founder of Bun and Member of Technical Staff at Anthropic, used Claude Code to migrate Bun from Zig to Rust. A million lines of code were produced in less than two weeks, with 100% of Bun's existing test suite passing in CI before merge. Nineteen regressions surfaced after merge and have all been fixed. I couldn't come up with a clearer example of how this kind of stuff fails to apply to my work.…
Umm yeah because you didn't rewrite a million line codebase in Rust in two weeks.
Obviously "regressions" is not a great measure (how serious were they?) but 19 seems pretty decent to me.
Re: Anthropic runs large-scale code migrations with Claude Code
#9> Jarred Sumner, co-founder of Bun and Member of Technical Staff at Anthropic, used Claude Code to migrate Bun from Zig to Rust. A million lines of code were produced in less than two weeks, with 100% of Bun's existing test suite passing in CI before merge. Nineteen regressions surfaced after merge and have all been fixed. I couldn't come up with a clearer example of how this kind of stuff fails to apply to my work.…
They didn't ship 19 regressions over 2 weeks. "Merged" doesn't mean "shipped". Their customers have probably seen none of those because they've all been fixed.
Such a terribly bad faith take. I feel upset reading this more than I should have.
Re: Anthropic runs large-scale code migrations with Claude Code
#10> Jarred Sumner, co-founder of Bun and Member of Technical Staff at Anthropic, used Claude Code to migrate Bun from Zig to Rust. A million lines of code were produced in less than two weeks, with 100% of Bun's existing test suite passing in CI before merge. Nineteen regressions surfaced after merge and have all been fixed. I couldn't come up with a clearer example of how this kind of stuff fails to apply to my work.…
Migrating a million lines of code is how many human-engineer-years worth of work? Some quick fermi estimates place it at between 15-100 years depending on how much automated tooling is used (without AI).
It really blows my mind how some AI naysayers like you fail the absolute basic common sense test of comparing the comparable. If you, without AI, merged nineteen regressions in 2 weeks, how much work has actually been done? How many features did you rewrite? How many refactors did you make and how difficult were they?
Insane...