I'm still not sure. Would love thoguhts on this.. but in this new ai world we are in... is it better to go fullstack typescript? or go with proven mature frameworks? .net, ruby, django, etc? Seems TS is moving fast but maybe its time to not reach for the shiny object and stick with proven tech? or in 5 years will we regret it?
If AI writes your code, why use Python?
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Re: If AI writes your code, why use Python?
#52The ideal language for AI coding: 1. Type safety as basic guard rails that LLM output is syntactically and schematically correct 2. Concise since you have to review a lot more code 3. Easy to debug / good observability since you can't rely on your understanding of the code. Something functional where you can observe the state at any moment would be ideal. 4. A very large set of public code examples across various dom…
This is just Kotlin. Strongly typed, more concise than Java or Go (and probably Typescript), less likely to blow up at runtime than Typescript, epic tooling, plenty of public code, and a library for basically anything because JVM.
And needs the JVM to start for 1.5s before you get any results. Sure.
Golang or just shell scripts.
Re: If AI writes your code, why use Python?
#53One thing to consider:
The (well-known) Sapir–Whorf hypothesis (if dont know it, look it uop) is often invoked for natural languages, but there’s a pretty direct analogue for programming languages: the language you "think in" during solving a problem biases which abstractions and idioms you reach for first.
If you force an LLM to first solve a problem in a highly abstract language (Lisp, APL, Prolog) and only then later translate that solution to C++ or Rust, you’re effectively changing the intermediate representation the model works in. That IR has very different "affordance", e.g.
- Lisp pushes you toward recursive tree/list processing, higher‑order functions and macro‑like decomposition. (some nice web frameworks were initially written in LISP, scheme, etc...)
- APL pushes you toward whole‑array transforms, point‑free pipelines and exploiting data parallelism. (banks are still using it because of perforance)
- Prolog pushes you toward facts/rules, constraint satisfaction, and backtracking search. (it is a very high abstraction but might suit LLMs very well)
OK, and when you then translate that program into C++/Rust/python, a lot of this bias leaks through. You often end up with:
Rule engines, constraint solvers, or table‑driven dispatch code when the starting point was Prolog.
Iterator/functor pipelines and EDSL‑like combinators when the starting point was Lisp.
Data‑parallel kernels and "vectorized" loops when the starting point was APL.
In principle, an LLM could generate those idioms directly in C++/Rust. In practice, however, models are heavily shaped by their training distribution and default prompts. If you just say "write in Rust", they tend to regress towards the most common patterns in the corpus (framework‑heavy, imperative, not very aggressively functional or data‑parallel), even when the language would support richer abstractions.
By inserting a "thinking" step in a different paradigm, you bias the search over solution space before you ever get to Rust/C++. That doesn’t magically make the code better, but it does change which regions of the design space the model explores.
Same would also be true for python which is already a multi-idiomatic language. So it might be a good idea to learn a portfolio of different languages and then try to tackle a problem with a specific language instead of automatically using python/go/rust because of performance.
Something to consider...
p.s. how would a problem be solved when the LLM would have to write it first in erlang? Is it the automatically distributed?
p.p.s. the "design pattern" of the GoF comes automatically to my mind, which might be a good hint to the LLM to use.
Re: If AI writes your code, why use Python?
#54I'm still not sure. Would love thoguhts on this.. but in this new ai world we are in... is it better to go fullstack typescript? or go with proven mature frameworks? .net, ruby, django, etc? Seems TS is moving fast but maybe its time to not reach for the shiny object and stick with proven tech? or in 5 years will we regret it?
The main risk-of-regret is: How will you feel when/if the $20/month plan costs $2000/month?
May never happen. But be clear with yourself if you’re relying on it not happening.
It’s a hell of a nice risk mitigator to understand the code, in a language you know, if you have to print-debug it yourself at some point.
Re: If AI writes your code, why use Python?
#55Earlier quoted context omitted.
Problem with Python and other non-strict typed languages is that if you let an LLM to write some stuff, you cannot truly be confident that nothing has broken. Even if your tests all pass. The LLM could have broken some path that only gets run in production in a very specific case. At least with strongly-typed languages you get a compiler error. In big codebases is non-negotiable
so it just boils down to strictness even when we're talking LLMs? I agree with you about fast failure being a nice feature , but I also think that if you're TDDing a bunch of stuff and it fails in some categorical way , well then the test suite was lazy.
> so it just boils down to strictness even when we're talking LLMs?
The article describes what I've been doing for the past few months - I did small python projects in the past because of the ecosystem: I couldn't possibly write a ton of the stuff required for the things I wanted to do, so I leaned into python because someone already wrote it for me. Quality of deps was mostly ok for the happy paths, but always a chore to patch the broken ones.
Nowadays I tell Claude what I want to build and I always ask it whether rust is a good choice for it. It'll pick up the right crates or choose whether it should DIY, do all the plumbing, nail all the logic, and in ~30m I'll have something very solid that would have taken me 3+ weeks of part-time evening coding in python. I think the article is right and rust is the closest to the "best language" we have for LLM coding at the moment: the strict typing and the tooling dramatically reduce the output space for LLMs, and 99% of errors have a clear, precise explanation that is actionable, and the compiler helps you a lot there too.
I think it also boils down to the fact that you cannot reliably and quickly answer "why is this arg None?" in languages like python without figuring out the call graph and evaluating possible states and inputs/outputs. Rust makes all that explicit and forces you handle it, which I feel dramatically cuts the time an LLM needs to spend figuring out why it's broken or what to do next. EDIT: The fact that you get memory safety on top of all this and it's handled by the compiler is yet another advantage for LLMs: the logic that gets written is simpler to reason about, because if you try to mutably access the same variable in two different places, the compiler will feed this back to the LLM at build time. In other languages that would be a "code smell" or would require static analysis.
Strictness is a quality for software and a chore for humans, and of course the stricter you are at representing your logic and your state machine, the less ways a program can break. LLMs writing in rust give you the strictness without the chore part, and it's a very good deal from my point of view.
Re: If AI writes your code, why use Python?
#56Let's go through some of the arguments, in no particular order:
> Klabnik vibe-coded a new language in Rust, therefore Claude + Rust = Good.
I argue the inverse -- Rust, being an ML-family language, is well suited for parsing, and language design (I know! Shocker!). In more moderate translation -- ML-style languages are good for parsing, interpreting and compiling code. Claude is not the magic here -- ML is.
I would also add that I've had decent success vibe-coding+human-coding Haskell (contrary to the article). My experience is that if I can hand-write a rich set of types (blessed be IxMonad), I can throw Claude to fill in the blanks for the implementations. If I can design the data structures that make the program tick, bridging them is something Claude is awesome at. Again, no surprise -- it's intern-level work.
The key distinction between C, Zig and Rust is that Rust is designed around types. C and Zig are more memory-oriented -- they really see most of your program as flat memory and you can kind of shoehorn a little bit of data layout in that flat memory. While this offers a large amount flexibility, this philosophy isn't well suited for proving out correctness. But again -- this doesn't mean they don't have a spot.
When I was a junior at Tesla, I used to joke that senior staff had a VMs in their heads, because that's really how you analyze C programs -- you try to execute it in your head, with interesting inputs, but that's about it. Claude's head-VM is quite fuzzy and often makes errors.
With Rust, if you design your type system, you prevent yourself from making dumb mistakes. Swap out "yourself" with Claude here and it's the same story.
I've yet to see Claude design really nice type systems, fwiw.
But the point is -- Claude is the enemy of beauty and correctness -- it's up to the SWE to design a type-system which will prevent it from doing so. To be clear, I obsess over type-systems personally, but that's not the only way -- incredibly rich, comprehensive, huge type systems, fuzzing, Antithesis, proptesting are all things you can do to minimize the impact of slop, and those are all valid things to do.
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> Code is not written by humans therefore it doesn't matter that you don't know Rust.
Wouldn't say this was explicitly stated, but I definitely smelt this undertone throughout the article. If you don't understand the language you're reading, how can you understand whether the code in front of you is correct or not? If you have a systems engineer sitting across you to clean your PRs up, you can pass that responsibility onto them, but what about when they give their two weeks?
If all you know is Python, chances are you're going to make better software in Python than in Rust. Stick an `Arc>` everywhere and chances are your code will be slower, as a matter of fact. Use If you want to learn Rust, please join us! But if all you're trying to do is vibe-code better code -- do it in the language you know and can actually debug when shit hits the fan.
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> Anthropic C Compiler
It is impressive that Claude is awesome at taking existing code and rewriting it, this is certain, but I'd like to repeat the exact same rhetoric that many have given -- rewriting =/= original authorship. Awesome, we have a C compiler, but we already had one, and we just rewrote it? Seems like a little bit of wasted electricity.
To build on top of this, I am really happy that Bun is exploring Rust, and the Claude rewrite is truly impressive, but quite surprising at times, preserving strange anti-patterns (my name being said anti-pattern, teehee): https://github.com/oven-sh/bun/blob/ffa6ce211a0267161ae48b82.... It's hard to determine why Claude decided this -- I assume a really strict input prompt.
Do note that the current stage of that PR is much better than what it was at the state of that commit, and obviously Jarred isn't merging blind slop, but that is still human-driven by someone who has an understanding of their product.
My bet is actually that _rewrites_ of already-functioning, well-tested code, are likely to be more common as time progresses. I think that's what Claude is really awesome at, and I think Claude can often achieve 80-20 improvements through rewrites. Again, Claude alone will not be a silver bullet -- it won't generate data-oriented programs if the source material wasn't data-oriented. It won't optimize for cache coherency, if the source didn't, but moving from Python to Rust alone, with more-or-less the same code structure, you're likely to see improvements by virtue of common operations being memory-coherent and avoiding the GIL and so on.
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> A C compiler written in Rust used to be a graduate thesis. It isn’t anymore.
Come on, this is disingenuous -- a simple C compiler is a 1-day long project. LLVM is a graduate thesis (and for good reason). Copy-pasting prior-art is academic dishonesty and Claude does a lot of that.
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For transparency: I work with Noah.
EDIT: Wanted to add that not a single line of my comment was AI generated.
Re: If AI writes your code, why use Python?
#57The ideal language for AI coding: 1. Type safety as basic guard rails that LLM output is syntactically and schematically correct 2. Concise since you have to review a lot more code 3. Easy to debug / good observability since you can't rely on your understanding of the code. Something functional where you can observe the state at any moment would be ideal. 4. A very large set of public code examples across various dom…
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Re: If AI writes your code, why use Python?
#58Python has a much more mature ecosystem than Rust, especially for AI/ML stuff. I ran into a rust crate that purported to do a certain ML algorithm but did not do it correctly. I managed to write a replacement with Claude though. I do think enforcing correctness at the type system level is a good idea for AI, which is why I often choose languages like C# and Rust over Python. However, for some things Python is definit…
I almost always pick Rust. Recently I wrote a plugin for something that was written in Go. I could have used Rust, but Go for one felt right because if the thing turned out well, others would surely find more value in having one toolchain.
The main reason is that you’re capable of reading it if you need to. And the recipient ecosystem expects a language. That’s why some data science communities pick R, MatLab, Julia, Python or Mojo not depending on what’s superior tech, but what their peers speak.
Re: If AI writes your code, why use Python?
#59Many here propose replacing Python with more performant, but less familiar languages - mostly Rust, Go. But I find the argument that the AI - HUMAN interface is the most important. A simple version of this is “no, stick with Python if that’s what you know”. A more interesting version is “use this new found AI leeway to move up the abstraction level”, “try something more expressive and human oriented”, “make a DSL and parser that suits the domain (and focuses the AI)”. Despite being a minority language, Raku is ideal for these aspects (esp with built in Grammars and general kitchen sink repartee) and works surprisingly well with most popular LLMs.
Re: If AI writes your code, why use Python?
#60Earlier quoted context omitted.
This is just Kotlin. Strongly typed, more concise than Java or Go (and probably Typescript), less likely to blow up at runtime than Typescript, epic tooling, plenty of public code, and a library for basically anything because JVM.
And needs the JVM to start for 1.5s before you get any results. Sure. Golang or just shell scripts.
The JVM takes tens of milliseconds to boot up, not a second and a half.