> Couldn’t tell.

I can tell. It's night and day.

Last year I used a bunch of models to try to generate Rust code. They all sucked.

This February I tried again and used Claude to generate Rust code. I have never been more stunned in my life. It's just as good as I am, and 30x faster. No fluff, the code is verbatim just as I would have written.

I then tried other models. Total disappointment.

I've continued to repeat this experiment. Opus is the only model that can write Rust reasonably.

Codex produces junk to this day. It passes variables that aren't needed, it abuses pointers, it creates overly verbose monstrosities...

I don't want any single company to win. I want OpenAI to be competitive. I want open source models to win. But right now, Claude Code and Opus are it.

I recently tried with C# code and Avalonia on Linux. Total disaster. Could only get things to run after 10 attempts or so, and was only trying a very basic example. For some of the experiments I actually gave up.