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Not to take away from your experience but to offer a counterpoint.
I used claude code to port rust pdb parsing library to typescript.
My SumatraPDF is a large C++ app and I wanted visibility into where does the size of functions / data go, layout of classes. So I wanted to build a tool to dump info out of a PDB. But I have been diagnosed with extreme case of Rustophobiatis so I just can't touch rust code. Hence, the port to typescript.
With my assistance it did the work in an afternoon and did it well. The code worked. I ran it against large PDB from SumatraPDF and it matched the output of other tools.
In a way porting from one language to another is extreme case of refactoring and Claude did it very well.
I think that in general (your experience notwithstanding) Claude Caude is excellent at refactorings.
Here are 3 refactorings from SumatraPDF where I asked claude code to simplify code written by a human:
https://github.com/sumatrapdfreader/sumatrapdf/commit/a472d3...
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SaaSHub
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That's a silly bar to ask for.
Chrome took at least a thousand man years i.e. 100 people working for 10 years.
I'm lowballing here: it's likely way, way more.
If ai gives 10x speedup, to reproduce Chrome as it is today would require 1 person working for 100 years, 10 people working for 10 years or 100 people working for 1 year.
Clearly, unrealistic bar to meet.
If you want a concrete example: https://github.com/antirez/flux2.c
Creator of Redis started this project 3 weeks ago and use Claude Code to vibe code this.
It works, it's fast and the code quality is as high as I've ever seen a C code base. Easily 1% percentile of quality.
Look at this one-shotted working implementation of jpeg decoder: https://github.com/antirez/flux2.c/commit/a14b0ff5c3b74c7660...
Now, it takes a skilled person to guide Claude Code to generate this but I have zero doubts that this was done at least 5x-10x faster than Antirez writing the same code by hand.
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Thanks a lot, after today I have fully switched to Codex I think.
This vscode extension makes it almost as easy to point codex to something as when doing it in cursor:
https://github.com/suzukenz/vscode-copy-selection-with-line-...