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Can Claude Sonnet 4 write x86 assembly? I ran an experiment today and got Claude plus Claude Code to build, run and debug a pleasing Mandelbrot fractal in assembly, compiled via Docker on my Mac Full details, including prompts and Claude Code transcript, here: simonwillison.net/2025/Jul/2/m...

2/7/25, 4:42 am12 reposts131 likes

Anthony Shaw

@anthonypjshaw.bsky.social

2 July 2025

3.7 wrote a machine-code compiled language for me, so I'd expect 4 to handle x86 well. Although I'd expect it get stuck in loops for repetitive assembly blocks (of which there are many). There's a recording of this being made live on the README github.com/tonybaloney/...

github.comGitHub - tonybaloney/vibe-programming-languageContribute to tonybaloney/vibe-programming-language development by creating an account on GitHub.

Peter Van Dijck

@petervandijck.bsky.social

2 July 2025

Next up, assembly for the Commodore 64 STA

György Kiss

@kissgyorgy.me

2 July 2025

I feel 10x productive with Claude Code, but you are doing next level crazy shit with it 😀

neuromute

@neuromute.ai

2 July 2025

A family member was having trouble getting Claude to write assembly inlined in C, took more than a few retries. Was this a one shot?

Simon Willison

@simonwillison.net

2 July 2025

I shared my exact prompt sequence - not quite one shot but close The key is having a tool like Claude Code that can run the compiler in a loop and fix its own errors

Ivan Karabadzhak

@jakeroid.bsky.social

2 July 2025

That’s interesting approach.