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That doesn't seem to be the case here. Reading through the article and twitter thread, the impression I get is that between moyix and the author, a decent amount of time was spent on this. A valid criticism that could have been made is the use of Claude Sonnet but based on the twitter thread, it looks like opus was what @moyix leveraged.

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Yes – it's a bit hard to follow the various branches of the thread on Twitter (I wasn't really intending this to be more than a 30 minute "hey that's neat" kind of experiment, but people kept suggesting new and interesting things to try :)), but I gave Claude Opus three independent tries at creating a fuzzer for Toby's packet parser, and it consistently missed the fact that it needed to include the sequence number in the CRC calculation.

Once that oversight was pointed out, it did write a decent fuzzer that found the memory safety bugs in do_read and do_write. I also got it to fix those two bugs automatically (by providing it the ASAN output).

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