> "
Yes--sure--one example of each is proof they can do both tasks."
Therefore LLMs are useful. Q.E.D. The claim "people who say LLMs are useful are deluded" is refuted. Readers can stop here, there is no disagreement to argue about.
> "But I take your GP to be suggesting something more like: this success at plumbing a sink inside the framework an existing house with plumbing provides is proof that these things can (or will) build average fully-plumbed houses."
Not exactly; it's common to see people dismiss internet claims of LLMs being useful. Here[1] is a specific dismissal that I am thinking of where various people are claiming that LLMs are useful and the HN commenter investigated and says the LLMs are useless, the people are incompetent, and others are hand-writing a lot of the code. No data is provided for use the readers to make any judgement one way or the other. Emil taking months to create the Python version could be dismissed this way as well, assuming a lot of hand-writing of code in that time. Small scripts can be dismissed with "I could have written that quickly" or "it's basically regurgitating from StackOverflow".
Simon Willison's experiment is a more concrete example. The task is clearly specified, not vague architecture design. The task has a clear success condition (the tests). It's clear how big the task is and it's not a tiny trivial toy. It's clear how long the whole project took and how long GPT ran for, there isn't a lot of human work hiding in it. It ran for multiple hours generating a non-trivial amount of work/code which is not likely to be a literal example regurgitated from its training data. The author is known (Django, Datasette) to be a competent programmer. The LLM code can be clearly separated from any human involvement.
Where my GP was going is that the experiment is not just another vague anecdote, it's specific enough that there's no room left for dismissing it how the commenter in [1] does. It's untenable to hold the view that "LLMs are useless" in light of this example.
> (repeat) "But I take your GP to be suggesting something more like: this success at plumbing a sink inside the framework an existing house with plumbing provides is proof that these things can (or will) build average fully-plumbed houses."
The example is not proof that these things can do anything else, but why would you assume they can't do tasks of similar complexity? Through time we've gone from "LLMs don't exist" to "LLMs exist as novelties and toys (GPT-1 2018)" to "LLMs might be useful but might not be". If things keep progressing we will get to "LLMs are useful". I am taking the position that we are past that point, and I am arguing that position. We are definitely into the time "they are useful". Other people have believed that for a long time. Not just useful for that task, but for tasks of that kind of complexity.
Sometime between GPT-1 babbling (2018) and today (Q4 2025) the GPTs and the tooling improved from not being able to do this task to yes being able to do this task. Some refinement, some chain of thought, some enlarged context, some API features, some CLI tools.
Since one can't argue that LLMs are useless by giving a single example of a failure, to hold the view that LLMs are useless, one would need to broadly dismiss whole classes of examples by the techniques in [1]. This specific example can't be dismissed in those ways.
> "If the success doesn't generalize to less favorable situations that do pay the bills"
Most bill-paying code in the world is CRUD, web front end, business logic, not intricate parsing and computer science fundamentals. I'm expecting that "AI slop" is going to be good enough for managers no matter how objectionable programmers find it. If I order something online and it arrives, I don't care if the order form was Ruby on Rails emailing someone who copied the order docs into a Google Spreadsheet using an AI generated If This Then That workflow. and as long as the error rate and credit card chargeback rate are low enough, nor will the company owners. Even though there are tons of examples of companies having very poor systems and still being in business, I don't have any specific examples so I wouldn't argue this vehemently - but the world isn't waiting for LLMs to be as 'useful' as HN commenters are waiting for, before throwing spaghetti at the wall and letting 'Darwinian Natural Selection' find the maximum level of slop the markets will tolerate.
----
On that note, a pedantic bit about cherry-picking: there's a difference between cherry-picking as a thing, and cherry-picking as a logical fallacy / bad-faith argument. e.g. if someone claims "Plants are inedible" and I point to cabbage and say it proves the claim is false, you say I'm cherry-picking cabbage and ignoring poisonous foxgloves. However, foxgloves existing - and a thousand other inedible plants existing - does not make edible cabbage stop existing. Seeing the ignored examples does not change the conclusion "plants are inedible" is false, so ignoring those things was not bad. Similarly "I asked GPT5 to port the Linux kernel to Rust and it failed" does not invalidate the html5 parser port.
Definition 2 is bad form; e.g. saying "smoking is good for you, here is a study which proves it" is a cherry-picking fallacy because if the ignored-studies were seen, they would counter the claim "smoking is good for you". Hiding them is part of the argument, deceptively.
"LLMs are useless and only a deluded person would say otherwise" is an example of the former; it's countered by a single example of a non-deluded person showing an LLM doing something useful. It isn't a cherry-picking fallacy to pick one example because no amount of "I asked ChatGPT to port Linux to Rust and it failed" makes the HTML parser stop existing and doesn't change the conclusion.
[1] https://news.ycombinator.com/item?id=45560885