News for hackers. Stuff that matters.
Re:Two things LLM coding agents are still bad at by ivape on Thursday October 09, 2025 @03:12AM (#45524512)
You’re just not using LLMs enough. You can never trust the LLM to generate a url, and this was known over two years ago. It takes one token hallucination to fuck up a url.

It’s very good at a fuzzy great answer, not a precise one. You have to really use this thing all the time and pick up on stuff like that.

Re:Two things LLM coding agents are still bad at by hansmayer on Thursday October 09, 2025 @03:46AM (#45524745)
Yeah so, the reason people use various tools and machines in the first place is to simplify the work or everydays tasks by : 1) Making the tasks execute faster 2) Getting more reliable outputs then doing this by yourself 3) Making it repeatable . The LLMs obviously dont check any of these boxes so why don´t we stop pretending that we as users are stupid and don´t know how to use them and start taking them for what they are - cute little mirages, perhaps applicable as toys of some sort, but not something we should use for serious engineering work really?
Re:Two things LLM coding agents are still bad at by ivape on Thursday October 09, 2025 @03:52AM (#45524792)
Just stop. You need to take some time and run some Google searches before 2022 on HN and just read how blind sided this community has been by AI. Take the L, like everyone else.

Quite frankly, discussion about LLMs being hype is not useful for an innovation focused community, especially when it’s utterly wrong. The AI-is-hype people are so wrong, oh so wrong. This will be fun to revisit in just a year.

Re:Two things LLM coding agents are still bad at by exe34 on Thursday October 09, 2025 @03:59AM (#45524840)
I take it you have bought stocks? What do you recommend?
Re:Two things LLM coding agents are still bad at by jsjshxnsbs on Thursday October 09, 2025 @04:18AM (#45524956)
I'll take the L when llms can actually do my job to the level I expect. Llms can do some of my work but they are tiring they make mistakes and they absolutely get confused by a sufficiently complex and large codebase.

Quite frankly, not being able to discuss the pros and the cons of a technology with other engineers absolutely hinders innovation. A lot of discoveries come out of mistakes.

Stop being so small minded.

Re:Two things LLM coding agents are still bad at by laterium on Thursday October 09, 2025 @02:19PM (#45531215)
Why is the bar for it to do your job or completely replace you? It's a tool. If it makes you 5% better at your job, then great. There's a recent study showing it has 15-20% productivity benefits: not completely useless, not 10x. I hope we can have nuance in the conversation.
Re:Two things LLM coding agents are still bad at by hansmayer on Friday October 10, 2025 @08:07AM (#45538000)
...and then there was also a recent MIT study showing it was making everyone less productive. The bar is there because this is how all the AI grifters have been selling this technology - no less than end of work itself. Why should we not hold them accountable for over-promising and under-delivering? Or is that reserved just for the serfs?
Re:Two things LLM coding agents are still bad at by hansmayer on Thursday October 09, 2025 @04:45AM (#45525126)
Stop what mate? My words are not the words of someone who ocassionally dabbles in the free ChatGPT layer - I've been paying premium tier AI tools for my entire company for a long time now. Recently we had to scale back their usage to just consulting mode, i.e. because the agent mode has gone from somewhat-useful to complete waste of time. We are now back to using them as replacement for the now entshittified search. But as you can see by my early adopting of these crap-tools, I am open-minded. I'd love to see what great new application you have built using them. But if you don't have anything to show, I'll also take some arguments, you know, like the stuff I provided in my first comment.
Re:Two things LLM coding agents are still bad at by IanCal on Thursday October 09, 2025 @08:39AM (#45526801)
They easily check a bunch of those boxes.

> why don´t we stop pretending that we as users are stupid and don´t know how to use them

This is in response to someone who saw a bunch of URLs coming out of it and was surprised at a bunch of them being wrong. That's using the tool wrong. It's like being surprised that the top results in google/app store/play store aren't necessarily the best match for your query but actually adverts!

Re:Two things LLM coding agents are still bad at by hansmayer on Thursday October 09, 2025 @09:08AM (#45527183)
The URLs being wrong in that specific case is one where they were using the "wrong tool". I can name you at least a dozen other cases from own experience, where too, they appear to be the wrong tool, for example for working with Terraform or for not exposing secrets by hardcoding them in the frontend. Et cetera. Many other people will have contributed thousands if not more similar but different cases. So what good are these tools then for really? Are we all really that stupid? Many of us mastered the hard problem of navigating various abstraction layers of computer over the years, only to be told, we now effing dont know how to write a few sentences in English? Come on. I'd be happy to use them in whatever specific domain they supposedly excel at. But no-one seems to be able to identify one for sure. The problem is, the folks pushing or better said, shoving down these bullshit generators down our throats are trying to sell us the promise of an "everything oracle". What did old man Altman tell us about ChatGPT 5? PhD level tool for code generation or some similar nonsense? But it turns out it only gets one metric right each time - generating a lot of text. So, essentially, great for bullshit jobs (i count some of the IT jobs as such too), but not much more.
Re:Two things LLM coding agents are still bad at by IanCal on Thursday October 09, 2025 @09:41AM (#45527569)
> Many of us mastered the hard problem of navigating various abstraction layers of computer over the years, only to be told, we now effing dont know how to write a few sentences in English? Come on.

If you're trying to one shot stuff with a few sentences then yes you might be using these things wrong. I've seen people with PhDs fail to use google successfully to find things, were they idiots? If you're using them wrong you're using them wrong - I don't care how smart you are in other areas. If you can't hand off work knowing someones capabilities then that's a thing you can't do - and that's ok. I've known unbelievably good engineers who couldn't form a solid plan to solve a business problem or collaboratively work to get something done to save their life. Those are different skills. But gpt5-codex and sonnet 4 / 4.5 can solidly write code, gpt-5-pro with web search can really dig into things, and if you can manage what they can do you can hand off work to them. If you've only ever worked with juniors with a feeling of "they slow everything down but maybe someday they'll be as useful as me" then you're less likely to succeed at this.

Let's do a quick overview of recent chats for me:

* Identifying and validating a race condition in some code

* Generating several approaches to a streaming issue, providing cost analyses of external services and complexity of 3 different approaches about how much they'd change the code

* Identifying an async bug two good engineers couldn't find in a codebase they knew well

* Finding performance issues that had gone unnoticed

* Digging through synapse documentation and github issues to find a specific performance related issue

* Finding the right MSC for a feature I wanted to use but didn't know existed - and then finding the github issue that explained how it was only half implemented and how to enable the experimental other part I needed

* Building a bunch of UI stuff for a short term contract I needed, saving me a bunch of hours and the client money

* Going through funding opportunities and matching them against a charity I want to help in my local area

* Building a search integration for my local library to handle my kids reading challenge

* Solving a series of VPN issues I didn't understand

* Writing a lot of astro related python for an art project to cover the loss of some NASA images I used to have access to.

> the folks pushing or better said

If you don't want to trust them, don't. Also don't believe the anti-hype merchants who want to smugly say these tools can't do a god damn thing. They're trying to get attention as well.

Re:Two things LLM coding agents are still bad at by hansmayer on Thursday October 09, 2025 @10:03AM (#45527877)
Again mate, stop making arrogant assumptions and read some of my previous comments. I and my team are early adopters, since about 2 years. I am even paying for premium-level service. Trust me, it sucks and under-delivers. But good for you and others who claim they are productive with it - I am sure we will see those 10x apps rolling in soon, right? It's only been like 4 years since the revolutionary magic machine was announced.
Re:Two things LLM coding agents are still bad at by IanCal on Thursday October 09, 2025 @10:28AM (#45528191)
I read your comments. Did you read mine? You can pass them into chatgpt or claude or whatever premium services you pay for to summarise them for you if you want.

> Trust me, it sucks

Ok. I'm convinced.

> and under-delivers.

Compared to what promise?

> I am sure we will see those 10x apps rolling in soon, right?

Did I argue that? If you want to look at some massive improvements, I was able to put up UIs to share results & explore them with a client within minutes rather than it taking me a few hours (which from experience it would have done).

> It's only been like 4 years since the revolutionary magic machine was announced.

It's been less than 3 since chatgpt launched, which if you'd been in the AI sphere as long as I had (my god it's 20 years now) absolutely was revolutionary. Over the last 4 years we've seen gpt3 solve a bunch of NLP problems immediately as long as you didn't care about cost to gpt-5-pro with web search and codex/sonnet being able to explore a moderately sized codebase and make real and actual changes (running tests and following up with changes). Given how long I spent stopping a robot hitting the table because it shifted a bit and its background segmentation messed up, or fiddling with classifiers for text, the idea I can get a summary from input without training is already impressive and then to be able to say "make it less wanky" and have it remove the corp speak is a huge shift in the field.

If your measure of success is "the CEOs of the biggest tech orgs say it'll do this soon and I found a problem" then you'll be permanently disappointed. It'd be like me sitting here saying mobile phones are useless because I was told how revolutionary the new chip in an iphone was in a keynote.

Since you don't seem to want to read most of this, most isn't for you. The last bit is, and it's just one question:

Why are you paying for something that solves literally no problems for you?

Re:Two things LLM coding agents are still bad at by hitarpetar on Thursday October 09, 2025 @11:37AM (#45529198)
it's amazing that you picked another dark pattern as your comparison
Re:Two things LLM coding agents are still bad at by mbesto on Thursday October 09, 2025 @11:27AM (#45529054)
> This is in response to someone who saw a bunch of URLs coming out of it and was surprised at a bunch of them being wrong. That's using the tool wrong. It's like being surprised that the top results in google/app store/play store aren't necessarily the best match for your query but actually adverts!

The CEO of Anthropic said I can fire all of my developers soon. How could one possibly be using the tool wrong? /s

Re:Two things LLM coding agents are still bad at by IanCal on Thursday October 09, 2025 @11:51AM (#45529390)
If you base all your tech workings on the promises of CEOs you'll fail badly, you should not be surprised by this.
Re:Two things LLM coding agents are still bad at by mbesto on Friday October 10, 2025 @09:01AM (#45538519)
Thanks for the advice...
Re:Two things LLM coding agents are still bad at by doikor on Thursday October 09, 2025 @03:14AM (#45524523)
I would generalise it to you can’t trust LLMs to generate any kind of unique identifier. Sooner or later it will hallucinate a fake one.
Re:Two things LLM coding agents are still bad at by wat10000 on Thursday October 09, 2025 @10:53AM (#45528544)
I would generalize it further: you can't trust LLMs.

They're useful, but you must verify anything you get from them.

Re:Two things LLM coding agents are still bad at by grey-area on Thursday October 09, 2025 @03:17AM (#45524541)
Or just not bother. It sounds pretty useless if it flunks on basic tasks like this.

Perhaps you’ve been sold a lie?

Re:Two things LLM coding agents are still bad at by ivape on Thursday October 09, 2025 @03:22AM (#45524574)
Well, you see it hallucinates on long precise strings, but if we ignore that, and focus on what it’s powerful at, we can do something powerful. In this case, by the time it gets to outputting the url, it already determined the correct intent or next action (print out a url). You use this intent to do a tool call to generate a url. Small aside, it’s ability to figure what and why is pure magic, for those still peddling the glorified autocomplete narrative.

You have to be able to see what this thing can actually do, as opposed to what it can’t.

Re:Two things LLM coding agents are still bad at by sebtron on Thursday October 09, 2025 @03:55AM (#45524810)
> Well, you see it hallucinates on long precise strings

But all code is "long precise strings".

Re:Two things LLM coding agents are still bad at by ogogmad on Thursday October 09, 2025 @06:47AM (#45525879)
He obviously means random unstructured strings, which code is usually not.
Re:Two things LLM coding agents are still bad at by grey-area on Thursday October 09, 2025 @12:08PM (#45529660)
I can’t even tell if you’re being sarcastic about a terrible tool or are hyping up LLMs as intelligent assistants and telling me we’re all holding it wrong.
Re:Two things LLM coding agents are still bad at by IanCal on Thursday October 09, 2025 @08:47AM (#45526906)
They're moderately unreliable text copying machines if you need exact copying of long arbitrary strings. If that's what you want, don't use LLMs. I don't think they were ever really sold as that, and we have better tools for that.

On the other hand, I've had them easily build useful code, answer questions and debug issues complex enough to escape good engineers for at least several hours.

Depends what you want. They're also bad (for computers) at complex arithmetic off the bat, but then again we have calculators.

Re:Two things LLM coding agents are still bad at by goalieca on Thursday October 09, 2025 @09:44AM (#45527622)
> I don't think they were ever really sold as that, and we have better tools for that.

We have OpenAI calling gpt5 as having PhD level of intelligence and others like Anthropoc saying it will write all our code within months. Some are claiming it’s already writing 70%.

I say they are being sold as a magical do everything tool.

Re:Two things LLM coding agents are still bad at by IanCal on Thursday October 09, 2025 @11:23AM (#45528980)
Intelligence isn't the same as "can exactly replicate text". I'm hopefully smarter than a calculator but it's more reliable at maths than me.

Also there's a huge gulf between "some people claim it can do X" and "it's useful". Altman promising something new doesn't decrease the usefulness of a model.

Re:Two things LLM coding agents are still bad at by mbesto on Thursday October 09, 2025 @11:33AM (#45529152)
What you are describing is "dead reasoning zones".[0]

    "This isn't how humans work. Einstein never saw ARC grids, but he'd solve them instantly. Not because of prior knowledge, but because humans have consistent reasoning that transfers across domains. A logical economist becomes a logical programmer when they learn to code. They don't suddenly forget how to be consistent or deduce.

    But LLMs have "dead reasoning zones" — areas in their weights where logic doesn't work. Humans have dead knowledge zones (things we don't know), but not dead reasoning zones. Asking questions outside the training distribution is almost like an adversarial attack on the model."

https://jeremyberman.substack.com/p/how-i-got-the-highest-sc...
Re:Two things LLM coding agents are still bad at by hitarpetar on Thursday October 09, 2025 @11:39AM (#45529239)
saddest goalpost ever
Re:Two things LLM coding agents are still bad at by buildbot on Thursday October 09, 2025 @10:57AM (#45528615)
Would you hire a PhD to copy URLs by hand? Would them having PhD make it less likely they’d make a mistake than an high school student doing the same?
Re:Two things LLM coding agents are still bad at by hitarpetar on Thursday October 09, 2025 @11:54AM (#45529444)
I would not hire anyone for a role that requires computer use who does not know how to use copy/paste
Re:Two things LLM coding agents are still bad at by goalieca on Thursday October 09, 2025 @11:25AM (#45529011)
Grad students and even post docs often do a lot of this manual labour for data entry and formatting. Been there, done that.
Re:Two things LLM coding agents are still bad at by IanCal on Thursday October 09, 2025 @11:53AM (#45529426)
Manual data entry has lots of errors. All good workflows around this base themselves on this fact.
Re:Two things LLM coding agents are still bad at by parineum on Thursday October 09, 2025 @11:25AM (#45529015)
A high school student would use copy/paste and the urls would be perfect duplicates..
Re:Two things LLM coding agents are still bad at by IanCal on Thursday October 09, 2025 @11:52AM (#45529407)
> A high school student would use copy/paste and the urls would be perfect duplicates..

Did the LLM have this?

Re:Two things LLM coding agents are still bad at by baq on Thursday October 09, 2025 @03:54PM (#45532285)
LLMs aren’t high school students, they’re blobs of numbers which happen to speak English if you poke them right. Use the tool when it’s good at what it does.
Re:Two things LLM coding agents are still bad at by parineum on Thursday October 09, 2025 @10:03PM (#45534811)
And the people who are causing this confusion are the CEOs of the companies saying that the newest model is a PHD in your pocket.
Re:Two things LLM coding agents are still bad at by laterium on Thursday October 09, 2025 @02:32PM (#45531353)
They are lying, because their salary depends on them lying about it. Why does it even matter what they're saying? Why don't we listen to scientists, researchers, practicioners and the real users of the technology and stop repeating what the CEOs are saying?

The things they're saying are technically correct, the best kind of correct. The models beat human PhDs on certain benchmarks of knowledge and reasoning. They may write 70% of the easiest code in some specific scenario. It doesn't matter. They're useful tools that can make you slightly more productive. That's it.

When you see on tv that 9 out of 10 dentists recommend a toothpaste what do you do? Do you claim that brushing your teeth is a useless hype that's being pushed by big-tooth because they're exaggerating or misrepresenting what that means?

Re:Two things LLM coding agents are still bad at by culll_kuprey on Thursday October 09, 2025 @03:00PM (#45531680)
> When you see on tv that 9 out of 10 dentists recommend a toothpaste what do you do? Do you claim that brushing your teeth is a useless hype that's being pushed by big-tooth because they're exaggerating or misrepresenting what that means?

Only after schizophrenic dentists go around telling people that brushing their teeth is going to lead to a post-scarcity Star Trek world.

Re:Two things LLM coding agents are still bad at by laterium on Thursday October 09, 2025 @03:14PM (#45531852)
It's a new technology which lends itself well to outrageous claims and marketing, but the analogy stands. The CEOs don't get to define the narrative or stand as strawman targets for anti-AI folks to dunk on, sorry. Elon has been repeating "self driving next year" for a decade+ at this point, that doesn't make what Waymo did unimpressive. This level of cynicism is unwarranted is what I'm saying.
Re:Two things LLM coding agents are still bad at by IanCal on Thursday October 09, 2025 @11:52PM (#45535232)
You shouldn’t - that’s the point of the comparison. If some insane dentists started saying this you should not stop brushing your teeth!
Re:Two things LLM coding agents are still bad at by grey-area on Thursday October 09, 2025 @02:54PM (#45531619)
So questioning the utility of LLMs for knowledge work is now akin to a conspiracy theory?
Re:Two things LLM coding agents are still bad at by laterium on Thursday October 09, 2025 @03:23PM (#45531974)
Not what I said at all. Question it all what you want. But disproving outrageous CEO claims doesn't get you there. Whether LLMs are AGI/ASI that will replace everyone is seperate from whether they are useful today as tools. Attacking the first claim doesn't mean much for the second claim, which is the more interesting one.
Re:Two things LLM coding agents are still bad at by grey-area on Saturday October 11, 2025 @12:43PM (#45550558)
I'm questioning the basic utility. They are text generation machines. This makes them unsuitable for any work that requires accuracy or understanding, which is the vast majority of knowledge work.
Re:Two things LLM coding agents are still bad at by seanw265 on Thursday October 09, 2025 @10:40AM (#45528361)
I suspect you haven't tried a modern mid-to-large-LLM & Agent pair for writing code. They're quite capable, even if not suited for all tasks.
Re:Two things LLM coding agents are still bad at by baq on Thursday October 09, 2025 @03:51PM (#45532249)
Read about the jagged frontier. IanCal is right: this is a perfect example of using the tool wrong; you’ve focused on a very narrow use case which is surprisingly hard for the matmuls to not mess up and extrapolate, but extrapolation is incorrect here because the capability frontier is fractal and not continuous.
Re:Two things LLM coding agents are still bad at by grey-area on Friday October 10, 2025 @03:21AM (#45536176)
It’s not surprisingly hard at all, when you consider they have no understanding of the tasks they do nor of the subject material. It’s just a good example of the types of tasks (anything requiring reliability or correct results) that they are fundamentally unsuited to.

Sadly it seems the best use-case for LLMs at this point is bamboozling humans.

Re:Two things LLM coding agents are still bad at by baq on Friday October 10, 2025 @06:33AM (#45537264)
When you take a step back it's surprising that these tools can be actually useful at all in nontrivial tasks, but being surprised doesn't matter in the grand scheme of things. Bamboozling rarely enough for harnesses to keep them in line and ability to inference-time self-correct when bamboozling is detected either by the model itself or by the harness is very useful at least in my work. It's a question of using the tool correctly and understanding its limitations, which is hard if you aren't willing to explore the boundaries and commit to doing it every month basically.
Re:Two things LLM coding agents are still bad at by jollyllama on Thursday October 09, 2025 @08:20AM (#45526602)
> You’re just not using LLMs enough.

> You can never trust the LLM to generate a url

This is very poorly worded. Using LLMs more wouldn't solve the problem. What you're really saying is that the GP is uninformed about LLMs.

This may seem like pedantry on my part but I'm sick of hearing "you're doing it wrong" when the real answer is "this tool can't do that." The former is categorically different than the latter.

Re:Two things LLM coding agents are still bad at by IanCal on Thursday October 09, 2025 @08:42AM (#45526848)
It's pretty clearly worded to me, they don't use LLMs enough to know how to use them successfully. If you use them regularly you wouldn't see a set of urls without thinking "Unless these are extremely obvious links to major sites, I will assume each is definitely wrong".

> I'm sick of hearing "you're doing it wrong"

That's not what they said. They didn't say to use LLMs more for this problem. The only people that should take the wrong meaning from this are ones who didn't read past the first sentence.

> when the real answer is "this tool can't do that."

That is what they said.

Re:Two things LLM coding agents are still bad at by jollyllama on Thursday October 09, 2025 @09:07AM (#45527173)
> If you use them regularly you wouldn't see a set of urls without thinking...

Sure, but conceivably, you could also be informed of this second hand, through any publication about LLMs, so it is very odd to say "you don't use them enough" rather than "you're ignorant" or "you're uninformed". It is very similar to these very bizarre AI-maximalist positions that so many of us are tired of seeing.

Re:Two things LLM coding agents are still bad at by IanCal on Thursday October 09, 2025 @09:16AM (#45527282)
This isn't ai maximalist though, it's explicitly pointing out something that regularly does not work!

> Sure, but conceivably, you could also be informed of this second hand, through any publication about LLMs, so it is very odd to say "you don't use them enough" rather than "you're ignorant" or "you're uninformed".

But this is to someone who is actively using them, and the suggestion of "if you were using them more actively you'd know this, this is a very common issue" is not at all weird. There are other ways they could have known this, but they didn't.

"You haven't got the experience yet" is a much milder way of saying someone doesn't know how to use a tool properly than "you're ignorant".

Re:Two things LLM coding agents are still bad at by fwip on Thursday October 09, 2025 @11:48AM (#45529364)
I think part of the issue is that it doesn't "feel" like the LLM is generating a URL, because that's not what a human would be doing. A human would be cut & pasting the URLs, or editing the code around them - not retyping them from scratch.

Edit: I think I'm just regurgitating the article here.