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Why LLMs can't really build software
(zed.dev)
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this post was submitted on 15 Aug 2025
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I have next to zero experience about coding (unless you count a few months of Borland Delphi work back in 00’s, which you shouldn’t). Yet, I’ve managed to create half a dozen really useful tools for my work, and a few more for my hobbies too.
Inflection point for me was Gemini 2.5 Pro. Before that I was only successful with smaller scripts, using ChatGPT mostly. But with Gemini I was able to do Deep Research as the initial step to plan out the overall architecture, interfaces, technologies etc. and finetune the actual coding prompt using that info.
Crucial step after first generated (buggy) version is to copy paste the code and errors to ChatGPT and/or Grok to get their take on it, then feed back those ideas to Gemini again. Some 5-10 iterations of this and I usually have a fully functional application or a component of bigger piece software. Problems at the moment usually arise if any particular file exceeds ~800 lines, and when there are many many iterations. Then LLMs tend to get forgetful, dropping out comments, reintroducing faults from earlier iterations etc. Better to start a new session at that point.
Thinking of LLMs as just a lossy compression algo for all human knowledge, the parallel use of LLMs makes kind of sense: All the companies use approximately the same data in their training, but end up having a bit different looking ”lossy big picture” in the end. But if I ”look at all these pictures” side by side I can perhaps see more detail. Or that some of the pictures are fuzzy on one location but one is much clearer.
LLM’s seem to be very good to at spotting the correct solution when they are given a couple options or hypothesis about an cause of an issue. Most surprising to me is that Grok has been the one to solve majority of the most stubborn bugs that other have gotten stuck to.
With (Edit:) Gemini I just had my first ”hole in one” where it generated a flawless ~500 line web app in the very first try. Just gave it my Git codebase as a zip file and asked for a new module that interfaces the existing stuff. Wild times.