There's a lot of non-ergonomic copy and pasting but it's definitely using an LLM to build a full application.
> Starting back in 2022/2023:
> - (~2022) It can auto-complete one line, but it can't write a full function.
> - (~2023) Ok, it can write a full function, but it can't write a full feature.
This was a direct refutation, with evidence, that in 2023 people were not claiming that LLMs "can't write a full feature", because, as demonstrated, people were already building full applications with it at the time.
This obviously is not talking exclusively about agents, because agents did not exist in 2022.
Also, just because SOMEONE planted a flag in 2023 saying that an LLM could build an app certainly does NOT mean that "people were not claiming that LLMs "can't write a full feature"". People in this very thread are still claiming LLMs can't write features. Opinions vary.
They're definitely better now, but it's not like ChatGPT 3.5 couldn't write a full simple todo list app in 2023. There were a billion blog posts talking about that and how it meant the death of the software industry.
Plus I'd actually argue more of the improvements have come from tooling around the models rather than what's in the models themselves.
[0] eg https://www.youtube.com/watch?v=GizsSo-EevA