Depends what you see as flawless. From my perspective even GPT 5.2 produces mostly garbage grade code (yes it often works, but it is not suitable for anywhere near production) and takes several iterations to get it to remotely workable state.

> not suitable for anywhere near production

This is what I've been increasingly understanding is the wrong way to understand how LLMs are changing things.

I fully agree that LLMs are not suitable for creating production code. But the bigger question you need to ask is 'why do we need production code?' (and to be clear, there are and always will be cases where this is true, just increasingly less of them)

The entire paradigm of modern software engineering is fairly new. I mean it wasn't until the invention of the programmable microprocessor that we even had the concept of software and that was less than 100 years ago. Even if you go back to the 80s, a lot of software doesn't need to be distributed or serve a endless variety of users. I've been reading a lot of old Common Lisp books recently and it's fascinating how often you're really programming lisp for you and your experiments. But since the advent of the web and scaling software to many users with diverse needs we've increasingly needed to maintain systems that have all the assumed properties of "production" software.

Scalable, robust, adaptable software is only a requirement because it was previously infeasible for individuals to build non-trivial systems for solving any more than a one or two personal problems. Even software engineers couldn't write their own text editor and still have enough time to also write software.

All of the standard requirements of good software exist for reasons that are increasingly becoming less relevant. You shouldn't rely on agents/LLMs to write production code, but you also should increasingly question "do I need production code?"