Yes GPT4 is marginally better, no it doesn't significantly change its usefulness for software development. It still misunderstands questions and tasks, it still forgets or ignores constraints almost immediately, it still uses libraries that don't exist, it still generates tons of plausible-sounding but ultimately flawed code that wastes more time than it saves (unless you couldn't code your way out of a wet paper bag to begin with).

It makes for a decent rubber duck and it can aid you in exploring the space of unknown unknowns when approaching a new subject, but that's about it in my experience.