Because benchmarks are meaningless and, despite having so many years of development, LLMs become crap at coding or producing anything productive as soon as you

Because benchmarks are meaningless and, despite having so many years of development, LLMs become crap at coding or producing anything productive as soon as you move a bit from the things being benchmarked. I wouldn't mind if GPT-5 was 500% better than previous models, but it's a small iterative step from "bad" to "bad but more robotic".