OpenAI has been at least one year ahead of everyone else in everything they have released do far. And there’s no sign they are stopping any time soon (e.g. GPT5 is expected this year).
GPT-5 will likely only see improvements in deductive reasoning like in math, I think it there are diminishing returns if all GPT-5 is a larger transformer than GPT-4
That’s probably what GPT-4.5 will be. The bar is much higher for GPT-5.