OpenAI GPT5 had better performance for some users like Theo at launch and before. However, it has gotten substantially worse as OpenAI has tried to address issues. Also, OpenAI was too aggressive with the removal of old models which they had to reverse. The coding and other actual experiences have shown far less improvement and many things like coding appear to have gotten worse.
There is also routing to cheaper models, which are inferior. There are some impressive things but there are problems with accuracy and other issues.
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Running out of human based data to mine. Synthetic data may help but even that has severe limits.
At some point LLMs saturate make future improvements meaningless.