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GPT-4 is getting worse over time, not better.
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GPT is a pretrained model, "pretrained" is part of the name. It assumed to be static.
There is no gpt5, and gpt4 gets constant updates, so it's a bit of a misnomer at this point in its lifespan.
It's possible to apply a layer of fine-tuning "on top" of the base pretrained model. I'm sure OpenAI has been doing that a lot, and including ever more "don't run through puddles and splash pedestrians" restrictions that are making it harder and harder for the model to think.