The performance of the model can be improved with tweaks to the prompt, but the tweaks end up being model-specific. This is why "prompt engineering" exists for

The performance of the model can be improved with tweaks to the prompt, but the tweaks end up being model-specific. This is why "prompt engineering" exists for productionized use cases instead of people just spitting words semi-randomly into a textbox. Your old prompts probably won't completely fail but they'll behave differently under a different model.