[maccam912]

There is a parameter called "temperature" that determines randomness. I think there is never a guarantee of the same response, but generally with a low temperature (something like 0.0, the lowest but still not deterministic) I get nearly identical responses, if not actually identical. When temperature is increased though to e.g. default of 1.0 or max of 2.0, the same prompt will give very different responses. The higher the temperature the more creativity that is injected because of the randomness, but also the less determinism.