[m3galinux]

ChatGPT when asked this question answers that its responses are probabilistic, so the responses aren't reproducible. I tested that myself, of course. Since it gave me 2 different (but overall equivalent) answers from the same prompt I'd have to agree.

[clbrmbr]

That’s because it’s configured to with non-zero temperature. I’d you use the underlying model API, or the playground, you can get repeatable results when temperature is zero.

[xyzzyz]

Mostly, yes, but there have been reported cases where even with zero temperature, you get nondeterminism, probably due to accumulation of errors due to different operation order on floating points.

[sdenton4]

You can also generally set an RNG seed to get reproducible results.