That’s fair - strict determinism isn’t possible in the traditional sense. I was thinking more along the lines of bounded reproducibility.

If the model, parameters, system prompt, and toolchain are pinned, you might not get identical output, but you can constrain the space of possible diffs.

It reminds me a bit of how StrongDM talks about reproducibility in their “Digital Twin” concept - not bit-for-bit replay, but reproducing the same observable behavior.