this post was submitted on 01 Jun 2026
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I'm pretty sure LLM are deterministic in design.
The fact it doesn't give the same output for the same prompt is just a choice of the programmers to add randomness so it feels more natural.
But you can totally setup some LLMs to be perfectly deterministic.
Got any sources to back up that claim?
A good start is this :
https://thinkingmachines.ai/blog/defeating-nondeterminism-in-llm-inference/
While it's hard to get perfect determinism you can still get very close. But really I think it's accurate to say that LLM are random because they are configured to be.