LLM Determinism Debate

The cluster focuses on debates about whether Large Language Models (LLMs) produce deterministic outputs, highlighting issues like inherent randomness, sampling methods, seeds, floating-point variations, and execution environments that lead to inconsistent results for identical inputs.

➡️ Stable 1.9x AI & Machine Learning
3,335
Comments
20
Years Active
5
Top Authors
#3592
Topic ID

Activity Over Time

2007
1
2008
5
2009
14
2010
30
2011
24
2012
27
2013
37
2014
53
2015
59
2016
70
2017
102
2018
100
2019
125
2020
165
2021
131
2022
200
2023
463
2024
449
2025
1,137
2026
143

Keywords

AI CPU ASIC LLM SD FPGA OS thinkingmachines.ai SSE2 deterministic determinism llms llm seed non input output floating point token

Sample Comments

setq • Jun 27, 2017 • View on HN

That only works if you have some level of determinism.

cnnlives78 • Nov 4, 2025 • View on HN

The LLMs most of us are using have some element of randomness to every token selected, which is non-deterministic. You can try to attempt to corral that, but statistically, with enough iteration, it may provide nonsense, unintentional, dangerous, opposite solutions/answers/action, even if you have system instructions defining otherwise and a series of LLMs checking themselves. Be sure that you fully understand this. Even if you could make it fully deterministic, it would be determinist

overgard • Oct 15, 2025 • View on HN

Are you trying to say I'm old? Machines are deterministic.. LLM's are very much not.

arrow7000 • Feb 15, 2022 • View on HN

So in other words it's not perfectly deterministic at all?

korkybuchek • Oct 18, 2024 • View on HN

Interesting -- is there any impact from LLM outputs not being deterministic?

TOMDM • Jul 11, 2025 • View on HN

I think the better statement is likely "LLMs are typically not executed in a deterministic manner", since you're right there are no non deterministic properties interment to the models themselves that I'm aware of

Not sure that things are that deterministic.

input_sh • Oct 7, 2024 • View on HN

Or it's just non-deterministic, like with every LLM.

jdnend • Jun 30, 2025 • View on HN

Why wouldn't it be deterministic?

weakfish • Sep 10, 2023 • View on HN

This won’t ever work as long as LLMs are non deterministic