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vLLM Temperature 0 Isn't Deterministic: 23 of 200 Answers Changed

My regression test for a prompt change failed on a Tuesday. I hadn't touched the prompt yet. Same model, same weights, same vLLM server, same 200 eval prompts, temperature=0 . I ran the suite twice in a row and 23 of the 200 answers came back different. Not paraphrased-different. Some of them reach…

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  1. 2026-10-18 11:25 · DEV Community — Machine Learning
    vLLM Temperature 0 Isn't Deterministic: 23 of 200 Answers Changed

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