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Same weights moved from a Transformers eval to vLLM; the score fell and some answers stop mid-sentence. Find the cause.

Nothing about the model changed, yet the eval moved and answers end early. The answer refuses to look at kernels until the prompt token IDs and the resolved sampling settings match, and shows the two engine defaults that change both without an error.

Updated Nov 2026 · Worked answers on inference mechanisms, with calculations, implementation details, and follow-up questions.

Nothing about the model changed, yet the eval moved and answers end early. The answer refuses to look at kernels until the prompt token IDs and the resolved sampling settings match, and shows the two engine defaults that change both without an error.

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