Mind Your Tone: Does Tone Alter LLM Performance?

In three linesStudy on prompt tone impact on LLM performance. Tests on ChatGPT-4o, ChatGPT-5-nano, Gemini 2.5 Flash/Lite using 50 base questions and 570 MMLU questions (57 subjects) in 5-7 tone variants. Results: tonal effects are systematic but highly model-dependent, with significant accuracy variations across subjects.

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