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Mind Your Tone: Does Tone Alter LLM Performance?

Om Dobariya, Akhil Kumar

May 27, 2026arXiv:2605.29027v1
cs.AIcs.CLcs.HC
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#3150 of 3753 · Artificial Intelligence
Tournament Score
1295±41
10501800
38%
Win Rate
10
Wins
16
Losses
26
Matches
Rating
4.5/ 10
Significance4.5
Rigor5
Novelty3.5
Clarity6

Abstract

The use of Large Language Models (LLMs) is proliferating, yet their performance is observed to vary based on prompting styles and tones. In this study, we investigate both whether and how tonal variations in prompts lead to disparate LLM accuracy for objective multiple-choice questions. We use two datasets: a 50-base question dataset with five tone variants and a 570-base question MMLU subset spanning 57 subjects with seven tone variants. Experiments were conducted to evaluate the performance of four cost-efficient, popular LLMs: ChatGPT-4o, ChatGPT-5-nano, Gemini 2.5 Flash, and Gemini 2.5 Flash Lite. Across models, tonal effects are systematic but highly model-dependent. Some models show small, yet statistically significant, shifts, while others exhibit large accuracy swings across tones. Further, we identify subject-level differences in tone sensitivity and present a routing framework to explain how tones may attune internal reasoning modes. Our findings caution users against assuming tone-robust reliability in LLM deployments.

AI Impact Assessments

(1 models)

Scientific Impact Assessment: "Mind Your Tone: Does Tone Alter LLM Performance?"

1. Core Contribution

This paper investigates whether the tone (on a rudeness-politeness spectrum) of prompts affects LLM accuracy on multiple-choice questions. The study uses two datasets—a custom 50-question set with 5 tone variants and a 570-question MMLU subset with 7 tone variants—tested across four LLMs (ChatGPT-4o, ChatGPT-5-nano, Gemini 2.5 Flash, Gemini 2.5 Flash Lite). The main finding is that tonal effects are systematic but highly model-dependent: some models show negligible sensitivity while others exhibit accuracy swings of up to 12.5 percentage points. The paper also proposes a speculative routing framework suggesting that tones may trigger different internal reasoning modes.

The core contribution is primarily empirical—documenting tone sensitivity across a specific set of models and conditions. The routing framework (Figure 1) is presented as a conceptual explanation but remains unvalidated.

2. Methodological Rigor

The paper demonstrates reasonable statistical care in several areas. The authors employ repeated-measures ANOVA, Friedman tests, paired t-tests with Holm correction, McNemar's exact tests, Cochran's Q, and FDR-controlled subject-level analyses. Effect sizes (Cohen's d_z) and non-parametric robustness checks are reported, which is commendable.

However, there are notable methodological concerns:

  • Dataset size and representativeness: The first dataset of 50 questions is very small and was generated by ChatGPT's Deep Research feature, raising concerns about data quality and circularity (using an LLM to generate test questions for LLMs). The MMLU subset of 570 questions (10 per subject) is larger but still limited—the authors themselves acknowledge "weak statistical power" at the subject level.
  • Tone operationalization: The tone variants are constructed through prefix additions to questions. The mapping between linguistic prefixes and perceived tones is assumed rather than validated (e.g., through human annotation or inter-rater agreement). The prefixes are quite different in length and content, introducing potential confounds beyond tone alone (e.g., instruction length, distraction from the core question).
  • Reproducibility concerns: LLM APIs are non-deterministic and change over time. The experiments were conducted in February 2026, and results may not replicate with updated model versions. Default temperature settings were used but not reported explicitly, and the interaction between temperature and tone effects is unexplored.
  • Confound with prompt length: Tone-laden prefixes add varying amounts of text. The Sycophantic and Threatening prefixes are substantially longer than the Neutral (no prefix) condition. Performance differences could partly reflect prompt length or instruction complexity rather than tone per se.
  • Ceiling effects: ChatGPT-5-nano and Gemini 2.5 Flash showed near-ceiling performance on the 50-question dataset (99%+), making tone effects undetectable. This limits the utility of Dataset 1 for three of the four models.
  • 3. Potential Impact

    The practical relevance is clear: as LLMs are deployed in enterprise settings, understanding that prompt phrasing—even seemingly irrelevant emotional framing—can alter accuracy is important for reliability assurance. The finding that some models lose 11+ percentage points under certain tones is operationally significant.

    However, the impact is tempered by several factors:

  • The findings are highly model-specific and likely ephemeral—newer model versions may behave differently.
  • The study is limited to multiple-choice questions, a narrow task format.
  • The proposed routing framework is entirely speculative and not validated, reducing its theoretical contribution.
  • The practical recommendation ("don't assume tone-robust reliability") is important but somewhat obvious given existing prompt sensitivity literature.
  • 4. Timeliness & Relevance

    The topic is timely. Prompt engineering is an active area of interest, and understanding how social/emotional cues in prompts affect LLM behavior is practically relevant. The paper builds on prior work by Yin et al. (2024) and others, extending it to newer models and more tone variants. The inclusion of extreme tones (Sycophantic, Threatening) adds novelty beyond the standard politeness spectrum.

    However, given the rapid pace of LLM development, findings tied to specific model versions (GPT-4o, Gemini 2.5 Flash, etc.) have a short shelf life. The paper would benefit from more generalizable theoretical insights.

    5. Strengths & Limitations

    Strengths:

  • Systematic experimental design with multiple models, tones, and repeated runs
  • Appropriate and diverse statistical analyses with proper corrections for multiple comparisons
  • Subject-level analysis revealing differential tone sensitivity across domains
  • Transparent data and code sharing via GitHub
  • Ethical consideration of findings (not advocating rude prompting despite performance gains)
  • Limitations:

  • The routing framework (Figure 1) is the most novel conceptual contribution but is entirely speculative with no empirical validation beyond latency observations
  • Tone operationalization lacks human validation and conflates tone with prompt length/complexity
  • Small sample sizes, especially for subject-level analyses (10 questions per subject)
  • No control for prompt length as a confound
  • Results are model-version-specific and may not generalize temporally
  • The paper does not explore interaction effects between tone and question difficulty or domain in a systematic way (e.g., through factorial analysis)
  • Missing comparison with random prompt perturbations as a baseline—are tone-specific effects stronger than arbitrary textual additions?
  • Additional Observations

    The paper reads as a solid conference-level empirical study suitable for the AMCIS venue, but its contribution to fundamental understanding is limited. The most interesting thread—that different tones may activate different computational pathways—deserves much deeper investigation. The latency analysis mentioned in passing (40% variation for Gemini 2.5 Flash Lite) could have been a compelling additional result if reported systematically. The disconnect between the empirical findings (which are careful) and the theoretical framework (which is speculative) weakens the overall contribution.

    Rating:4.5/ 10
    Significance 4.5Rigor 5Novelty 3.5Clarity 6

    Generated May 29, 2026

    Comparison History (26)

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