REVIEW 3 major objections 5 minor 1 cited by
Asking Again and Again: Exploring LLM Robustness to Repeated Questions
T0 review · 3 major / 5 minor · reviewed 2026-08-11 · deepseek-v4-flash
Pith's one-line read Repeating a question 1, 3, or 5 times within a prompt does not significantly change the reading-comprehension accuracy of large language models, across five models, three datasets, and four prompt settings.
desk verdict A clean, honest null-result study on question repetition that overreaches its pooled statistics when claiming 'no meaningful impact' per setting. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The key machinery is a controlled prompt-repetition experiment with four configurations: open-book (context before question), closed-book (no context), question-context-question (QCQ, question both before and after context), and paraphrasing (original question plus model-generated paraphrases appended to context). Repetition levels are Qx1, Qx3, and Qx5, and accuracy is measured by substring matching of the gold answer. The statistical workhorse is the Friedman test, a non-parametric repeated-measures test that ranks the three repetition conditions within each experimental block; here it produced a p-value of 0.70, which carries the conclusion that repetition has no significant aggregate effect.
What would settle it
Run the same 90,000-question experiment but perform separate Friedman tests or paired comparisons for each model × dataset × configuration cell (or at least for cells with large swings, such as Llama-3.1 closed-book HotPotQA, which rises from 0.24 to 0.30, or Mistral open-book HotPotQA, which falls from 0.51 to 0.48). If any cell shows a statistically significant difference across Qx1, Qx3, and Qx5 after multiple-comparison correction, the blanket 'no meaningful impact' claim would be false. A simpler check is a permutation test that respects block structure to see whether the observed 6% gains exceed what chance would produce, or a larger-sample replication of one high-swing cell to determine whether the difference is real.
Extended reading notes
Core claim
The central claim is that question repetition within a prompt neither significantly improves nor significantly degrades LLM performance across all models, datasets, and settings tested. The evidence comes from 90,000 questions (500 sampled per dataset × 3 repetition levels × 4 configurations × 3 datasets × 5 models), with accuracy measured by substring matching. A Shapiro-Wilk test showed non-normality, so the authors used the non-parametric Friedman test on the pooled accuracy scores across repetition levels; the test statistic was 0.7118 with p = 0.70. Individual configurations show contrasting movements—for example, Llama-3.1 closed-book HotPotQA rises from 0.24 to 0.30 from Qx1 to Qx5, while Mistral open-book HotPotQA falls from 0.51 to 0.48—but the aggregate analysis treats these as noise. The authors interpret this as evidence that LLMs process the question effectively regardless of how many times it is repeated, and that repetition does not encourage the model to focus more on the repeated information.
Load-bearing premise
The blanket conclusion rests on the assumption that pooling all models, datasets, and configurations into one Friedman test is a valid way to detect repetition effects, which requires that meaningful repetition effects, if any, are consistent enough in direction to show up in the global rank comparison.
Editorial extensions
If this is right
- Question repetition is not a dependable prompt-engineering technique for reading-comprehension tasks; practitioners should not expect verbatim or paraphrased repetition to improve accuracy.
- The tested LLMs are robust to redundant phrasing, suggesting that simply showing a question multiple times does not strengthen the model's attention to it.
- The null result contrasts with prior work showing benefits from instructing models to restate questions, so the mechanism behind such gains is not mere repeated presentation.
- The conclusion holds across a wide range of model sizes (7B to 685B) and context conditions, indicating a general robustness rather than a quirk of a single model.
- Any true repetition effects that exist are likely small and setting-specific, and would require larger samples or per-condition analyses to detect reliably.
Reading between the lines
- The single pooled Friedman test may cancel out opposing effects: if repetition helps smaller models in closed-book settings but hurts others, the aggregate null result could hide real, heterogeneous behavior that a per-cell analysis would reveal.
- The 500-question subsamples may be underpowered for detecting small but genuine accuracy differences; a power analysis could show whether the experiment could have detected a 1–2% effect, and if not, the 'no meaningful impact' conclusion is weaker than it appears.
- The paper's own limitation about causal-only models suggests an untested extension: masked or encoder-only language models might show a different sensitivity to question repetition, since they process input dependencies differently.
- The interaction between repetition and explicit instructions (e.g., 'focus on the repeated question') is not tested here; combining repetition with such directives could still produce a measurable effect, contrary to the paper's broad null framing.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper investigates whether repeating a question 1, 3, or 5 times within a single prompt affects the accuracy of five LLMs (GPT-4o-mini, DeepSeek-V3, Llama-3.1 8B, Mistral 7B, Phi-4 14B) on SQuAD, HotPotQA, and Natural Questions, under open-book, closed-book, question-context-question, and paraphrasing configurations. Accuracy is measured by substring matching on 500 sampled questions per condition, for a total of 90,000 prompted evaluations. A Friedman test across the pooled condition blocks yields p=0.70, and the authors conclude that question repetition neither significantly improves nor significantly degrades performance across all models, datasets, and settings. The paper also reports descriptive per-configuration trends, including a 6% accuracy gain for Llama-3.1 on closed-book HotPotQA.
Significance. This is a carefully executed empirical study with a clearly stated null result. The scope is substantial: five recent LLMs, three QA benchmarks, four prompt configurations, and 500 questions per condition. The main positive finding—that literal question repetition produces at most small accuracy changes on reading-comprehension tasks—is a useful data point for prompt engineering, and the paper correctly contrasts with EchoPrompt's restatement-based gains. However, the statistical support for the strong universal claim is currently inadequate, as detailed in the major comments.
major comments (3)
- [§3.3, Appendix C.1, Table 1] The universal negative claim—that question repetition 'neither significantly improves nor significantly degrades the performance of LLMs across all models, datasets, and settings'—is supported only by a single Friedman test on pooled block ranks. This test is not sensitive to effects that are large in a few cells but opposite in direction across the 60 model×configuration×dataset blocks. Table 1 shows several 3–6 percentage point changes (e.g., Llama-3.1 closed-book HotPotQA Qx1=0.24 vs. Qx5=0.30; Mistral 7B open-book HotPotQA Qx1=0.51 vs. Qx5=0.48). With n=500 per cell, a 6-point difference is roughly two standard errors and may be statistically significant for that cell. The paper reports no per-cell significance tests, confidence intervals, effect sizes, or power analysis. Interpreting p=0.70 as 'no meaningful impact' therefore conflates absence of evidence with evidence of absence. I request per-cell paired tests (e.g., McNemar) with multiple-comparison correction, plus a power analysis showing the detectable effect size at n=500.
- [§2.1, Appendix A.4] The Paraphrasing configuration is pooled together with the identical-repetition conditions in the Friedman test, but it is a different manipulation: it introduces model-generated paraphrases rather than literal repetition. If repetition effects are masked by paraphrase noise, pooling reduces power. The paper should either analyze Paraphrasing separately or provide a justification for pooling. Also, the definition of repetition levels for Paraphrasing is unclear: Qx3 appears to correspond to one original plus two paraphrases, not three repetitions, so the column labels are misleading.
- [Abstract, §3.1] The abstract states that repetition 'can increase models’ accuracy by up to 6%' while §3.3 concludes there is 'no meaningful impact.' These statements are not contradictory only if the 6% increase is shown to be statistically indistinguishable from noise. The paper does not provide a confidence interval for that 6% cell (Llama-3.1 closed-book HotPotQA), so the reader cannot evaluate whether the largest observed effect is real. Please report the uncertainty around the largest per-cell differences, or soften the universal claim to 'no consistent statistically significant effect across the pooled analysis.'
minor comments (5)
- [§3.1, §3.2] There are subject-verb agreement errors, e.g., 'performance remain stable' (§3.1) and 'NQ show the smallest' (§3.2); the manuscript should be proofread for such grammatical issues.
- [§2.3] The phrase 'total of 90,000 questions' is ambiguous; since the same 500 questions are reused across all 180 settings, the correct description is 90,000 prompted evaluations, not 90,000 unique questions.
- [Appendix A] The prompt templates are only described with placeholders; for reproducibility, please provide the exact full prompts for Qx1, Qx3, and Qx5 in each configuration.
- [General] No code, data, or model-output release is mentioned; given the use of API models, releasing the prompt templates, sampled question IDs, and inference configuration would substantially improve reproducibility.
- [Figures] Figures 2–5 are referenced in the text but appear after the appendix; please ensure all figures are called out in numerical order in the final version and that captions are self-contained.
Circularity Check
No significant circularity: the study is an empirical benchmark evaluation whose conclusion rests on direct model outputs and external datasets, not on fitted parameters or self-referential derivation.
full rationale
The paper's central claim, that question repetition within a prompt neither significantly improves nor significantly degrades LLM performance, is an empirical finding based on measured accuracies of five models on three external reading-comprehension datasets (SQuAD, HotPotQA, Natural Questions). These accuracies are direct observations of model outputs under different prompt variations, not quantities derived from the paper's own assumptions or fitted to the outcome being claimed. The statistical test in Appendix C.1 (Friedman test with p = 0.70) summarizes the observed accuracy data; it is not a parameter fitted to a subset of that data and then used to predict the same data. The only self-citations appear in background choices: citing Shaier et al. (2024a) for placing context before the question in the open-book setting, and for using long answers as context in Natural Questions. These prompt-construction choices are antecedent to the experiment and do not determine whether repetition helps or hurts; they are not load-bearing for the null result. No uniqueness theorem, imported ansatz, or renaming of a known result is invoked. The limitation that the pooled Friedman test may be underpowered, or that per-cell differences in Table 1 might be heterogeneous, is a legitimate statistical-correctness concern, but it is not a form of circularity. The derivation chain is therefore self-contained with respect to the paper's own conclusions.
Assumptions & free parameters
assumptions (5)
- domain assumption Substring matching is a valid measure of model accuracy.
- domain assumption The 500-question sample per dataset is representative of the full dataset.
- domain assumption The global Friedman test on pooled data is appropriate for detecting repetition effects.
- domain assumption A single forward pass per prompt yields a stable estimate of model accuracy.
- domain assumption Paraphrased questions generated by the model are a valid form of the repetition manipulation.
Cite this review
Pith. "Pith review of Asking Again and Again: Exploring LLM Robustness to Repeated Questions." pith.science (2026). https://pith.science/paper/WBR4YGKP
@misc{pith2026241207923,
author = {Pith},
title = {Pith review of: Asking Again and Again: Exploring LLM Robustness to Repeated Questions},
year = {2026},
howpublished = {\url{https://pith.science/paper/WBR4YGKP}},
note = {Machine review of arXiv:2412.07923}
}
abstract
This study investigates whether repeating questions within prompts influences the performance of large language models (LLMs). We hypothesize that reiterating a question within a single prompt might enhance the model's focus on key elements of the query. We evaluate five recent LLMs -- including GPT-4o-mini, DeepSeek-V3, and smaller open-source models -- on three reading comprehension datasets under different prompt settings, varying question repetition levels (1, 3, or 5 times per prompt). Our results demonstrate that question repetition can increase models' accuracy by up to $6\%$. However, across all models, settings, and datasets, we do not find the result statistically significant. These findings provide insights into prompt design and LLM behavior, suggesting that repetition alone does not significantly impact output quality.
Figures
Forward citations
Cited by 1 Pith paper
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Ask Twice, Look Twice: Prompt Echoing Resolves the Question-First Paradox in Vision-Language Models
Repeating the question on both sides of the image (question echoing) closes the question-first accuracy gap in five open VLMs and beats standard single-pass orderings on several VQA benchmarks.
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Reviewed August 11, 2026 · model on record in the stance chip above.
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