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MATH-Perturb: Benchmarking LLMs' Math Reasoning Abilities against Hard Perturbations

T0 review · 4 major / 5 minor · reviewed 2026-08-08 · deepseek-v4-flash

Pith's one-line read All 18 tested LLMs drop 10-25% on minimal math edits that force a different solution method; many failures are a new form of memorization—applying learned techniques without checking if they apply.

desk verdict A genuinely new benchmark for hard perturbations with a real failure mode, but the memorization label outruns the evidence. read the letter →

arxiv 2502.06453 v2 pith:7MRDW5W4 submitted 2025-02-10 cs.LG cs.AIcs.CL

classification cs.LGcs.AIcs.CL
keywords MATH-PerturbhardperturbationssimplemathematicalreasoningmemorizationLLMevaluationchain-of-thoughtout-of-distributiongeneralization
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper asks whether high LLM scores on math benchmarks reflect genuine reasoning or memorization of solution patterns. To test this, the authors construct two perturbed versions of 279 hardest (level-5) MATH problems: MATH-P-Simple, where surface details change but the solution method is identical, and MATH-P-Hard, where a minimal edit forces a different solution method. Every one of the 18 models evaluated, including o1-mini and Gemini-2.0-flash-thinking, scores substantially lower on MATH-P-Hard, with drops around 10-25%. Manual error analysis leads the authors to a new form of memorization: models apply trained solution techniques without checking whether the modified setting still permits them, and giving the original problem as an in-context example can make this worse. If this is right, current benchmark scores overstate reasoning robustness, and hard-perturbation generalization will be the next bottleneck.

What carries the argument

The load-bearing mechanism is the paired perturbation design: for each seed problem, MATH-P-Simple and MATH-P-Hard are generated from the same original with minimal edits and guaranteed changed answers, and expert annotators enforce that a hard perturbation cannot be solved by the original method and instead requires deeper understanding. This pairing makes the Original-versus-Simple-versus-Hard comparison a controlled probe: Simple controls for surface-form sensitivity, while Hard isolates whether the model detects that the solution pattern has changed. The failure-mode analysis and the in-context-learning experiment are the instruments that convert the accuracy drop into evidence of method memorization, with the ICL decomposition into helpful versus misleading effects quantifying how demonstrations can entrench the memorized pattern.

What would settle it

Ask a fresh panel of experts to independently re-classify all 279 MATH-P-Hard items as either 'same method' or 'different method' relative to the original, and check whether the MATH-P-Hard accuracy drop concentrates on items with high agreement; low agreement would make difficulty, not memorization, the more parsimonious explanation.

Watch

Extended reading notes

Core claim

The paper's central claim is that LLMs' mathematical reasoning is substantially biased toward the distribution of solution patterns seen in training, and that this bias shows up as a new form of memorization. On MATH-P-Hard, problems that differ from the original by a minimal edit but require a different, often deeper solution method, all evaluated models show large accuracy drops even though the same models solve the simple-perturbation versions nearly as well as the originals. Manual inspection of failures shows models ignoring the modified assumptions, blindly applying the original technique, and sometimes even outputting the original answer rather than the changed one. The authors estimate that for strong models such as o1-mini and Claude-3.5-Sonnet, memorization-type errors account for 40% and 25% of the errors respectively. They also find that one-shot in-context learning with the original problem and solution has a misleading effect on MATH-P-Hard that cancels much of its benefit, and they conclude that robustness to hard perturbations, not average accuracy on familiar problems, is the key missing capability.

Load-bearing premise

The load-bearing premise is that the expert annotators were right that every MATH-P-Hard item truly requires a different solution method than the original, because if a hard item is just a harder instance of the same method the observed drop could be plain difficulty rather than memorization.

Editorial extensions

If this is right

  • Every tested model, including the strongest reasoning models, loses roughly 10-25% on MATH-P-Hard, so high average accuracy on the original MATH set coexists with systematic fragility when the required method changes.
  • Robustness to simple perturbations has improved since earlier functional benchmarks, but that improvement does not transfer to hard perturbations, meaning progress on average-case math is not the same as method-shift generalization.
  • One-shot in-context learning with the original problem and solution helps on MATH-P-Simple but can mislead models on MATH-P-Hard, and for several large models the misleading effect nearly cancels the demonstration's benefit.
  • Because in-context learning is a form of test-time training, the paper predicts that naive fine-tuning on a narrow distribution of problem settings will hurt hard-perturbation generalization.
  • Hard-perturbation robustness should be tracked as a separate evaluation axis rather than folded into average accuracy.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • A direct testable extension is that an explicit verification step, asking the model to check whether the original solution method still applies before solving, should recover a large fraction of the MATH-P-Hard losses; this can be measured on the released benchmark without new annotation.
  • The paired simple/hard design transfers to code and science reasoning: changing one condition that invalidates a standard algorithm should produce a similar accuracy cliff, which would show the phenomenon is not specific to math word problems.
  • A stronger memorization test would compare the hard-perturbation drop against difficulty-matched control problems that share no training-distribution ancestor; if the drop disappears, the bias is toward learned solution patterns rather than toward easy problems.
  • If hard perturbations enter routine evaluation, published accuracies on MATH-style benchmarks would fall substantially, reframing how much 'reasoning' current models display.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 5 minor

Summary. The paper introduces MATH-Perturb, a benchmark consisting of 279 problems derived from level-5 MATH problems, each with a simple perturbation (MATH-P-Simple, same solution method) and a hard perturbation (MATH-P-Hard, intended to require a different solution method). The authors evaluate 18 LLMs under zero-shot chain-of-thought and report consistent accuracy drops on MATH-P-Hard (10–25% for the strongest models), with smaller drops on MATH-P-Simple. They further analyze failure modes and argue that a substantial fraction of errors stem from a 'new form of memorization' in which models blindly apply solution techniques from the original problem without adapting to the modified conditions. They also study the effect of using the original problem as an in-context learning demonstration, showing that the misleading effect partially offsets the ICL benefit on MATH-P-Hard.

Significance. If the benchmark and its interpretation hold, the paper makes a useful contribution: a curated, human-validated stress test that goes beyond prior simple-perturbation benchmarks (e.g., Functional MATH) by requiring a genuine change of solution method. The accuracy drops on frontier models are striking and likely to motivate further work on out-of-distribution reasoning. The paper also ships useful auxiliary analyses: the train/test split of the seed problems, the retrieval-based MRR check showing that original problems are easily retrieved, and the ICL ablation with random examples. However, the central mechanistic claim—that failures indicate a new form of memorization of problem-solving techniques—is not yet adequately supported by the evidence presented.

major comments (4)
  1. [§3.2] The quantitative support for the paper's central mechanistic claim is thin. The memorization estimates (40% for o1-mini, 25% for Claude-3.5-Sonnet) come from manual inspection of only 20 error cases per model, for two models, with no inter-annotator agreement, no blinded protocol, and no confidence intervals. The sentence in §3.2 that these issues are 'often coupled with other types of errors' further weakens the attribution. To claim that memorization is 'pervasive among the models we evaluated,' the authors should either expand the manual analysis to more models and more errors, or report a validated coding scheme with agreement statistics.
  2. [§2, Annotation Criterion] The fundamental distinction between MATH-P-Simple and MATH-P-Hard rests on the annotators' expert judgment that a hard perturbation 'cannot be solved using the same method as the original problem.' Yet the paper reports no inter-annotator reliability for this criterion, and Appendix C.1 itself notes a 'misalignment between the models' capabilities and the annotators' perception of the difficulties of math problems.' Because this criterion is the premise for interpreting the accuracy drop as evidence of method-change rather than generic difficulty, the paper needs an explicit validation study (e.g., independent re-annotation, or a check that the original solution method fails on MATH-P-Hard items).
  3. [§3.1, Table 1] The headline accuracy drops on MATH-P-Hard are clear, but the interpretation that they reflect bias toward the original reasoning patterns is underdetermined. MATH-P-Simple is a same-method control, not a difficulty-matched control: by construction it is close to the original and easy. A harder but same-method perturbation baseline is needed to attribute the 10–25% drops to the method change per se rather than to the increased difficulty of MATH-P-Hard. Without such a control, the accuracy data alone cannot distinguish the authors' memorization hypothesis from the generic claim that these models are weaker on harder problems.
  4. [§3.1, Table 1; §3.4, Table 7] The paper reports single-run accuracies without confidence intervals or significance tests. With only 279 items, a 5% difference corresponds to roughly 14 problems, and many train/test or model-to-model differences in Table 1 are of this size; the claim of 'significant performance drops' is therefore not statistically established. Similar caution applies to the ICL decomposition in Table 7, where the n(correct→wrong) and n(wrong→correct) counts are small; a bootstrap or per-item significance analysis would be appropriate.
minor comments (5)
  1. [Abstract] Fix the citation typo 'Hendrycksmath et. al.' to 'Hendrycks et al.'.
  2. [§3.4] The sentence 'in Table 7 and Figure 7, and we calculate' contains a stray 'and'; it should be 'in Table 7 and Figure 7, we calculate'.
  3. [Appendix A] The model name 'Mathtral' should be spelled 'Mathstral'.
  4. [§3, Evaluation Setting] For reproducibility, the paper should state the exact zero-shot CoT prompt used and the decoding settings (temperature, top-p, max tokens), as these details are not currently specified.
  5. [General] The paper should include a link to the released benchmark (data, annotation guidelines, and evaluation code) if available, as the benchmark is the primary artifact of the manuscript.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: the benchmark accuracies are measured against external human-annotated ground truth, and the memorization interpretation is an empirical claim rather than a fitted or self-referential derivation.

full rationale

The paper's central measurements—accuracy on Original, MATH-P-Simple, and MATH-P-Hard—are direct evaluations against held-out, externally curated ground-truth answers from the MATH dataset, with answers checked by an independent equivalence checker. No parameter is fitted to the test outcomes and then renamed as a prediction; the only 'prediction' is the observed performance drop, which is measured, not derived from the benchmark's construction. The hard-perturbation criterion ('the modified problem cannot be solved using the same method as the original problem') is an annotator judgment used to design the benchmark, not a constraint imposed on the models' outputs, so the accuracy drop cannot reduce to the definition of the benchmark by construction. The failure-mode analysis that identifies 'memorization' is a manual, interpretive labeling of error cases; whether that interpretation is fully supported is a validity or correctness concern, not a circularity, because the labels are not derived from the benchmark's definitions. The self-citations in the related-work section (e.g., prior memorization work by some of the same authors) are background references and are not load-bearing for any argument in the paper. The paper is self-contained in its evaluation against external benchmarks, and no circular step can be exhibited from the text.

Assumptions & free parameters 0 free parameters · 3 assumptions · 0 invented entities

No parameters were fitted and no entities were introduced. The benchmark depends on judgement-based categorization and on the evaluation pipeline.

assumptions (3)
  • domain assumption The MATH dataset's level-5 problems and their official answers are correct.
    Used as seeds and ground truth in Section 2; if the source answers are wrong, the benchmark answers inherit the error.
  • ad hoc to paper Annotators can reliably determine whether a modified problem can be solved by the same method as the original.
    This is the defining criterion for MATH-P-Hard versus MATH-P-Simple in Section 2, and it is not formalized or externally validated.
  • domain assumption Zero-shot chain-of-thought with the sympy equivalence checker is a valid measure of model accuracy on these problems.
    Section 3 Evaluation Setting; no reliability analysis, repeated sampling, or human verification of all judged answers is reported.

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Cite this review

Pith. "Pith review of MATH-Perturb: Benchmarking LLMs' Math Reasoning Abilities against Hard Perturbations." pith.science (2026). https://pith.science/paper/7MRDW5W4

@misc{pith2026250206453,
  author       = {Pith},
  title        = {Pith review of: MATH-Perturb: Benchmarking LLMs' Math Reasoning Abilities against Hard Perturbations},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/7MRDW5W4}},
  note         = {Machine review of arXiv:2502.06453}
}
read the original abstract

Large language models have demonstrated impressive performance on challenging mathematical reasoning tasks, which has triggered the discussion of whether the performance is achieved by true reasoning capability or memorization. To investigate this question, prior work has constructed mathematical benchmarks when questions undergo simple perturbations -- modifications that still preserve the underlying reasoning patterns of the solutions. However, no work has explored hard perturbations, which fundamentally change the nature of the problem so that the original solution steps do not apply. To bridge the gap, we construct MATH-P-Simple and MATH-P-Hard via simple perturbation and hard perturbation, respectively. Each consists of 279 perturbed math problems derived from level-5 (hardest) problems in the MATH dataset (Hendrycksmath et. al., 2021). We observe significant performance drops on MATH-P-Hard across various models, including o1-mini (-16.49%) and gemini-2.0-flash-thinking (-12.9%). We also raise concerns about a novel form of memorization where models blindly apply learned problem-solving skills without assessing their applicability to modified contexts. This issue is amplified when using original problems for in-context learning. We call for research efforts to address this challenge, which is critical for developing more robust and reliable reasoning models.

Figures

Figures reproduced from arXiv: 2502.06453 by the authors.

Figure 1
Figure 1. Left: The overview of MATH-Perturb Benchmark. Right: An example of the original problem, its simple perturbation, its hard perturbation, and the corresponding model responses that overfit the short-cut solution. The simple perturbation to the problem is non-essential, so the modified problem can be solved using the same method as the original problem. The hard perturbation changes the problem fundamentally and it re… view at source ↗
Figure 2
Figure 2. Performance on MATH-P-Simple, MATH-P-Hard, and the corresponding Original problems. We observe performance degrada￾tions across all models on MATH-P-Hard. 2. Dataset Curation Origin of the Dataset. We choose the popular MATH benchmark (Hendrycks et al., 2021), which contains chal￾lenging mathematical reasoning problems sourced from American high school mathematics competitions such as the AMC 10, AMC 12, and AIME. E… view at source ↗
Figure 3
Figure 3. Illustration of the annotation process for MATH-P-Simple and MATH-P-Hard. text-embedding-3-large embedding model. The distribu￾tions of the normalized edit distance and the cosine similari￾ties are shown in [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figures from the paper (6 more)
Figure 4
Figure 4. Figure 4: The distributions of edit distances and cosine similarities of embeddings between the perturbed problems and the origi￾nal problems. The edit distances are normalized by the lengths of the original problems. The embedding model is OpenAI’s text-embedding-3-large. We al…
Figure 5
Figure 5. Figure 5: An example of memorization coupled with incorrect reasoning: The model incorrectly reduces the modified condition to the original condition, and then follows the original reasoning pattern. The correct answer is 1/36 . We manually performed 20 repeated trials and found…
Figure 6
Figure 6. Figure 6: An example of memorizing the desired outcome. The model outputs all integer values instead of the smallest integer value. The correct answer is 10 . We manually performed 20 repeated trials and found that o1-mini has a pass rate of 75%. All the 25% errors are due to th…
Figure 7
Figure 7. Figure 7: The error rates (%) of the models without and with the original problem and solution as the in-context learning (ICL) example. For MATH-P-Hard, we decompose the influences of in-context learning into ICL effect (the down arrow ↓), which reduces the error rates, and mis…
Figure 8
Figure 8. Figure 8: The error rates (%) of the models without and with the original problem and solution as the in-context learning (ICL) example. For MATH-P-Hard, we decompose the influences of in-context learning into ICL effect (the down arrow ↓), which reduces the error rates, and mis…
Figure 9
Figure 9. Figure 9: The effect of scaling up inference-time compute. We report pass@k and self-consistency (SC) accuracies for different numbers of solutions k. 19 [PITH_FULL_IMAGE:figures/full_fig_p019_9.png]

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Pith tools

Reviewed August 8, 2026 · model on record in the stance chip above.