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REVIEW 3 major objections 6 minor 42 references

Large Language Models Still Face Challenges in Multi-Hop Reasoning with External Knowledge

T0 review · 3 major / 6 minor · reviewed 2026-08-11 · deepseek-v4-flash

Pith's one-line read Even with chain-of-thought prompting, GPT-3.5 still fails to reliably select and combine external knowledge, handle non-sequential reasoning structures, or generalise across numbers of hops.

desk verdict A small, honest empirical study confirming GPT-3.5's fragility in multi-hop reasoning; the non-sequential reasoning claim needs better support than the depth-length proxy. read the letter →

arxiv 2412.08317 v1 pith:36KCCMXI submitted 2024-12-11 cs.CL

classification cs.CL
keywords multi-hopreasoningChain-of-Thoughtpromptingexternalknowledgecounterfactualnon-sequentialleast-to-mostGPT-3.5generalization
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 argues that even the best-known prompting technique, chain-of-thought, does not give large language models reliable multi-hop reasoning when the knowledge must come from outside the model. Using GPT-3.5 on four reasoning benchmarks, it shows that the model often cannot pick out the right knowledge pieces, gets confused when that knowledge contradicts what it learned during pretraining, fails to build correct reasoning chains when the reasoning structure is non-sequential, and cannot generalise from seeing few-hop examples to many-hop questions. If true, the result matters because it locates the bottleneck not in the language model's factual memory but in the composition step: combining separate pieces of evidence into a sound argument. The paper concludes that current LLMs still show a large gap with human reasoning on these tasks.

What carries the argument

The central mechanism under test is chain-of-thought (CoT) prompting, the few-shot instruction that asks the model to write out intermediate steps before the final answer, together with its variant least-to-most prompting, which inserts an explicit decomposition stage. The paper probes this mechanism with four benchmarks that isolate different sub-skills: HotpotQA for selecting two disjoint evidence pieces, EntailmentBank for composing many steps including non-sequential entailment trees, QASC for two-hop answer composition with distractors, and bAbI15 for unanswerable (non-deductive) cases. The key diagnostic object is the 'entailment tree' from EntailmentBank, whose depth versus path length is used to label a reasoning problem as non-sequential, and the paper also uses counterfactual knowledge swaps in QASC and bAbI15 to test how the model separates external from internal knowledge.

What would settle it

Take the EntailmentBank samples the paper labels non-sequential (depth differs from length), have independent human annotators judge whether the reasoning is genuinely non-sequential, and compare GPT-3.5's accuracy on those against a matched set of sequential samples of equal proof length; if most labelled samples are judged sequential, or if a newer model with explicit non-sequential prompting shows no accuracy gap, the central claim is refuted.

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Extended reading notes

Core claim

The paper's central claim is that LLMs 'still suffer from severe drawbacks' in multi-hop reasoning with external knowledge even when prompted with chain-of-thought (CoT) and its variations. Concretely, four sets of experiments on HotpotQA, EntailmentBank, QASC and bAbI15 with text-davinci-002 show: internal knowledge alone gives low accuracy; adding external knowledge helps but the model rapidly loses the ability to select all gold knowledge as distractors increase; counterfactual knowledge causes the model to retreat to its pretraining knowledge or to the prompt's format, producing answers like 'not mentioned' far too rarely; on samples the paper classifies as non-sequential (where entailment-tree depth and path length differ), accuracy drops to 56% versus 78% on sequential samples and none of the generated reasoning paths is correct; and least-to-most prompting does not transfer across hop counts, with overall accuracy falling as the exemplars' hop count rises.

Load-bearing premise

The paper's classification of a reasoning problem as 'non-sequential' rests entirely on the criterion that the depth and the length of its entailment tree differ; if that proxy does not actually capture non-sequential structure, the claim that chain-of-thought fails on non-sequential reasoning is unsupported.

Editorial extensions

If this is right

  • With only internal knowledge, GPT-3.5 scores 40% on HotpotQA and 35% on EntailmentBank, so multi-hop benchmarks cannot be treated as tests of parametric knowledge alone.
  • Adding distractor-free external knowledge raises accuracy substantially, but the selection step degrades quickly: exact-match selection of both gold paragraphs in HotpotQA falls from 100% to 66% when only 20% of the context is gold.
  • Counterfactual context does not make the model reason counterfactually: it tends to hallucinate the factual knowledge it pretrained on, or to copy the prompt's format, and it fails most unanswerable (non-deductive) bAbI15 items.
  • On non-sequential entailment samples (depth differs from path length), accuracy is 56% and no generated proof is correct, whereas sequential samples reach 78%.
  • Least-to-most prompting does not generalise across hop counts: overall accuracy drops as the exemplars' hop count rises, and the model over-decomposes or mis-decomposes questions even when the final answer is right.

Reading between the lines

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

  • If the same pattern holds on later and larger models, the bottleneck would look like a property of CoT-style prompting itself rather than of one checkpoint; an easy test is to rerun the non-sequential and counterfactual settings on newer models and on open-weight models.
  • The depth-versus-length criterion could be validated against human judgments of non-sequential structure; if the proxy over- or under-selects examples, the 56% versus 78% gap may be partly a labelling artefact rather than a genuine reasoning deficit.
  • The counterfactual results suggest a practical recipe for making models more robust: teach them when to trust the context over parametric memory by mixing counterfactual exemplars or by adding explicit instructions to follow the context even when it contradicts pretraining, an extension the paper does not test.
  • The shortcut analysis (accuracy above exact-match in the 20% setting) implies that benchmark scores on HotpotQA-style tasks can overstate true multi-hop ability, so future benchmarks should report per-sample evidence that both hops were actually used.
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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

3 major / 6 minor

Summary. This paper reports experiments with text-davinci-002 on four multi-hop reasoning benchmarks (HotpotQA, EntailmentBank, QASC, bAbI15) under Chain-of-Thought prompting and its variants. The experiments manipulate the availability of external knowledge, the proportion of distractor sentences, the factual consistency of the provided knowledge, the structural type of reasoning (sequential/non-sequential), and the number of hops in the prompt exemplars. The central empirical claims are that external knowledge helps but distractors and counterfactual knowledge confuse the model, that accuracy drops on selected non-sequential entailment samples, and that least-to-most prompting does not improve hop-count generalization.

Significance. If the results hold, this is a useful negative result: it documents that knowledge selection, counterfactual robustness, and non-sequential reasoning remain weak points for CoT-prompted LLMs, consistent with but more comprehensive than existing findings. The study's strengths are its four-benchmark coverage, the transparent prompt templates in the appendix, and the manual error analysis that identifies specific failure modes such as word bias and hallucination. However, the paper's quantitative support is currently limited by small single-model samples and by an unvalidated structural proxy, so the contribution is exploratory and would need robustness work to serve as a definitive claim.

major comments (3)
  1. [Section 5, 'Reasoning in Non-Sequential Cases'] The paper identifies 'non-sequential' samples by the criterion that 'depth and length of the entailment tree are not the same.' This criterion is not validated, and the two groups may differ in proof length, number of premises, or answer complexity rather than in structural non-sequentiality alone. The reported accuracy gap (56% vs. 78%) is therefore not unambiguously attributable to non-sequential reasoning. Please provide a validation of the proxy (e.g., human-annotated structural labels, matched control sets, or an analysis showing that proof length is not a confound); the examples in Appendix A.2 illustrate the intended phenomenon but do not establish that the criterion separates the classes reliably across the dataset.
  2. [Section 3 and Tables 2-6] Every experiment uses 100 test samples and a single model (text-davinci-002), with no confidence intervals, bootstrap estimates, or significance tests, and the sampling procedure for the 100 samples is not described. Differences such as 83% vs. 74% in Table 2 and 64% vs. 46% in Table 6 could be within sampling noise, especially because decoding is stochastic and correctness is checked manually. The abstract's plural 'LLMs' claim also goes beyond the single evaluated model. Please add uncertainty quantification and either replicate on at least one other model or restrict the claims to GPT-3.5 as evaluated here.
  3. [Section 5 and Footnote 1] The manual evaluation is not sufficiently specified to be reproducible. The paper reports that 'we check each sample manually' and that 'none of the generated reasoning paths is correct' in the non-sequential experiment, but no annotation protocol, error taxonomy, second annotator, inter-annotator agreement, or released annotations are provided. This matters because the qualitative conclusions about error types and about the absence of coherent reasoning paths carry as much weight as the accuracy numbers. Please make the rubric and the per-sample annotations available.
minor comments (6)
  1. [Section 3] Clarify whether text-davinci-002 is the GPT-3.5 model referenced in the abstract, since the naming is potentially confusing.
  2. [Section 5] Define 'depth' and 'length' of an entailment tree explicitly; these terms are used without formal definitions.
  3. [Table 5] The second value in each cell is a raw count (out of 50) rather than a percentage, while the first value is a percentage; this mixed format makes the table hard to read.
  4. [Appendix A.2] There are typos in the prompts ('posive', 'lind', 'invisble') that should be corrected.
  5. [Section 6 and Figure 2] The figure caption does not state the number of generated reasoning paths per setting, which makes the length distributions hard to interpret.
  6. [General] The paper would benefit from a brief statement on data and code availability; the appendices provide prompts but not the test subsets or evaluation code.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the paper is an empirical benchmark study with externally measured results, no fitted parameters, and no load-bearing self-citation chain.

full rationale

This paper does not present a derivation chain in which conclusions are equivalent to inputs by construction. All headline claims are empirical measurements of GPT-3.5 performance on external benchmarks (HotpotQA, EntailmentBank, QASC, bAbI15) under specific prompting conditions. There are no fitted parameters, no internal equations that define the target result, and no self-citations invoked to forbid alternatives or justify a choice. The authors' operational decisions, such as defining non-sequential reasoning samples in Section 5 as those where 'depth and length of the entailment tree are not the same,' are choices of experimental design and measurement. The resulting accuracy comparison (56% vs 78%) is an external empirical observation on that defined subset, not a statement that is true by definition. Whether that proxy validly captures non-sequential reasoning is a validity or correctness concern, not a circularity concern, and the paper itself does not claim the proxy is derived from first principles. Similarly, the counterfactual-knowledge and hop-generalization experiments compare model outputs against dataset ground truths and prior published results; the conclusions are not forced by the prompts or by any fitted quantity. The absence of any identified circular step warrants a score of 0.

Assumptions & free parameters 0 free parameters · 4 assumptions · 0 invented entities

No free parameters are fitted, and no new entities are introduced. The paper's conclusions rest on four domain assumptions: benchmark validity, CoT as the proper probe, the operationalization of non-sequential reasoning (ad hoc), and the reliability of manual scoring.

assumptions (4)
  • domain assumption The four benchmarks (HotpotQA, EntailmentBank, QASC, bAbI15) are valid and informative measures of multi-hop reasoning ability.
    The paper uses these benchmarks as ground truth for reasoning capability without questioning whether dataset biases (e.g., shortcuts in HotpotQA, which the paper itself notes) distort the measurement.
  • domain assumption Chain-of-Thought prompting and its variations are the appropriate way to elicit and evaluate reasoning in LLMs.
    The paper assumes that failures under CoT indicate reasoning limitations rather than prompt sensitivity or format issues.
  • ad hoc to paper The criterion in Section 5 that non-sequential samples have depth and length of the entailment tree that differ is a valid proxy for non-sequential reasoning.
    The paper selects non-sequential samples using this operationalization but provides no validation that it matches the intuitive notion of non-sequential reasoning.
  • domain assumption Manual evaluation by the author is a reliable measure of answer correctness.
    The paper states 'We check each sample manually and consider the answer as correct if it has the same meaning as the ground truth,' without inter-annotator agreement or a scoring rubric.

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Cite this review

Pith. "Pith review of Large Language Models Still Face Challenges in Multi-Hop Reasoning with External Knowledge." pith.science (2026). https://pith.science/paper/36KCCMXI

@misc{pith2026241208317,
  author       = {Pith},
  title        = {Pith review of: Large Language Models Still Face Challenges in Multi-Hop Reasoning with External Knowledge},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/36KCCMXI}},
  note         = {Machine review of arXiv:2412.08317}
}
read the original abstract

We carry out a series of experiments to test large language models' multi-hop reasoning ability from three aspects: selecting and combining external knowledge, dealing with non-sequential reasoning tasks and generalising to data samples with larger numbers of hops. We test the GPT-3.5 model on four reasoning benchmarks with Chain-of-Thought prompting (and its variations). Our results reveal that despite the amazing performance achieved by large language models on various reasoning tasks, models still suffer from severe drawbacks which shows a large gap with humans.

Figures

Figures reproduced from arXiv: 2412.08317 by the authors.

Figure 1
Figure 1. Two examples on HotpotQA and EntailmentBank respectively where providing external knowledge helps the [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Distribution of length of proof of generated reasoning paths in different settings. X-axis indicates the lengths [PITH_FULL_IMAGE:figures/full_fig_p008_2.png] view at source ↗

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