REVIEW 3 major objections 5 minor 21 references
The Jumping Reasoning Curve? Tracking the Evolution of Reasoning Performance in GPT-[n] and o-[n] Models on Multimodal Puzzles
T0 review · 3 major / 5 minor · reviewed 2026-08-09 · deepseek-v4-flash
Pith's one-line read The paper claims that o-series reasoning models, especially o3 and o4-mini, outperform GPT-series models by a wide margin on multimodal puzzle benchmarks, with accuracy rising as reasoning effort increases, while fine-grained perception…
desk verdict A useful capability snapshot with a real contamination blind spot; the o-series 'huge margin' claim is conditional on unseen test items. 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 machinery that carries the argument is the pair of benchmark datasets with predefined ontologies: PuzzleVQA's ten puzzle categories (single-concept and dual-concept) and AlgoPuzzleVQA's eighteen puzzle classes allow failures to be attributed to specific reasoning components. The active mechanism is the progressive bottleneck analysis: starting from a bare image-and-question prompt, the authors add ground-truth visual perception, then ground-truth inductive reasoning, and measure the accuracy gain at each step. That decomposition turns a single benchmark score into separate measurements of perception-limited and induction-limited performance. Evaluation is standardized by using a GPT-4o model to match free-form candidate answers, with a manual check of 200 outputs showing 99% agreement.
What would settle it
Run o4-mini on newly generated PuzzleVQA and AlgoPuzzleVQA instances that follow the same puzzle ontologies but were published after the model's training cutoff; if its accuracy drops to roughly GPT-4.5 levels, the reported o-series advantage is largely memorization, whereas if the gains persist, the paper's scaling claim is supported.
Extended reading notes
Core claim
The central discovery, as the authors state it, is that o-series models consistently outperform GPT-series models by a huge margin on both datasets, and that within the o-series performance scales reliably with increased reasoning modes. The paper shows that o3 and especially o4-mini set new accuracy records on both PuzzleVQA and AlgoPuzzleVQA in multiple-choice and open-ended formats, while the newer GPT models (GPT-4.5, GPT-4.1) improve only marginally over GPT-4o. The same results show persistent ceilings: all models lose substantial accuracy on open-ended questions compared with multiple-choice, and the hardest algorithmic puzzles (Map Colour, Chain Link, Wood Slide) remain near zero for even the best model. A bottleneck experiment injects ground-truth visual descriptions and then ground-truth inductive explanations into the prompt; both injections raise accuracy substantially, leading the paper to conclude that visual perception and inductive reasoning are separate limiting factors, not a single reasoning deficit.
Load-bearing premise
The comparison assumes o3 and o4-mini have not been trained on the public PuzzleVQA and AlgoPuzzleVQA instances, yet the paper reports no contamination check, so part of the reported o-series gains could be memorization rather than reasoning.
Editorial extensions
If this is right
- If the o-series advantage is real, later reasoning models will continue to convert test-time reasoning effort into higher accuracy on multimodal puzzles, so benchmark scores should keep climbing as long as models can spend more time thinking.
- Because open-ended accuracy trails multiple-choice accuracy by roughly 15 to 20 points across models, reported progress depends heavily on evaluation format; multiple-choice scores overstate models' generative reasoning ability.
- The bottleneck analysis implies that improving perception, not just reasoning, is a pre-condition for further progress, since providing perfect visual descriptions lifts even the best model by about ten points on PuzzleVQA.
- Combinatorial and graph-style puzzles (Map Colour, Chain Link, Wood Slide) remain near zero even with higher reasoning effort, marking a class of problems that this scaling approach does not yet solve.
Reading between the lines
- The paper does not report a contamination check, so an immediate extension would be to generate fresh puzzle instances from the same ontologies and rerun o4-mini; the paper's claim predicts the ordering survives, while a memorization explanation predicts a drop.
- The ordering of bottlenecks suggests that making visual perception reliable may produce larger gains than additional test-time compute, a hypothesis the paper itself does not test directly.
- The near-total failures on Map Colour and Chain Link resemble classic combinatorial search problems, implying these benchmarks are probing planning capability rather than reasoning style; that may explain why reasoning effort alone does not move them.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper evaluates seven OpenAI models from the GPT and o series (GPT-4-Turbo, GPT-4o, GPT-4.5, GPT-4.1, o1, o3, and o4-mini) on two multimodal puzzle benchmarks, PuzzleVQA and AlgoPuzzleVQA, in both multiple-choice and open-ended settings. The authors report that o-series models, especially o4-mini, outperform GPT-series models by large margins, that performance improves with increased reasoning effort, and that open-ended evaluation is harder than multiple-choice. They also conduct a bottleneck analysis on PuzzleVQA by injecting ground-truth visual perception and induction explanations, concluding that visual perception and inductive reasoning are the main limiting factors. The datasets and evaluation resources are publicly released on GitHub.
Significance. If the main claims hold, the paper provides a useful measurement of how reasoning-oriented models transfer to multimodal puzzles and where they still fail, with implications for the current debate on reasoning scaling. The paper has several concrete strengths: the comparison spans seven closed models across many task categories, the benchmark is extended to an open-ended format, the GPT-4o-based answer matching was manually validated on 200 samples with 99% agreement, and the data and resources are openly released. However, the headline conclusions are currently conditional on three issues: the scalability claim is contradicted by several rows of the paper's own table, no contamination check is reported for the public benchmark instances, and the bottleneck-injection protocol may leak the answer via the ground-truth explanations. These issues are load-bearing for the paper's central claims, so the contribution cannot be accepted in its present form.
major comments (3)
- [Section 5, Table 1] The claim that 'performance scales reliably with increased reasoning modes' is contradicted by the paper's own data. For example, in multiple-choice PuzzleVQA Shapes, o3 scores are 78.5 (Low), 78.0 (Medium), and 74.0 (High); in AlgoPuzzleVQA Checker Move, o3 scores decrease from 61 to 59 to 56; and in AlgoPuzzleVQA Number Slide, o1 scores are 26 (Low), 88 (Medium), and 27 (High). Many other rows are also non-monotonic. Because the table reports a single run with no confidence intervals or repeated seeds, the statement that 'High variants outperform Medium, which in turn surpass Low' is not supported as written. The authors should either report repeated runs with variance/confidence intervals and a statistical comparison, or substantially qualify the scalability claim in light of these exceptions.
- [Section 3 and Section 5, Table 1] The central comparison assumes that o3 and o4-mini have not seen the public PuzzleVQA and AlgoPuzzleVQA instances during training. Both datasets are fully public in a GitHub repository, and the paper reports no contamination check such as n-gram overlap, membership inference, or evaluation on newly generated held-out variants. Since OpenAI models are trained on web-scale data, memorization could inflate the reported o-series margins, including the headline AlgoPuzzleVQA multiple-choice averages (GPT-4.1: 37.1 vs o4-mini High: 65.4). The Limitations section also does not mention this risk. The performance trend may still survive a contamination check, but the magnitude of the reported gains is not interpretable without one.
- [Section 8, Table 2 and Figure 6] The bottleneck analysis claims that injecting ground-truth visual perception and induction explanations isolates the contribution of each component. However, the induction prompt includes 'an explanation of the underlying pattern within it,' which, together with the ground-truth perception, can be nearly answer-revealing. The observed gains therefore do not cleanly measure inductive reasoning as a separate bottleneck. The conclusion that 'inductive reasoning [is] a separate and significant limiting factor' needs additional controls, such as providing partial or perturbed explanations, withholding the final answer explicitly, or requiring the model to produce the answer from the explanation rather than receiving it implicitly.
minor comments (5)
- [Section 4.1] GPT-4o is used both as an answer grader and as one of the evaluated models; the manual 99% agreement on 200 samples is reassuring, but the paper should state the grader prompt temperature and whether the same samples were checked by multiple annotators.
- [Table 1] The table is very dense and the repeated column headers for reasoning modes make it difficult to read; splitting the table by dataset or adding explicit sub-column rules would improve clarity.
- [Section 7] There is a typo in the phrase 'fundamental difficulty in undestanding the underlying principles'; it should be 'understanding'.
- [Section 2.1] The notation 'O-[n]' is used inconsistently with the rest of the paper, which uses lowercase 'o-[n]'.
- [Section 10] The limitations section is generic and does not mention the two most important threats to the reported conclusions: the lack of a contamination check and the single-run evaluation without variance estimates.
Circularity Check
No material circularity: the paper's claims are external measurements on public benchmarks, with a minor self-citation of the authors' own datasets that is not load-bearing.
full rationale
The paper's central claims are empirical accuracy measurements on two public benchmarks, PuzzleVQA and AlgoPuzzleVQA, rather than a derivation from first principles or from fitted parameters. The comparison between GPT-[n] and o-[n] models is obtained by running closed models on fixed, publicly released test instances and comparing outputs against ground-truth answers. There is no equation that defines a predicted quantity in terms of an input quantity, no parameter fitted to a subset of data and then reported as a prediction, and no formal theorem invoked as a load-bearing premise. The authors do cite their own prior benchmark papers, Chia et al. (2024) for PuzzleVQA and Ghosal et al. (2024) for AlgoPuzzleVQA, and they describe these datasets as 'ideal benchmarks' for the study. This is a self-citation, but it is not circular in the sense used in this analysis: the benchmarks are fixed public artifacts, and the paper's headline result is a measurement on those artifacts, not a claim derived from the benchmarks' construction or from the authors' prior results. The GPT-4o-based answer matching step is also not circular because it is a scoring mechanism for answer extraction, not the target prediction itself, and the authors manually validated it on 200 random samples with 99% agreement. The bottleneck analysis, which injects ground-truth visual perception and inductive reasoning explanations into the prompt, is an ablation rather than a prediction derived from the injected information; it quantifies how performance changes when those components are supplied, and it does not equate the final accuracy with the injected ground truth by construction. The reader's concern about potential training-data contamination of public instances in closed models is a validity and correctness risk affecting the interpretability of the reported gains, but it is not circularity under the definitions adopted here: the paper could be wrong about generalization while still performing a genuine measurement. Overall, the derivation chain is self-contained as an empirical evaluation, with only a minor self-citation of the authors' own benchmark datasets that does not carry the central claim.
Assumptions & free parameters
assumptions (4)
- domain assumption PuzzleVQA and AlgoPuzzleVQA ground-truth labels are correct and the benchmarks are valid proxies for multimodal reasoning ability.
- domain assumption GPT-4o answer matching correctly classifies open-ended responses as correct or incorrect across all models.
- domain assumption The evaluated closed-source models have not memorized the public benchmark instances.
- ad hoc to paper Injecting ground-truth visual perception and induction explanations isolates those components without revealing the final answer.
Cite this review
Pith. "Pith review of The Jumping Reasoning Curve? Tracking the Evolution of Reasoning Performance in GPT-[n] and o-[n] Models on Multimodal Puzzles." pith.science (2026). https://pith.science/paper/UDY2O2BH
@misc{pith2026250201081,
author = {Pith},
title = {Pith review of: The Jumping Reasoning Curve? Tracking the Evolution of Reasoning Performance in GPT-[n] and o-[n] Models on Multimodal Puzzles},
year = {2026},
howpublished = {\url{https://pith.science/paper/UDY2O2BH}},
note = {Machine review of arXiv:2502.01081}
}
read the original abstract
The releases of OpenAI's o-[n] series, such as o1, o3, and o4-mini, mark a significant paradigm shift in Large Language Models towards advanced reasoning capabilities. Notably, models like o3 have demonstrated strong performance on benchmarks like the Abstraction and Reasoning Corpus for Artificial General Intelligence (ARC-AGI). However, this benchmark is limited to symbolic patterns, whereas humans often perceive and reason about multimodal scenarios involving both vision and language data. Thus, there is an urgent need to investigate advanced reasoning capabilities in multimodal tasks. To this end, we track the evolution of the GPT-[n] and o-[n] series models (including o1, o3, and o4-mini) on challenging multimodal puzzles from PuzzleVQA and AlgoPuzzleVQA, which demand fine-grained visual perception. Our results reveal that o-[n] series, particularly later iterations like o3 and o4-mini, significantly outperform the GPT-[n] series and show strong scalability in multimodal reasoning. Nonetheless, despite these substantial advancements and the superior capabilities demonstrated by the o-[n] series, our findings highlight that even these leading models face persistent challenges. Difficulties are particularly evident in tasks requiring precise visual perception, robust compositional reasoning across multiple visual attributes, and solving complex algorithmic or highly combinatorial puzzles, indicating critical areas for future AGI development. We plan to continuously track new models in the series and update our results in this paper accordingly. All resources used in this evaluation are openly available at https://github.com/declare-lab/LLM-PuzzleTest.
Figures
Figures from the paper (13 more)
Reference graph
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Reviewed August 9, 2026 · model on record in the stance chip above.
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