REVIEW 3 major objections 6 minor 2 cited by
Cross-Modal Consistency in Multimodal Large Language Models
T0 review · 3 major / 6 minor · reviewed 2026-08-12 · deepseek-v4-flash
Pith's one-line read GPT-4V is cross-modally inconsistent: for task instances carrying the same information, its output depends on whether the input is text or image.
desk verdict Useful formalization of cross-modal consistency with a robust but thinly evidenced GPT-4V finding; deserves peer review with revisions. 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 framework rests on the notion of an information-preserving converter $K^q_{a,b}$ between modalities, and on the consistency score $C_t$ that measures how often outputs agree across converted pairs. The authors build parallel datasets for seven tasks using OCR with human verification for image-to-text conversion and rendered screenshots for text-to-image conversion, selecting tasks where they argue the conversion preserves all task-relevant information. The Vision-Depicting-Prompting (VDP) method is the corrective mechanism: it first asks the model to transcribe the image into text, then answers with both the transcription and the original image, exploiting the model's stronger text-side reasoning.
What would settle it
Run the seven parallel tasks on a fresh GPT-4V session with the same converters and manually verified conversions; if image-mode accuracy on Table Understanding and MMLU matches text-mode accuracy, or the consistency score $C_t$ exceeds 0.95 across tasks, then the reported cross-modal inconsistency would fail to replicate and the claim would be withdrawn.
Extended reading notes
Core claim
The central discovery is that GPT-4V is cross-modally inconsistent as formalized by the paper's consistency score $C_t = \frac{1}{n}\sum_i c_i^M$, the fraction of paired instances where the model's answer is identical under text and image input. Table 1 reports large image-mode accuracy drops on all seven tasks, including Table Understanding (0.93 text vs 0.03 image) and MMLU (1.00 vs 0.74), while a one-step OCR ablation shows near-perfect extraction on LogicQA, MMLU, and Table Understanding. Because the information in the image is available to the model, the authors attribute the gap to the model's internal reasoning processes differing by modality rather than to failed perception. The Vision-Depicting-Prompting results support the same interpretation: having the model first describe the image in text raises image-mode accuracy by up to 57 percentage points on understanding tasks and substantially increases consistency.
Load-bearing premise
The measured gaps rest on the assumption that the converters—OCR with human verification and rendered screenshots—preserve all task-relevant information, including layout, for every one of the seven tasks; the authors concede in the Limitations section that lossless conversion is not generally available, so a conversion artifact could mimic a true inconsistency.
Editorial extensions
If this is right
- Users of GPT-4V should expect markedly worse answers on image-only inputs than on equivalent text inputs, especially for table and reading-comprehension tasks.
- Cross-modal consistency should be reported alongside per-modality accuracy, since a model can score well in each modality taken alone yet be unreliable across them.
- For tasks where OCR is nearly perfect, the bottleneck is not visual information extraction but modality-specific reasoning, so improving visual reasoning is the targeted next step.
- VDP-style prompting is a practical workaround: on Table Understanding it raises image accuracy from 0.03 to 0.93 and consistency from 0.10 to 0.90.
Reading between the lines
- The same converter-based consistency test could be applied to other multimodal models to determine whether a language-side bias is specific to GPT-4V or a general property of vision-language alignment.
- If the bias is architectural, then input modality becomes a reliability surface: the same prompt could yield different factual behavior depending on whether it is delivered as text or as a screenshot.
- A natural extension is to use consistency scores as a training objective or as a diagnostic signal for modality-invariant representations.
- The framework could be extended to audio or video modalities whenever an information-preserving converter exists, testing whether the language-dominant pattern generalizes.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper defines cross-modal consistency for multimodal LLMs as output invariance under information-preserving modality conversion (Eq. 1), constructs parallel text-image datasets for seven tasks, evaluates GPT-4V on 50 instances per task, and reports substantial accuracy drops when input is presented as an image rather than text (e.g., Table Understanding 0.93 to 0.03, MMLU 1.00 to 0.74). It also proposes a Vision-Depicting-Prompting (VDP) method that extracts a textual description of the image before answering, which partially recovers the image-mode deficit and improves consistency scores. The central conclusion is that GPT-4V exhibits language-dominant, modality-dependent internal reasoning, rather than a unified multimodal understanding.
Significance. If the result is sound, the paper makes a useful contribution by formalizing a cross-modal consistency metric and providing a concrete evaluation framework. The dataset release (promised but not yet available) and the VDP method are potentially valuable. The paper is honest about the difficulty of information-preserving conversion and explicitly acknowledges limitations. However, the strength of the central claim depends on two premises: that the converters preserve all task-relevant information (including layout), and that the 50-instance subsets are representative. Both premises are currently insufficiently supported, so the evidence for 'solely internal reasoning' remains incomplete.
major comments (3)
- [Section 5.4, Tables 2-3] The ablation study does not rule out perceptual failure as the source of the image deficit. For Table Understanding, an OCR accuracy of 1.00 only shows that the model can transcribe the numbers; the task also requires locating row/column positions in the rendered image, which the OCR check does not verify. The conditional consistency scores in Table 3 are consistency rates, not conditional accuracies, so they cannot isolate whether the gap stems from failed spatial perception or from modality-dependent reasoning. The claim that the gap 'can be attributed solely to the model's internal reasoning processes' (Section 5.4) is therefore not supported by the reported evidence.
- [Section 5.2, Table 1] The evaluation uses 50 randomly selected instances per task with no confidence intervals, significance tests, or released data. The MMLU text accuracy of 1.00 suggests the sampled split is unusually easy and may not be representative. With n=50, the 95% confidence interval for a proportion is roughly ±0.14, so the 'sizeable decrease' threshold of 10% is within the noise band for several tasks. The paper should report bootstrap or exact confidence intervals and make the sampled instances public to substantiate the cross-task generalization claim.
- [Sections 3 and 4.1, Limitations] The information-preservation assumption is load-bearing for the entire framework, yet the Limitations section acknowledges that lossless conversion is not generally available. For Math Equation Solving, the OCR accuracy is only 0.68-0.76 (Table 2), so the converter demonstrably does not preserve information for a substantial fraction of instances. The conditional consistency analysis in Table 3 does not report task accuracy on the subset with correct OCR, so it cannot separate conversion artifacts from genuine cross-modal inconsistency. The authors should report image accuracy and text accuracy on the same subset of instances where OCR is verified correct, to establish that the gap persists even when information is actually preserved.
minor comments (6)
- [Figure 1] The figure label 'T ext' should read 'Text'; the figure is also not referenced in the body text before it appears.
- [Section 3] The notation for the converter is inconsistent: K^q_{a,b} is used in the formal definition, but K_{a,b} appears in Section 4.1. Clarify whether the converter is query-dependent in all uses.
- [Section 5.4] The statement that 'OCR accuracy approaches nearly 100% for all instances of LogicQA, MMLU, and Table Understanding tasks' should specify that this refers to the 50-image subsets used in the experiments, not the full source datasets.
- [Appendix A and B] The text versions of math equations contain unrendered LaTeX (e.g., 'x ˆ 2', '$$2x + 4 = |-17 + 3|$$'), which makes the appendix difficult to read; the intended rendered formulas should be shown.
- [Section 5.2] The paper states that 'our results are manually collected for pairwise data instances,' but no inter-annotator agreement or verification protocol is described; at least a brief description would strengthen reproducibility.
- [Ethical Consideration] The ethical consideration paragraph is generic and does not discuss the specific ethical implications of reporting consistency failures in a commercial model or the potential for misuse of the VDP method; this is a presentation issue rather than a technical one.
Circularity Check
No significant circularity: cross-modal consistency is measured directly, not derived from its definition.
full rationale
The paper's central quantity is Eq. (1), an invariance definition: a model is consistent if its outputs agree on information-preserving modality-converted instances. This definition imposes no constraint on GPT-4V's actual outputs, so the reported inconsistencies are empirical findings obtained by directly querying the model on parallel text/image instances. The result therefore carries independent content and is not forced by construction. The only self-citation (Zhang et al. 2023b) motivates the framework by analogy to cross-lingual consistency and is not load-bearing for the GPT-4V measurement; it is not used as a uniqueness theorem or to forbid alternatives. The information-preserving converter assumption is a validity condition for interpreting the measurements, not a step that makes the conclusion true by definition; the paper's own Limitations explicitly concede that lossless conversion is not generally available, which is an honest statement of scope rather than a circular move. VDP is a post-hoc prompting intervention designed from the observed image/text gap and then evaluated on the same tasks; this is a normal empirical loop, not a prediction that reduces to its own inputs. No fitted parameter is renamed as a prediction, and no ansatz is smuggled in via self-citation. Thus the derivation chain is self-contained and the measured cross-modal inconsistency stands as an independent empirical claim.
Assumptions & free parameters
free parameters (1)
- Performance-gap threshold for 'sizeable decrease' =
10%
assumptions (3)
- domain assumption Existence of an information-preserving converter K_q(a,b) for each task, and that OCR-plus-human-verification and screenshot converters instantiate it losslessly for the chosen tasks.
- domain assumption Exact string equality of model outputs is a valid operationalization of answer agreement.
- domain assumption The 50-instance random subsets are representative of each source dataset, and low decoding temperature makes pairwise comparisons stable.
invented entities (2)
-
Cross-modal consistency (formal definition)
-
Vision-Depicting-Prompting (VDP)
Cite this review
Pith. "Pith review of Cross-Modal Consistency in Multimodal Large Language Models." pith.science (2026). https://pith.science/paper/XCWBSSIA
@misc{pith2026241109273,
author = {Pith},
title = {Pith review of: Cross-Modal Consistency in Multimodal Large Language Models},
year = {2026},
howpublished = {\url{https://pith.science/paper/XCWBSSIA}},
note = {Machine review of arXiv:2411.09273}
}
read the original abstract
Recent developments in multimodal methodologies have marked the beginning of an exciting era for models adept at processing diverse data types, encompassing text, audio, and visual content. Models like GPT-4V, which merge computer vision with advanced language processing, exhibit extraordinary proficiency in handling intricate tasks that require a simultaneous understanding of both textual and visual information. Prior research efforts have meticulously evaluated the efficacy of these Vision Large Language Models (VLLMs) in various domains, including object detection, image captioning, and other related fields. However, existing analyses have often suffered from limitations, primarily centering on the isolated evaluation of each modality's performance while neglecting to explore their intricate cross-modal interactions. Specifically, the question of whether these models achieve the same level of accuracy when confronted with identical task instances across different modalities remains unanswered. In this study, we take the initiative to delve into the interaction and comparison among these modalities of interest by introducing a novel concept termed cross-modal consistency. Furthermore, we propose a quantitative evaluation framework founded on this concept. Our experimental findings, drawn from a curated collection of parallel vision-language datasets developed by us, unveil a pronounced inconsistency between the vision and language modalities within GPT-4V, despite its portrayal as a unified multimodal model. Our research yields insights into the appropriate utilization of such models and hints at potential avenues for enhancing their design.
Figures
Figures from the paper (15 more)
Forward citations
Cited by 2 Pith papers
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TokenSwap: Benchmarking and Reducing the Modality Gap in Multimodal LLMs
TokenSwap measures and mitigates the MLLM modality gap: swapping textual concepts for matched images lowers accuracy by 4-47% across 42 models, and training with such swaps reduces the gap.
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SEAM: Semantically Equivalent Across Modalities Benchmark for Vision-Language Models
SEAM measures VLM reasoning consistency across modalities using paired semantically equivalent textual and visual notations, and finds systematic vision-language imbalance.
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Reviewed August 12, 2026 · model on record in the stance chip above.
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