REVIEW 3 major objections 5 minor 37 references
IRLBench: A Multi-modal, Culturally Grounded, Parallel Irish-English Benchmark for Open-Ended LLM Reasoning Evaluation
T0 review · 3 major / 5 minor · reviewed 2026-08-15 · deepseek-v4-flash
Pith's one-line read The paper claims that current LLMs are substantially weaker at open-ended reasoning in Irish than in English, with the best model dropping from 76.2% to 55.8% on parallel Leaving Certificate exam questions.
desk verdict A genuinely useful new benchmark for an extremely low-resource language, but the headline performance gap rests on an unvalidated LLM judge and some inconsistent arithmetic; referee it, but require human agreement data and fixed tables. 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 benchmark itself is the central object: 1,700 parallel English–Irish question/marking-scheme pairs extracted from official 2024 Leaving Certificate Higher Level exams, with 18.11% of samples containing images. Evaluation runs through two instruments: gemini-2.5-flash acting as an LLM judge that compares a model's free-form answer against the official marking scheme and assigns a correct/incorrect label, and a FastText sentence-level language identifier that classifies a response as Irish only if at least half of its sentences are Irish. The official marking scheme gives the judge a fixed scoring target, while the parallel structure makes the English–Irish gap a within-item comparison rather than a comparison across different datasets.
What would settle it
Have fluent Irish examiners double-score a random sample of model responses on the Irish split and compare their labels with gemini-2.5-flash's; if human-judge agreement is low or the gap shrinks under human scoring, the headline performance numbers fail.
Extended reading notes
Core claim
The central discovery claimed is that, given identical exam questions in parallel English and Irish, every evaluated LLM performs substantially worse in Irish, with performance gaps exceeding 10 percentage points even for the strongest models, and that generative language fidelity is itself a bottleneck: models frequently answer in English when asked in Irish. The authors attribute this to weak multilingual transfer in current models, especially reasoning-optimized ones, and present IRLBench as the first multilingual, culturally grounded, parallel benchmark designed for open-ended generative evaluation in an extremely low-resource language scenario.
Load-bearing premise
The reported English–Irish gap depends entirely on gemini-2.5-flash grading open-ended Irish and English answers against official marking schemes as reliably as a human examiner would, and the paper provides no human-agreement check on that judge.
Editorial extensions
If this is right
- If IRLBench measures what it claims, any deployment of current LLMs for Irish-language education or public services should expect materially lower accuracy than in English, even on identical content.
- Reasoning-optimized models show a larger English–Irish gap (20.4% for o4-mini versus 12.9% for gpt-4.1), so test-time scaling has not fixed low-resource multilingual transfer.
- Because most models emit valid Irish less than 80% of the time, language fidelity must be tracked as a separate metric from factual correctness when evaluating low-resource generation.
- The near-90% saturation of existing Irish-capable datasets such as SIB200 and Belebele is an artifact of multiple-choice formats; open-ended evaluation reveals much weaker capabilities.
- Subject-level results, such as open-source models lagging most in science and least in social studies, point to where multilingual training data and evaluation effort are most needed.
Reading between the lines
- A direct extension would build the same parallel-exam benchmark for other endangered languages with official bilingual examinations, such as Welsh or Basque, to test whether the gap is specific to Irish or generalizes to any low-resource language.
- If human examiners double-scored a random subset, the measured gap could shrink or grow; until then, part of the 20-point gap may be judge error rather than pure model inability.
- The correlation between answering correctly and answering in Irish suggests that language generation and reasoning are not independent in low-resource settings, so improving Irish fluency might also improve correctness.
- Because the paper reports model confidence above 80% despite Irish accuracy below 60%, IRLBench doubles as a testbed for confidence calibration in low-resource languages.
Signed reviews
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper introduces IRLBench, a parallel English–Irish, multimodal benchmark of 1,700 open-ended questions and official marking schemes derived from the 2024 Irish Leaving Certificate higher-level exams across 12 subjects. The authors propose an LLM-as-a-judge protocol (gemini-2.5-flash) for binary correctness grading against official marking schemes, plus a FastText sentence-level language identification rule for scoring Irish-language fidelity. They evaluate six closed- and open-source models and report a persistent performance gap between English and Irish, with the best model (o4-mini) scoring 76.2% in English versus 55.8% in Irish, and most models producing valid Irish responses less than 80% of the time. The dataset and evaluation code are released.
Significance. If the evaluation protocol is trustworthy, IRLBench is a valuable and timely contribution to low-resource multilingual evaluation. Its grounding in official examinations and marking schemes gives it external validity, the parallel English–Irish design permits controlled cross-lingual comparisons, and the inclusion of multimodal items and open-ended generation goes beyond the multiple-choice format of most existing multilingual benchmarks. The release of the dataset and codebase is a concrete asset to the community. The reported finding that even strong reasoning models exhibit a large English–Irish gap, and the accompanying confidence miscalibration analysis, are potentially important. However, the central quantitative claims rest on an unvalidated LLM-as-a-judge, with no human agreement data, and the exact reported averages contain internal inconsistencies; these issues must be addressed before the headline numbers can be relied upon.
major comments (3)
- [Section 3.3 / Section 4.1 / Section 5] The central quantitative claims—the 76.2% versus 55.8% English–Irish gap for o4-mini and the language-fidelity rates below 80%—depend entirely on the reliability of gemini-2.5-flash as a binary judge grading open-ended Irish and English responses against official marking schemes. The paper reports no human agreement study, no judge calibration analysis, no judge-variance analysis, and no comparison with a second judge model. The paper's own Limitations section concedes that the LLM-as-a-judge paradigm 'may present challenges in scalability and robustness' (Section 5). If the judge is systematically stricter or more confused on Irish responses, or if it is biased by the language of the response, the reported gap could be substantially inflated or deflated. The authors should provide a sample-based human agreement study (e.g., Cohen's kappa or percentage agreement) for both English and Irish splits, report judge consistency across repeated runs, and ideally compare the primary judge against at least one alternative judge to estimate judge-induced variance.
- [Table 3] Table 3 contains internal arithmetic inconsistencies that reduce confidence in the reported averages. For example, the reported Irish average for aya-vision-8b is 0.36, but the weighted combination of the per-group rows (0.22×582 + 0.00×590 + 0.62×326 + 1.00×202)/1700 gives 0.31; similarly, the reported Irish average for o4-mini is 55.82, but the weighted combination of the rows gives approximately 53.91, and the reported English average for aya-vision-8b is 38.55 while the weighted rows give approximately 38.90. These are not rounding errors of the magnitude shown. The authors should recompute all averages with the correct group weights, or clearly explain the aggregation formula if it is not a simple weighted mean of the subject-group rows.
- [Section 3.3 / Section 4.3] The language-fidelity criterion is defined by an arbitrary threshold: a response is classified as non-Irish if more than 50% of its sentences are detected as English by a FastText sentence-level classifier. This threshold and the underlying classifier are not validated against human judgments, and no sensitivity analysis is reported. Code-switched or partially Irish responses may be misclassified by a sentence-level rule, and the FastText model's accuracy on Irish—especially on academic exam responses containing domain terms and proper nouns—is not assessed. The authors should report classifier accuracy for Irish (or a validation subset), and show how the reported language-fidelity percentages change under alternative thresholds (e.g., 30%, 50%, 70%) to establish that the 'less than 80%' claim is robust rather than an artifact of the chosen cutoff.
minor comments (5)
- [Section 3.2] The text reads 'Science follows closely with 5982 samples'—this is a typo; it should be 582 samples, consistent with Table 2 and the stated total of 1,700.
- [Section 4.2] The word 'Noteably' should be 'Notably'; also consider avoiding the colloquial phrase "failing almost entirely" in favor of a more precise quantitative description of the near-zero Irish accuracy of aya-vision models.
- [Section 4.3 / Figure 6] The analysis excludes models with extremely low accuracy but does not specify which models are excluded or the number of remaining valid responses per model; the 'less than 80%' claim would be easier to verify if per-model sample sizes and exclusion criteria were stated.
- [Section 3.3] The binary-judge simplification is described as 'consistent and comparable,' but the paper does not discuss the degree to which binary correctness agrees with the official marking schemes' granular scoring; a brief analysis of score distribution or a calibration check would strengthen the claim.
- [Figure 1 / References [10], [11], [12]] Figure 1 compares IRLBench with prior Irish benchmarks, including the authors' own IrishQA dataset ([12]); to avoid any appearance of self-serving comparison, the authors should note in the caption or text that IrishQA is from their prior work and clarify the saturation claim's independence from that baseline.
Circularity Check
No significant circularity: the benchmark and its reported performance gap are externally grounded in official exam materials and measured outcomes, with no fitted parameter or self-citation chain doing derivational work.
full rationale
IRLBench's construction is anchored to the 2024 Irish Leaving Certificate exam papers and their official marking schemes (Section 3.1), so correctness is measured against an external academic standard rather than derived from the paper's own model outputs. The headline English–Irish gap (e.g., o4-mini 76.2% vs 55.8%, Section 4.1) and the language-fidelity percentages are observed evaluation scores produced by gemini-2.5-flash under the LLM-as-a-judge protocol and a stated 50% FastText threshold (Section 3.3). These are decision rules for measurement, not fitted parameters renamed as predictions, and no equation in the paper defines a derived result in terms of its own input. The paper cites its own IrishQA dataset [12] as an example of a saturated Irish benchmark, but that citation is only motivational context; the central benchmark and gap findings do not depend on the saturation claim. Concerns about judge reliability or arithmetic inconsistencies in Table 3 are validity and correctness issues, not circularity. Therefore, no circular step is established.
Assumptions & free parameters
free parameters (1)
- language fidelity threshold =
50% of sentences detected as English
assumptions (4)
- domain assumption English and Irish versions of each Leaving Certificate exam have identical content, making language the only variable.
- domain assumption gemini-2.5-flash as LLM-as-a-judge provides valid binary correctness judgments against official marking schemes.
- domain assumption FastText language identification reliably distinguishes Irish from English in LLM-generated text.
- domain assumption Official marking schemes can be reduced to a binary correct/incorrect judgment without losing validity.
Cite this review
Pith. "Pith review of IRLBench: A Multi-modal, Culturally Grounded, Parallel Irish-English Benchmark for Open-Ended LLM Reasoning Evaluation." pith.science (2026). https://pith.science/paper/DB4M4BMD
@misc{pith2026250513498,
author = {Pith},
title = {Pith review of: IRLBench: A Multi-modal, Culturally Grounded, Parallel Irish-English Benchmark for Open-Ended LLM Reasoning Evaluation},
year = {2026},
howpublished = {\url{https://pith.science/paper/DB4M4BMD}},
note = {Machine review of arXiv:2505.13498}
}
read the original abstract
Recent advances in Large Language Models (LLMs) have demonstrated promising knowledge and reasoning abilities, yet their performance in multilingual and low-resource settings remains underexplored. Existing benchmarks often exhibit cultural bias, restrict evaluation to text-only, rely on multiple-choice formats, and, more importantly, are limited for extremely low-resource languages. To address these gaps, we introduce IRLBench, presented in parallel English and Irish, which is considered definitely endangered by UNESCO. Our benchmark consists of 12 representative subjects developed from the 2024 Irish Leaving Certificate exams, enabling fine-grained analysis of model capabilities across domains. By framing the task as long-form generation and leveraging the official marking scheme, it does not only support a comprehensive evaluation of correctness but also language fidelity. Our extensive experiments of leading closed-source and open-source LLMs reveal a persistent performance gap between English and Irish, in which models produce valid Irish responses less than 80\% of the time, and answer correctly 55.8\% of the time compared to 76.2\% in English for the best-performing model. We release IRLBench (https://huggingface.co/datasets/ReliableAI/IRLBench) and an accompanying evaluation codebase (https://github.com/ReML-AI/IRLBench) to enable future research on robust, culturally aware multilingual AI development.
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