REVIEW 4 major objections 5 minor 39 references
Veracity Bias and Beyond: Uncovering LLMs' Hidden Beliefs in Problem-Solving Reasoning
T0 review · 4 major / 5 minor · reviewed 2026-08-07 · deepseek-v4-flash
Pith's one-line read Large language models, even after alignment training, systematically associate solution correctness with demographic identity rather than with solution content.
desk verdict The evaluation-bias finding is solid, but the attribution metric's 'more incorrect' claim is a forced-choice artifact; fix the design or the claim, and the citations need verification. 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 is the paired probe: an Attribution prompt that presents one known-correct and one known-incorrect solution and forces the model to assign each to one of three demographic options (either explicit labels or race-associated names), and an Evaluation prompt that presents an identical solution under different demographic completers and asks for a score. Bias is quantified with four metrics: Correctness Attribution Bias (ABcor) and Incorrectness Attribution Bias (ABinc), which look at the maximum difference in assignment probability between correct and incorrect solutions for any group, and Evaluation Inconsistency (EI) and Evaluation Preference (EP), which measure how often the same solution changes score across groups and which pair shows the largest score difference. All runs use temperature 0, and a random perturbation baseline with neutral placeholders is used to separate demographic effects from intrinsic randomness. This design aims to expose a hidden belief without invoking personas or social scenarios.
What would settle it
For a fixed math problem, run the attribution prompt twice: the first time presenting the correct solution as Solution 1, the second time presenting the same correct solution as Solution 2, keeping the demographic options fixed. If the demographic assignment flips with the presented veracity label, the Attribution Bias is confirmed as veracity-driven; if the assignment is unchanged, the bias is about the content itself, not perceived veracity.
Extended reading notes
Core claim
The paper's central discovery is that LLMs hold an internal veracity-demographic association: they are more likely to attribute a known-correct solution to White or Asian authors and a known-incorrect solution to Black authors in math and coding tasks, even when the same solution is presented neutrally. The bias is measurable statistically and persists across all five tested models, with two of the tested models showing extreme lows in attributing correct code to Black groups. In evaluation, models change their score of an identical solution when the author's name or ethnicity is altered, and the strongest preference appears in writing, where Hispanic-authored essays beat Asian-authored ones. A supplementary experiment shows the same models automatically pick stereotypical colors (light for White, dark for Black, gold for Asian, brown for Hispanic) in generated visualization code. The authors take this as evidence that demographic stereotypes are embedded in the models' reasoning process rather than being a surface output of explicit social-context prompts.
Load-bearing premise
The paper assumes that when a model assigns a known-correct solution to a demographic label, the choice reveals its internal belief about that group's competence, rather than a statistical association with the name or a pattern-matching artifact of the prompt.
Editorial extensions
If this is right
- Automated grading systems built on LLMs will systematically under-score or over-score students based on perceived race or gender, even for identical submitted work.
- Tutoring and solution-generation systems may route correct solutions toward some demographic groups and incorrect ones toward others, widening achievement gaps.
- Because models rarely refuse attribution requests, alignment training has not internalized demographic fairness in reasoning-centered tasks.
- Bias persists at temperature zero, so it is deterministic and cannot be waved off as sampling noise.
- The color-assignment result implies the bias transfers to non-social generation tasks, so code that visualizes demographic data may propagate stereotypical associations.
Reading between the lines
- A control that swaps which solution is labeled correct across trials could separate veracity-driven attribution from content-driven pattern matching; the paper does not report such a test.
- Evaluation bias is largest in essay scoring, suggesting rubric subjectivity may amplify the effect; testing with more objective rubrics could reveal whether ambiguity is necessary.
- The color-assignment finding suggests stereotype associations extend beyond semantic labels; probing with image generation could test whether the perceptual bias generalizes.
- The paper's metrics are unsigned, so adding a signed preference vector per group would make the direction of bias explicit and comparable across models.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. This paper introduces the notion of 'Veracity Bias' in LLMs, defined as the tendency of models to associate solution correctness/incorrectness with demographic groups. The authors design two tasks: Attribution (A), where models assign one correct and one incorrect solution to two of three demographic options, and Evaluation (E), where models grade identical solutions attributed to different demographics. Experiments are reported across five aligned LLMs (GPT-3.5-turbo, GPT-4o, Gemini-1.5-Pro, Claude 3 Sonnet, LLaMA-3-8b) and several benchmarks (GSM8K, MATH, HumanEval, CommonsenseQA, ARC-Easy, ASAP-AES), with additional results on DeepSeek-V3 and Qwen2.5 and on stereotypical color assignment in code. The central claims are that models attribute fewer correct and more incorrect solutions to African-American groups in math and coding, and that evaluation scores vary with perceived authorship beyond random perturbation (Abstract; Section 3.2).
Significance. The topic is timely, and the dual-task design is a reasonable way to probe hidden demographic associations in reasoning, going beyond persona-prompting and direct stereotype questions. The paper covers five aligned models and multiple domains, uses temperature-0 outputs, and includes a random perturbation baseline for evaluation bias. If the identification issues raised in the major comments are addressed, the paper could make a valuable contribution to the bias-and-fairness literature. The color-assignment study is a striking illustration of implicit associations in code generation. The paper does not provide machine-checked proofs or code, but the experimental method is reproducible in principle.
major comments (4)
- [Section 2.2, Figure 1, Eqs. (1)-(2)] The forced-choice attribution protocol confounds independent incorrectness bias with the mechanical complement of correct-solution preference. Given three demographic options and two solutions assigned to distinct options, once the model selects a group for the correct solution, the incorrect solution must be assigned to one of the remaining two groups. Thus P(d|incorrect) is not a free quantity; a model that always assigns correct solutions to White/Asian groups will produce elevated P(Black|incorrect) even if it has no belief connecting Black authors to incorrect answers. The paper's headline claim that Black groups receive 'more incorrect' attributions (Abstract; Section 3.2, observations 1-2) is therefore not identified by the reported experiment. Please either (a) reframe the claim to 'fewer correct' attribution only, (b) add an independent-labeling control where each solution is attributed separately (e.g., with an 'other/none' option), or (c) compare the observed incorrect-attribution distribution to the distribution predicted by a null model in which the incorrect solution is assigned uniformly among the options not chosen for the correct solution.
- [Section 3.2, Table 2] The paper states that EI values 'consistently exceed' the random perturbation baseline, but no confidence intervals or statistical tests are reported for these comparisons. Several cells are close (e.g., GPT-4o race EI 17% vs random 9%; Claude-3 math 0% vs 0%; LLaMA writing race 13.3% vs 3.3%). Without uncertainty quantification, the 'beyond random perturbation' claim (Abstract) is not supported. Please report confidence intervals (e.g., bootstrap) or exact tests (e.g., McNemar-style per-item comparisons), and specify what the 'neutral placeholders' are in the random perturbation baseline.
- [Section 3.1, Data Selection] The 'Solvable' filter—requiring correct solutions across five temperatures up to 0.9—may select an unrepresentative subset of easy, high-confidence problems. The magnitude and direction of attribution bias could differ on more challenging items, so the generalization of the central claim to 'LLMs' behavior is unclear. Please report the number of questions that passed the filter for each model and benchmark and, if feasible, compare results on the full benchmark or on a broader sample.
- [Section 3.2, Table 1 and refusal rates] Refusal handling is not described for the main metrics. The text mentions refusal rates for GPT-4o (14% math, 28% coding) and Claude (2% commonsense), but it is not stated whether refusals are excluded from the denominator or treated as a separate outcome. This affects the reported percentages and the chi-square tests. Please clarify the handling and report both raw counts and refusal-excluded analyses.
minor comments (5)
- [Section 2.2] The 'Prompt Template for Evaluation (A)' should likely be labeled '(E)' to match the Evaluation Bias task.
- [Table 1] The category labels switch between 'Black' and 'African-American' across the text and tables; please standardize the terminology.
- [Section 3.3] The color-assignment result is based on 50 repetitions but no quantitative summary or statistical test is given; consider reporting the distribution of color choices per group.
- [Section 5 (Limitations)] The Limitations section does not mention the forced-choice complementarity issue discussed in the major comments; please expand it to cover this measurement limitation.
- [Section 4 (References)] Some references appear unverifiable (e.g., 'Doe and Chen 2023' and 'Garcia and Patel 2023' in Section 4); please verify that all citations point to real, retrievable publications.
Circularity Check
No significant circularity: the headline metrics are computed directly from LLM outputs on external benchmark items, and the paper's self-citations appear only as background; the forced-choice attribution design raises an identification caveat but is not a derivation that reduces to its inputs.
full rationale
The paper's central quantities (P(d|correct), P(d|incorrect), EI, EP) are obtained by querying five LLMs on external benchmark problems (GSM8K, MATH, HumanEval, CommonsenseQA, ARC-Easy, ASAP-AES) and are not fitted parameters or predictions derived from the experiment's own construction. No equation in the paper defines ABinc as a transform of ABcor; both are computed from the model's actual cloze assignments. The authors' self-citations (Zhou et al., 2024a, 2024b, 2025) occur in the related-work and mitigation discussion and are not used to justify the experimental design, the metrics, or the main conclusion. The forced-choice attribution protocol (Section 2.2) does create a partial identification caveat: because each trial pairs one correct and one incorrect solution and asks for demographic assignments, the incorrect-attribution margin can be inflated for groups dispreferred on the correct margin; this is a validity threat to the 'more incorrect' sub-claim, but it is not a circular derivation in the sense of Eq. X = Eq. Y by construction, since the model could in principle distribute incorrect assignments non-uniformly among the remaining groups. The evaluation-bias and color-assignment studies are direct behavioral measurements with perturbation baselines, and the Limitations section disclaims causal explanation rather than assuming the conclusion. Therefore the circularity score is minimal.
Assumptions & free parameters
assumptions (5)
- domain assumption Benchmark ground-truth correctness (GSM8K, MATH, HumanEval, CommonsenseQA, ARC-Easy, ASAP-AES) is valid.
- domain assumption Race-associated names are valid proxies for demographic groups.
- domain assumption Temperature-0 outputs are deterministic enough for stable measurement.
- ad hoc to paper The forced-choice attribution prompt measures veracity-demographic association rather than a response-format artifact.
- domain assumption The ASAP-AES rubric is an appropriate ground truth for essay quality.
Cite this review
Pith. "Pith review of Veracity Bias and Beyond: Uncovering LLMs' Hidden Beliefs in Problem-Solving Reasoning." pith.science (2026). https://pith.science/paper/5SAE7BOT
@misc{pith2026250516128,
author = {Pith},
title = {Pith review of: Veracity Bias and Beyond: Uncovering LLMs' Hidden Beliefs in Problem-Solving Reasoning},
year = {2026},
howpublished = {\url{https://pith.science/paper/5SAE7BOT}},
note = {Machine review of arXiv:2505.16128}
}
read the original abstract
Despite LLMs' explicit alignment against demographic stereotypes, they have been shown to exhibit biases under various social contexts. In this work, we find that LLMs exhibit concerning biases in how they associate solution veracity with demographics. Through experiments across five human value-aligned LLMs on mathematics, coding, commonsense, and writing problems, we reveal two forms of such veracity biases: Attribution Bias, where models disproportionately attribute correct solutions to certain demographic groups, and Evaluation Bias, where models' assessment of identical solutions varies based on perceived demographic authorship. Our results show pervasive biases: LLMs consistently attribute fewer correct solutions and more incorrect ones to African-American groups in math and coding, while Asian authorships are least preferred in writing evaluation. In additional studies, we show LLMs automatically assign racially stereotypical colors to demographic groups in visualization code, suggesting these biases are deeply embedded in models' reasoning processes. Our findings indicate that demographic bias extends beyond surface-level stereotypes and social context provocations, raising concerns about LLMs' deployment in educational and evaluation settings.
Figures
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Reference graph
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Reviewed August 7, 2026 · model on record in the stance chip above.
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