REVIEW 3 major objections 5 minor 7 cited by
Great Models Think Alike and this Undermines AI Oversight
T0 review · 3 major / 5 minor · reviewed 2026-08-08 · deepseek-v4-flash
Pith's one-line read This paper argues that functional similarity between language models, measured by overlap in mistakes, biases AI judges, drives weak-to-strong training gains, and is increasing with capability, so AI oversight will inherit shared blind…
desk verdict CAPA is a real metric and the capability-similarity trend is a genuine finding; the uniform-chance baseline is a soft spot but not fatal, since discrete error consistency corroborates the trend. 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
CAPA (Chance Adjusted Probabilistic Agreement), denoted $\kappa^p$, is the paper's central object: an agreement metric of the form $(\text{observed} - \text{chance})/(1 - \text{chance})$. Observed agreement $c^p_{obs}$ is the average, over samples, of the inner product of the two models' output probability distributions over the answer options; chance agreement $c^p_{exp}$ assumes independent models that put their average correct probability $p_j$ on the ground-truth option and spread the remaining probability uniformly over the wrong options. This adjusts for accuracy, distinguishes different wrong answers from each other, and uses probabilities rather than hard predictions. The metric generalizes error consistency and is the instrument used to detect judge affinity bias, measure supervisor-student complementarity, and trace the capability-similarity trend.
What would settle it
Run the capability-similarity analysis on models whose wrong-answer choices are heavily concentrated on one option (e.g., a positional bias), and recompute CAPA with the uniform-error null replaced by empirical wrong-option marginals; if the rising trend with capability weakens or reverses, the trend is an artifact of the null model rather than a property of model errors.
Extended reading notes
Core claim
The paper's central claim is that functional similarity between language models, properly measured, is a hidden confounder in both halves of AI oversight. In evaluation, judges are biased toward similar models: the affinity bias extends beyond self-preference to any model whose error pattern resembles the judge's, with significant partial correlation after controlling for accuracy. In training, complementarity explains weak-to-strong generalization: the less similar the weak supervisor and strong student, the larger the gain, and this complementary knowledge raises the estimated ceiling beyond pure elicitation. Most concerningly, similarity is not fixed: across five capability buckets of 130 models, average pairwise CAPA rises with accuracy, indicating that as models get better they fail in more alike ways. The paper concludes that reporting and correcting for model similarity should become standard practice in AI oversight.
Load-bearing premise
The chance-agreement baseline in CAPA assumes that when a model is wrong, its probability mass is spread evenly over all wrong answer choices; if real models have systematic preferences among wrong options, the computed similarity values and all three trends could be biased.
Editorial extensions
If this is right
- Leaderboard scores produced by LLM-as-a-judge inherit the judge's error pattern: excluding the judge's own family from a ranking is not enough, and similarity should be reported or regressed out.
- Weak-to-strong training gains can be predicted before training from supervisor-student CAPA, and the previously estimated ceiling from elicitation is too low; exploiting complementary knowledge is a concrete avenue for better weak-to-strong methods.
- If correlated errors keep rising with capability, LM juries are less independent than they appear, and majority-vote oversight can amplify a shared blind spot rather than cancel it.
- Model diversity itself becomes a safety-relevant property: measuring CAPA between candidate models can flag when an oversight stack is about to lose its independent checkers.
Reading between the lines
- The uniform-error null model is the piece most worth stress-testing: if real models concentrate wrong-answer probability on particular options (a position bias), CAPA could be systematically inflated, so re-deriving CAPA with empirical wrong-option marginals is a natural robustness check.
- The paper's finding that instruction-tuned models show a steeper similarity trend suggests a testable intervention: training with deliberately diversified instruction data or distinct alignment targets might slow error convergence and preserve oversight value.
- The affinity-bias result implies a concrete debiasing recipe the paper does not test: assembling a jury whose members have low pairwise CAPA and comparing its verdicts against a single judge.
- Extending CAPA to free-text responses, via embedding-based agreement, would connect similarity analysis to the oversight setups (debate, process supervision) that the paper names as future work.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper introduces Chance Adjusted Probabilistic Agreement (CAPA), a pairwise similarity metric for language models defined on MCQ output probabilities. CAPA extends error consistency by counting different wrong predictions as disagreement and by using probabilistic predictions rather than hard labels. The authors apply CAPA to three questions: (i) LLM-as-a-judge scores are positively correlated with judge-model similarity after controlling for accuracy; (ii) weak-to-strong generalization gains are larger when the weak supervisor and the strong student are less similar; and (iii) average pairwise CAPA among 130 open LMs increases with accuracy, implying that model mistakes are becoming more correlated as capabilities improve. The paper concludes that reliance on other LMs for AI oversight carries risks from correlated failures and recommends reporting sample-wise predictions.
Significance. If the empirical findings hold, this is a timely and useful contribution: CAPA is a clean, bounded, probabilistic generalization of error consistency; the affinity-bias result extends self-preference findings to a broader class of similarity; the weak-to-strong analysis offers a new predictor of training gains; and the capability-similarity trend is a falsifiable warning about correlated failures. Strengths include the explicit derivation and simulation of CAPA, partial correlations controlling for accuracy and model size, per-category robustness checks, and the use of multiple alternative agreement metrics in the appendices. The main caveat is that all headline numbers inherit the uniform-distractor chance baseline in Eq. (3), whose validity is not established; the weak-to-strong analysis also excludes several runs in a way that may bias the reported correlation.
major comments (3)
- [Section 2.2, Eq. (3), Appendix A.4] The chance-agreement term for incorrect options assumes that a wrong model distributes its error mass uniformly over the |O(x)|-1 non-ground-truth options. This is the only chance baseline in CAPA and is inherited by all three empirical findings. In MMLU-Pro and BBH, wrong options are not semantically exchangeable: models systematically prefer certain distractors, so two conditionally independent models that share a distractor preference will agree on wrong options more often than the uniform null predicts, inflating kappa_p. The defense in Appendix A.4, that MCQ options can be permuted and that answer options are balanced by design, addresses the marginal frequency of correct options, not the conditional distribution of errors over wrong options. Because the Section 5.2 capability trend is the headline safety claim, the paper should show that the trend is not an artifact of this prior. Concretely, I ask for a null or sensitivity analysis that matches per-question accuracy and empirical distractor margins (e.g., permuting wrong-option labels within questions across models or estimating a data-driven wrong-option prior) and for a report of whether the Figure 6 trend and the Table 2 partial correlations survive. The error-consistency result in Appendix D.3 is relevant because it does not use the uniform-wrong-option assumption, but it is presented only qualitatively and should be quantified and tied to this concern.
- [Section 4, Appendix C.1] Appendix C.1 reports that three weak models (SmolLM-1.7B, Qwen2.5-0.5B, Llama-3.2-1B) and the Hellaswag dataset were discarded after observing negative weak-to-strong gains or low accuracies. The main Section 4 claim, that lower similarity predicts larger gains, is estimated only on the remaining 12 model pairs. Excluding runs because the outcome variable is unfavorable can induce selection bias and may overstate the strength of the correlation. The paper should either provide a pre-specified inclusion criterion or report a sensitivity analysis that includes the discarded runs, with gains computed on the same scale, so readers can judge whether the qualitative conclusion survives.
- [Section 5.2, Figure 6] The headline trend is reported as a 'strong positive correlation' without a correlation coefficient, confidence interval, or p-value, and the 130 plotted points are not independent because each model's mean similarity is computed against overlapping sets of partners from the same bucket. The paper should report the exact statistic (e.g., Pearson or Spearman r with CI) and use a bootstrap or mixed-effects procedure that accounts for the non-independence of pairwise similarities. The per-category analyses in Appendix D.4 are supportive but inherit the same dependence structure.
minor comments (5)
- [Abstract and Section 1] The metric is called 'Chance Adjusted Probabilistic Agreement' in the abstract and 'Chance Adjusted Probabilistic Alignment' in the introduction; the name should be unified.
- [Appendix A.7] The sentence 'Results are reported in main paper in Sec. A.7' appears to refer to Section 2.2 and Figure 2, not to an appendix section; the cross-reference should be corrected.
- [Section 6] The phrase 'canapriori predict gains' is missing a space and should read 'can a priori predict gains'.
- [Figure 3 caption] The caption 'Judgment Score Relation with Model Similarity on only across family pairs' is grammatically awkward and should be rewritten as 'on across-family pairs only'.
- [Appendix C.5] The phrase 'The astute observer may be confused' is informal for a refereed paper; the point about the bottom-right quadrant can be stated directly.
Circularity Check
No significant circularity; the only by-construction element is a sanity-check simulation that uses the metric's own null model, while the three empirical findings are external correlational analyses.
-
self definitional
[Section 2.2, Eq. 3 and Figure 2 (simulation of independent models)]
"Then, we define independent models as assigning pj probability to the correct option, and uniformly distributing the remaining 1 − pj probability over the incorrect options. ... In this simulation, for each model we select an independent random subset of samples as correct ... CAPA correctly reports 0 similarity when models have uncorrelated errors."
The simulated data-generating process is exactly the null model used to define chance agreement c_exp in Eq. 3 (uniform error mass over wrong options). Therefore κp = (c_obs^p − c_exp^p)/(1 − c_exp^p) = 0 follows by construction, not by empirical test. This validates internal consistency but does not independently confirm the metric's interpretation. It is not load-bearing for the paper's main empirical findings, which use CAPA on real model outputs and correlate it with external labels (judge scores, weak-to-strong gains, capability buckets).
full rationale
The paper's central derivation chain is: define CAPA (Eq. 2-4), then use it as a fixed, parameter-free similarity measure in three external correlational analyses. No constant is fitted to produce the reported correlations; p_j is computed from model probabilities, and the weak-to-strong similarity is measured on validation data before training, making it a genuine a priori predictor. The judge-affinity, complementary-knowledge, and capability-similarity findings are empirical associations with independent content. The uniform-error chance baseline in Eq. 3 is an explicit modeling assumption (Appendix A.4); if real models share systematic distractor preferences, κp is biased, but this is a validity or correctness concern rather than circularity, since the result does not reduce to its inputs by construction. The only by-construction element is the Figure 2 simulation, which verifies that CAPA returns 0 on its own null model; this is a sanity check, not a prediction. No load-bearing self-citation or imported uniqueness theorem appears; citations to Geirhos et al. (2020, 2021) and Burns et al. (2024) provide external baselines and setup. Overall circularity is minimal and non-central.
Assumptions & free parameters
assumptions (5)
- domain assumption Independent models distribute their incorrect predictions uniformly over the non-ground-truth options in a multiple-choice question.
- domain assumption Softmaxed log-likelihoods from the OpenLLM Leaderboard are a valid probability distribution over MCQ options.
- domain assumption The 130 models in OpenLLM Leaderboard and the 12 W2S model pairs form a representative sample of capability levels and families.
- domain assumption The LLM-as-a-judge binary choice (0/1) without reference answers is a meaningful proxy for response correctness.
- domain assumption Standard inter-rater agreement framework (observed agreement minus chance agreement scaled by maximum excess agreement, Eq. 5) applies to model similarity.
Cite this review
Pith. "Pith review of Great Models Think Alike and this Undermines AI Oversight." pith.science (2026). https://pith.science/paper/CSWETT4L
@misc{pith2026250204313,
author = {Pith},
title = {Pith review of: Great Models Think Alike and this Undermines AI Oversight},
year = {2026},
howpublished = {\url{https://pith.science/paper/CSWETT4L}},
note = {Machine review of arXiv:2502.04313}
}
read the original abstract
As Language Model (LM) capabilities advance, evaluating and supervising them at scale is getting harder for humans. There is hope that other language models can automate both these tasks, which we refer to as ''AI Oversight''. We study how model similarity affects both aspects of AI oversight by proposing Chance Adjusted Probabilistic Agreement (CAPA): a metric for LM similarity based on overlap in model mistakes. Using CAPA, we first show that LLM-as-a-judge scores favor models similar to the judge, generalizing recent self-preference results. Then, we study training on LM annotations, and find complementary knowledge between the weak supervisor and strong student model plays a crucial role in gains from ''weak-to-strong generalization''. As model capabilities increase, it becomes harder to find their mistakes, and we might defer more to AI oversight. However, we observe a concerning trend -- model mistakes are becoming more similar with increasing capabilities, pointing to risks from correlated failures. Our work underscores the importance of reporting and correcting for model similarity, especially in the emerging paradigm of AI oversight.
Figures
Figures from the paper (18 more)
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