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arxiv: 2606.03969 · v1 · pith:EJUQGIVHnew · submitted 2026-06-02 · 💻 cs.CL · cs.AI

Quantifying Faithful Confidence Expression in Large Reasoning Models

Areeb Gani , Asal Meskin , Gabrielle Kaili-May Liu , Arman Cohan This is my paper

Pith reviewed 2026-06-28 10:20 UTC · model grok-4.3

classification 💻 cs.CL cs.AI
keywords faithful confidence expressionlarge reasoning modelsuncertainty calibrationchain-of-thought reasoningLLM trustworthinessinternal uncertainty
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The pith

Large reasoning models struggle to faithfully express their internal confidence in long traces.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper develops a framework to quantify faithful confidence expression in large reasoning models by comparing linguistic decisiveness to internal uncertainty. It uses three sources: token probabilities, hidden states, and response consistency, with prefix-conditioned sampling to handle variations in long outputs. Findings indicate that faithful confidence expression is a significant challenge, not improved by reasoning behaviors or existing prompt interventions. This is important because extended reasoning traces are often taken as signs of reliable confidence by users. Different estimators also disagree, highlighting issues with current evaluation methods.

Core claim

Faithful confidence expression is a significant challenge for LRMs. Reasoning behaviors do not automatically translate to improved FC, and prompt interventions for non-reasoning models do not improve faithfulness in the reasoning setting. The introduced framework analyzes linguistic decisiveness relative to internal uncertainty from token probabilities, hidden states, and sampled response consistency, using prefix-conditioned sampling.

What carries the argument

Framework for quantifying FC by analyzing linguistic decisiveness relative to three sources of internal uncertainty with prefix-conditioned sampling to control for trace variations.

If this is right

  • FC is established as a distinct reliability and alignment target for LRMs.
  • Extended reasoning does not inherently lead to better confidence faithfulness.
  • Prompt interventions effective for non-reasoning models fail to improve FC in LRMs.
  • Multiple confidence estimators can produce divergent assessments of the same traces.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • High-stakes deployments of LRMs may require additional safeguards against over-trust in apparent confidence.
  • New training approaches could aim to directly optimize alignment between internal states and linguistic expressions of certainty.
  • The divergence in estimators suggests potential value in combining multiple uncertainty signals for more robust assessment.

Load-bearing premise

The three sources of internal uncertainty provide a reliable proxy for the model's intrinsic confidence that can be compared to its linguistic decisiveness.

What would settle it

Showing that linguistic decisiveness in LRM traces consistently aligns with the combined internal uncertainty measures on multiple datasets would contradict the claim that FC is a significant challenge.

Figures

Figures reproduced from arXiv: 2606.03969 by Areeb Gani, Arman Cohan, Asal Meskin, Gabrielle Kaili-May Liu.

Figure 1
Figure 1. Figure 1: Overview of our framework to measure and analyze faithful calibration of reasoning models. [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Dataset-level linguistic decisiveness and [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Start-to-end change trajectories in confidence and faithfulness, averaged across datasets [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Prompt intervention effects relative to the baseline prompt. Each bar reports the average [PITH_FULL_IMAGE:figures/full_fig_p009_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Subsampling robustness analysis for max_sample_steps = 20. Using a higher-budget run with up to 100 sampled steps per trace as a reference, we repeatedly subsample 20 steps per trace and recompute sampling confidence, sampling faithfulness, and cMFG∗ S . The subsampled estimates concentrate near the full-budget reference, indicating that the 20-step cap provides a stable dataset￾level estimate while substa… view at source ↗
Figure 6
Figure 6. Figure 6: Prompt to score decisiveness from model response. [PITH_FULL_IMAGE:figures/full_fig_p018_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Prompt to determine consistency from subsampled steps. [PITH_FULL_IMAGE:figures/full_fig_p021_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Distribution of confidence–decisiveness absolute gaps [PITH_FULL_IMAGE:figures/full_fig_p024_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Dataset-level composition of confidence–decisiveness gap bins for the three intrinsic [PITH_FULL_IMAGE:figures/full_fig_p024_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Relationship between the fraction of strong confidence–decisiveness mismatches and [PITH_FULL_IMAGE:figures/full_fig_p025_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: Confidence distribution on wrong answers across intrinsic-confidence estimators. The [PITH_FULL_IMAGE:figures/full_fig_p025_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: Fraction of wrong answers falling in the very-high-confidence bin by dataset and estimator. [PITH_FULL_IMAGE:figures/full_fig_p026_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: Relative confidence-bin composition among wrong answers, broken down by dataset and [PITH_FULL_IMAGE:figures/full_fig_p026_13.png] view at source ↗
Figure 14
Figure 14. Figure 14: Confidence-bin support and linguistic decisiveness across intrinsic-confidence estimators. [PITH_FULL_IMAGE:figures/full_fig_p028_14.png] view at source ↗
Figure 15
Figure 15. Figure 15: Baseline confidence-bin support on AIME. [PITH_FULL_IMAGE:figures/full_fig_p029_15.png] view at source ↗
Figure 16
Figure 16. Figure 16: Baseline confidence-bin support on HLE. [0.0, 0.1] (0.1, 0.2] (0.2, 0.3] (0.3, 0.4] (0.4, 0.5] (0.5, 0.6] (0.6, 0.7] (0.7, 0.8] (0.8, 0.9] (0.9, 1.0] Intrinsic Confidence Bin 0 50 100 150 200 250 300 350 400 Number of Samples RCC Sampling DeepConf (a) DeepSeek-R1-8B. [0.0, 0.1] (0.1, 0.2] (0.2, 0.3] (0.3, 0.4] (0.4, 0.5] (0.5, 0.6] (0.6, 0.7] (0.7, 0.8] (0.8, 0.9] (0.9, 1.0] Intrinsic Confidence Bin 0 100… view at source ↗
Figure 17
Figure 17. Figure 17: Baseline confidence-bin support on LegalBench. [PITH_FULL_IMAGE:figures/full_fig_p029_17.png] view at source ↗
Figure 18
Figure 18. Figure 18: Baseline confidence-bin support on MuSR. [PITH_FULL_IMAGE:figures/full_fig_p029_18.png] view at source ↗
Figure 19
Figure 19. Figure 19: Baseline confidence-bin support on SuperGPQA. [PITH_FULL_IMAGE:figures/full_fig_p033_19.png] view at source ↗
Figure 20
Figure 20. Figure 20: DeepConf faithfulness trajectories for instruction-tuned models and reasoning-tuned [PITH_FULL_IMAGE:figures/full_fig_p033_20.png] view at source ↗
Figure 21
Figure 21. Figure 21: PCA visualization of dataset-level cMFG∗ vectors. Each point corresponds to a model– dataset pair. Colors denote model family, markers denote datasets, and cluster labels are obtained with KMeans. 33 [PITH_FULL_IMAGE:figures/full_fig_p033_21.png] view at source ↗
Figure 22
Figure 22. Figure 22: Average continuous trace-signal values by intrinsic-confidence estimator. Sampling [PITH_FULL_IMAGE:figures/full_fig_p034_22.png] view at source ↗
Figure 23
Figure 23. Figure 23: Trace-level relationship between final confidence and trace faithfulness. Each point [PITH_FULL_IMAGE:figures/full_fig_p034_23.png] view at source ↗
Figure 24
Figure 24. Figure 24: Faithfulness–length density on AIME under the baseline prompt. DeepSeek-R1-8B is [PITH_FULL_IMAGE:figures/full_fig_p034_24.png] view at source ↗
Figure 25
Figure 25. Figure 25: Faithfulness–length density on HLE under the baseline prompt. DeepSeek-R1-8B shows a [PITH_FULL_IMAGE:figures/full_fig_p035_25.png] view at source ↗
Figure 26
Figure 26. Figure 26: Faithfulness–length diagnostics on LegalBench under the baseline prompt. LegalBench [PITH_FULL_IMAGE:figures/full_fig_p035_26.png] view at source ↗
Figure 27
Figure 27. Figure 27: Faithfulness–length diagnostics on MuSR under the baseline prompt. MuSR traces occupy [PITH_FULL_IMAGE:figures/full_fig_p035_27.png] view at source ↗
Figure 28
Figure 28. Figure 28: Faithfulness–length density on SuperGPQA under the baseline prompt. DeepSeek-R1-8B [PITH_FULL_IMAGE:figures/full_fig_p035_28.png] view at source ↗
read the original abstract

Reliable uncertainty communication is critical to the trustworthiness of LLMs, yet faithful calibration (FC)--the alignment between models' intrinsic and (linguistically) expressed confidence--is a persistent failure mode. This challenge is key for large reasoning models (LRMs), whose extended reasoning traces are often interpreted by users as evidence of deliberation, competence, and confidence. Despite the importance of FC and wide usage of LRMs, the extent to which LRMs can faithfully express their confidence remains poorly understood. Moreover, the prevailing paradigm to measure FC does not generalize well to the long chain-of-thought outputs generated by LRMs, which tend to lack clear step boundaries, involve inconsistent step structure, and encode complex conditional dependencies throughout the trace--complicating estimation of intrinsic confidence. To address this challenge, we introduce a novel framework to systematically quantify FC of LRMs. Our framework analyzes linguistic decisiveness relative to three sources of internal uncertainty, based on token probabilities, hidden states, and sampled response consistency. We also devise a prefix-conditioned sampling approach to control for conditional and structural variation across traces. Applying our framework to a diverse suite of leading models, datasets, and prompts, we find that faithful confidence expression is a significant challenge for LRMs. Reasoning behaviors do not automatically translate to improved FC, and prompt interventions for non-reasoning models do not improve faithfulness in the reasoning setting. Different confidence estimators further produce divergent assessments of the same traces, revealing fragility in prior evaluation methodologies. Taken together, our work establishes FC as a distinct reliability and alignment target for LRMs, particularly as such systems are increasingly deployed in high-stakes contexts.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 2 minor

Summary. The paper claims that faithful confidence expression (FC) remains a significant challenge for large reasoning models (LRMs) despite their extended chain-of-thought traces. It introduces a framework that measures linguistic decisiveness against three internal uncertainty sources (token probabilities, hidden states, and sampled response consistency) and employs prefix-conditioned sampling to handle variable trace structure and conditional dependencies. Experiments across models, datasets, and prompts show that reasoning behaviors do not improve FC, prompt interventions effective for non-reasoning models fail to transfer, and different estimators yield divergent assessments of the same traces.

Significance. If the proxy measurements are valid, the work establishes FC as a distinct reliability target for LRMs in high-stakes deployment, separate from general reasoning capability. The framework's handling of long, unstructured traces addresses a methodological gap in prior calibration studies, and the finding of estimator fragility highlights limitations in existing evaluation approaches.

major comments (3)
  1. [§3] §3 (Framework): The central claim of poor FC rests on treating the joint distribution over token probabilities, hidden-state aggregates, and prefix-conditioned consistency samples as a reliable proxy for the model's intrinsic epistemic uncertainty about the final answer. In traces flagged by the authors as lacking clear boundaries and containing conditional dependencies, these signals may capture only local or entangled uncertainty; without an explicit validation (e.g., correlation with downstream correctness or an external oracle), misalignment with linguistic decisiveness could be measurement artifact rather than evidence of a faithfulness deficit.
  2. [§5] §5 (Results on estimator divergence): The observation that different confidence estimators produce divergent FC assessments is presented as evidence of fragility in prior methodologies. However, this same divergence undermines the robustness of the paper's own primary conclusions unless the authors demonstrate which estimator (or combination) best tracks correctness on the evaluated tasks; the current presentation leaves open whether the reported poor FC is estimator-specific.
  3. [§4.3] §4.3 (Prefix-conditioned sampling): The method is introduced to control for structural variation, yet the paper does not report an ablation showing that the controlled samples materially change the FC estimates relative to unconditional sampling. If the prefix conditioning does not demonstrably reduce the entanglement noted in the skeptic's concern, the control may be insufficient to support the claim that reasoning traces exhibit intrinsically poor faithfulness.
minor comments (2)
  1. [Abstract] The abstract and introduction would benefit from one or two concrete quantitative examples (e.g., a specific FC score or divergence value) to ground the high-level claims before the reader reaches the methods.
  2. [§3] Notation for the three uncertainty sources is introduced without an explicit summary table; a small table listing each source, its mathematical definition, and how linguistic decisiveness is compared would improve readability.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for their constructive comments, which help clarify the scope and robustness of our framework. We address each major comment below and outline planned revisions where appropriate.

read point-by-point responses

  1. Referee: [§3] §3 (Framework): The central claim of poor FC rests on treating the joint distribution over token probabilities, hidden-state aggregates, and prefix-conditioned consistency samples as a reliable proxy for the model's intrinsic epistemic uncertainty about the final answer. In traces flagged by the authors as lacking clear boundaries and containing conditional dependencies, these signals may capture only local or entangled uncertainty; without an explicit validation (e.g., correlation with downstream correctness or an external oracle), misalignment with linguistic decisiveness could be measurement artifact rather than evidence of a faithfulness deficit.

    Authors: We agree that explicit validation against downstream correctness would strengthen the interpretation. Our proxies follow standard practice in calibration literature, where token probabilities, hidden-state norms, and consistency under sampling are treated as indicators of internal uncertainty. The core claim is that linguistic decisiveness fails to align with these signals, which we interpret as a faithfulness gap by definition. To address the concern directly, we will add a new subsection discussing the choice of proxies, their known limitations in long traces, and a supplementary correlation analysis with answer correctness on a subset of tasks. This will clarify that the observed misalignment is not solely an artifact. revision: partial

  2. Referee: [§5] §5 (Results on estimator divergence): The observation that different confidence estimators produce divergent FC assessments is presented as evidence of fragility in prior methodologies. However, this same divergence undermines the robustness of the paper's own primary conclusions unless the authors demonstrate which estimator (or combination) best tracks correctness on the evaluated tasks; the current presentation leaves open whether the reported poor FC is estimator-specific.

    Authors: The divergence is reported precisely to demonstrate fragility in existing evaluation approaches, as stated in the abstract and §5. Across all three estimators, we observe consistent poor alignment between linguistic decisiveness and internal signals, supporting the claim that FC remains a challenge independent of any single estimator. We will revise §5 to explicitly state that the poor-FC finding holds across estimators (with quantitative support) and add a brief analysis showing that no single estimator reverses the overall conclusion of misalignment. This removes ambiguity about estimator-specificity. revision: partial

  3. Referee: [§4.3] §4.3 (Prefix-conditioned sampling): The method is introduced to control for structural variation, yet the paper does not report an ablation showing that the controlled samples materially change the FC estimates relative to unconditional sampling. If the prefix conditioning does not demonstrably reduce the entanglement noted in the skeptic's concern, the control may be insufficient to support the claim that reasoning traces exhibit intrinsically poor faithfulness.

    Authors: We acknowledge that an explicit ablation comparing prefix-conditioned versus unconditional sampling is missing and would directly address this concern. We will add this ablation in the revised §4.3 (and corresponding appendix), reporting the difference in FC scores and entanglement metrics. Preliminary internal checks indicate that prefix conditioning does reduce variance attributable to structural differences, but we will include the full results to substantiate the method's contribution. revision: yes

Circularity Check

0 steps flagged

No circularity detected in framework or claims

full rationale

The paper introduces a measurement framework that compares linguistic decisiveness against three separately motivated internal uncertainty signals (token probabilities, hidden states, and response consistency) plus a prefix-conditioned sampling control. None of these reduce to each other by definition, nor are any presented as fitted parameters that are then relabeled as predictions. No self-citation chains, uniqueness theorems, or ansatzes imported from prior author work appear as load-bearing steps in the abstract or described methodology. The derivation therefore remains self-contained and does not collapse to its inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Abstract-only review provides no explicit free parameters, axioms, or invented entities; the framework implicitly assumes the chosen uncertainty sources are valid proxies.

axioms (1)
  • domain assumption Linguistic decisiveness in reasoning traces can be aligned with internal model uncertainty sources
    Central premise of the proposed quantification framework.

pith-pipeline@v0.9.1-grok · 5831 in / 1215 out tokens · 26086 ms · 2026-06-28T10:20:22.961940+00:00 · methodology

discussion (0)

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