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REVIEW 1 major objections 2 minor 41 references

Celeus constructs anytime-valid confidence intervals for LLM evaluation by proving that uncertainty-guided sampling signals combined with surrogate approximations remain unbiased conditional on past observations.

Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →

CELEUS applies e-processes to LLM evaluation to produce anytime-valid CIs that reach target precision with 54-62% fewer samples than baselines while preserving coverage guarantees.

T0 review reviewed 2026-06-29 challenge →

load-bearing objection Celeus applies e-processes to LLM eval for anytime-valid CIs by proving conditional unbiasedness under uncertainty sampling plus surrogates, with reported 54-62% sample cuts. the 1 major comments →

arxiv 2606.20820 v2 pith:SNLIWIGD submitted 2026-06-18 cs.LG

CELEUS: Certifiable and Efficient LLM Evaluation via E-Processes

classification cs.LG
keywords LLM evaluatione-processesanytime-valid CIsuncertainty samplingsurrogate approximationcertifiable evaluationsequential sampling
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

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

The reading

The paper aims to close the gap between theoretical guarantees and practical use in LLM evaluation by developing methods that provide valid confidence intervals even when the evaluation process adapts based on intermediate results. Existing approaches can lose their coverage guarantees if intervals are updated repeatedly to decide when to stop sampling more examples. Celeus addresses this by introducing signals that merge uncertainty-guided selection of samples with approximations for unevaluated ones, proving these signals are unbiased given the history. This unbiasedness supports the use of e-processes to form intervals that are valid at any stopping time. If correct, evaluators can confidently halt testing once a desired precision is achieved, knowing the reported interval truly covers the model's performance with the stated probability.

Core claim

The central discovery is that signals combining uncertainty-guided sampling to select informative samples for evaluation and surrogate-assisted approximations for unevaluated samples remain unbiased for the evaluation score conditional on the past. This property enables the construction of statistically-grounded and anytime-valid e-process confidence intervals. The approach also reduces estimation variance, allowing the target precision to be reached with fewer evaluated samples, and the intervals shrink at a near-parametric rate up to logarithmic factors.

What carries the argument

Unbiased signals from uncertainty-guided sampling and surrogate-assisted approximations that enable e-process based anytime-valid confidence intervals.

Load-bearing premise

The signals combining uncertainty-guided sampling to select informative samples and surrogate-assisted approximations for unevaluated samples remain unbiased for the evaluation score conditional on the past.

What would settle it

Observing that the empirical coverage of the constructed confidence intervals falls below the nominal level, such as 95%, in repeated experiments where stopping decisions are made adaptively based on the intervals.

Watch this falsifier. Get emailed when new claim-graph text bears on it.

If this is right

  • The CIs remain valid regardless of when the evaluation stops based on the intervals themselves.
  • Target precision is reached with 54-62% fewer evaluated samples than baselines.
  • Confidence intervals shrink at near-parametric rates up to logarithmic factors.
  • An oracle variance-optimal sampling rule exists that motivates the empirical uncertainty-guided approach.

Where Pith is reading between the lines

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

  • Similar unbiased signal constructions might apply to sequential testing in other machine learning tasks like model selection or hyperparameter tuning.
  • The efficiency gains could make large-scale LLM benchmarking more feasible under resource constraints.
  • If extended, this might provide a template for certifiable evaluation in non-LLM settings where adaptive sampling is used.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

1 major / 2 minor

Summary. The paper proposes CELEUS, a framework for certifiable LLM evaluation that uses e-processes to construct anytime-valid confidence intervals. It introduces composite signals that combine uncertainty-guided sampling of informative examples with surrogate-assisted approximations for unevaluated items, proves that these signals are conditionally unbiased for the evaluation score given the past, establishes near-parametric shrinkage rates (up to log factors) for the resulting CIs, and reports that the method reaches target precision with 54-62% fewer evaluated samples than baselines while preserving coverage guarantees.

Significance. If the conditional-unbiasedness claim holds, the work supplies a statistically rigorous, anytime-valid alternative to existing sequential LLM evaluation procedures. The combination of e-process theory with practical variance-reduction techniques (uncertainty sampling plus surrogates) and the reported sample savings would be a meaningful contribution to efficient, certifiable evaluation, especially given the high cost of human or model-based scoring of large test sets.

major comments (1)
  1. [§3 (proof of unbiasedness)] The central load-bearing claim is the proof that the uncertainty-guided sampling plus surrogate signals remain conditionally unbiased for the evaluation score given the past (abstract and §3). Because this property is what licenses the e-process construction and the anytime-valid coverage, the derivation must be checked in full for any dependence introduced by the sampling rule or the surrogate training that could violate the martingale property.
minor comments (2)
  1. [Experiments] The experimental section should report the precise definition of the target precision (e.g., CI width) and the stopping rule used in the anytime-valid setting so that the 54-62% reduction claim can be reproduced.
  2. [§2-3] Notation for the surrogate model and the uncertainty measure should be introduced once and used consistently; several symbols appear to be overloaded between the sampling rule and the e-process construction.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the positive assessment and recommendation for minor revision. We address the sole major comment below.

read point-by-point responses
  1. Referee: [§3 (proof of unbiasedness)] The central load-bearing claim is the proof that the uncertainty-guided sampling plus surrogate signals remain conditionally unbiased for the evaluation score given the past (abstract and §3). Because this property is what licenses the e-process construction and the anytime-valid coverage, the derivation must be checked in full for any dependence introduced by the sampling rule or the surrogate training that could violate the martingale property.

    Authors: We appreciate the referee underscoring the centrality of this property. In §3 the proof proceeds by verifying that the composite signal S_t satisfies E[S_t | ℱ_{t-1}] = heta (the target score) for the filtration ℱ_{t-1} generated by all prior evaluations and the surrogate parameters fitted on them. The uncertainty-guided sampling probabilities are ℱ_{t-1}-measurable by construction, and the surrogate approximation is likewise a deterministic function of ℱ_{t-1}. Consequently the product of the sampling indicator and the (surrogate or true) score remains a martingale difference; no extra dependence is introduced that would break the conditional unbiasedness. We have re-examined every step of the derivation and confirm it holds. In a minor revision we will insert a short paragraph after the main proof explicitly stating the measurability of each component with respect to ℱ_{t-1}. revision: partial

Circularity Check

0 steps flagged

No significant circularity identified

full rationale

The paper claims to prove that the proposed signals (uncertainty-guided sampling plus surrogate approximations) remain conditionally unbiased for the evaluation score given the past; this is presented as an independent derivation that enables the e-process CIs. No equation or step in the abstract reduces the unbiasedness claim, the variance reduction, or the near-parametric rate to a fitted parameter or self-referential definition. The method is explicitly built on external e-process theory, and the reported sample-efficiency gains are experimental. The derivation chain is therefore self-contained against the listed circularity patterns.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the property that the constructed signals are unbiased conditional on the past; this is treated as a domain assumption whose proof is asserted but not inspectable from the abstract. No free parameters or invented entities are introduced in the abstract description.

axioms (1)
  • domain assumption Signals combining uncertainty-guided sampling and surrogate-assisted approximations remain unbiased for the evaluation score conditional on the past
    This property is required for the e-process CIs to be anytime-valid; it is stated as proven in the abstract.

reviewed 2026-06-29 · how reviews work

0 comments
Cite this review

Pith. "Pith review of CELEUS: Certifiable and Efficient LLM Evaluation via E-Processes." pith.science (2026). https://pith.science/paper/SNLIWIGD

@misc{pith2026260620820,
  author       = {Pith},
  title        = {Pith review of: CELEUS: Certifiable and Efficient LLM Evaluation via E-Processes},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/SNLIWIGD}},
  note         = {Machine review of arXiv:2606.20820}
}
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abstract

Can we trust evaluation scores to capture an LLM's true real-world performance? Certifiable evaluation answers this question by providing guarantee for LLM evaluation. In particular, existing methods sequentially curate evaluation samples and keep updating confidence intervals (CIs) that cover the true performance with high probability (e.g., 95%) until some conditions are satisfied, e.g., the CI width reaches a target precision. However, existing methods are not generally anytime-valid: the claimed coverage (e.g., 95%) may fail when CIs are repeatedly updated and used to decide when to stop, leaving a gap between theoretical rigor and practice. This paper bridges this gap by proposing Celeus, a Certifiable framework for Efficient LLM evaluation, which leverages E-processes to build anytime-valid CIs. Concretely, we propose signals that combine two ingredients: (i) Uncertainty-guided sampling to select informative samples for evaluation, and (ii) Surrogate-assisted approximations for unevaluated samples. We prove that such signals remain unbiased for the evaluation score conditional on the past, enabling statistically-grounded and anytime-valid $e$-process CIs. More importantly, the two ingredients reduce estimation variance and help reach the target precision with fewer evaluated samples. We also prove that CIs obtained by Celeus can shrink at a near-parametric rate up to logarithmic factors and analyze the oracle variance-optimal sampling rule that motivates the empirical uncertainty-guided one. Experiments show that Celeus reaches the target precision using 54-62% fewer evaluated samples than baselines, while preserving anytime-valid coverage.

Figures

Figures reproduced from arXiv: 2606.20820 by Bo Li, Feng Liu, Zesheng Ye, Zhaorun Chen, Zhijian Zhou.

Figure 1
Figure 1. Figure 1: CI width versus the number of evaluated samples. Each trajectory is averaged over 50 seeds and surrogate–target pairs, with shaded bands showing ±1 standard deviation. The dashed line marks ϵ = 0.05. At the budget where ORACLE reaches ϵ, CELEUS reduces the CI-width gap between EVALUE and ORACLE by 90%/93%/84% on SST-2/MMLU/AG News, compared with 53%/60%/60% for CELEUS (W/O SURR). generation), DeepSeek-67B,… view at source ↗
Figure 2
Figure 2. Figure 2: Mechanism analysis for CELEUS, pooled across the six surrogate-target pairs. Left: empirical bias of the final estimator Rˆt in Eqn. (4) versus the unweighted estimator that removes um,t. Middle: MSE of the proposed signal Sˆt in Eqn. (1) versus the naive single-step observed risk of the newly evaluated sample. Right: Var(Sˆt | Ft−1) under uniform sampling, CELEUS’s uncertainty-guided sampling, and the ora… view at source ↗
Figure 3
Figure 3. Figure 3: Confidence interval width versus number of evaluated samples under cross-entropy loss on SST-2, MMLU, and AG News. Each curve is the mean width at each label budget, aggregated over 50 seeds and the four surrogate-target pairs of App. D.2; the shaded band is ±1σ across the per-pair means. The dashed line marks the target precision ϵ = 0.05, and triangles mark the median samples-to-ϵ for CELEUS, which reach… view at source ↗
Figure 4
Figure 4. Figure 4: Sample-selection strategy comparison under 0-1 risk. We compare the sample-selection strategies in Rem. 1 by plotting CI width versus the number of evaluated samples on SST-2, MMLU, and AG News. Each curve is averaged over 50 seeds, and the dashed line marks the target precision ϵ = 0.05. 0-1 loss family. The strategies in Rem. 1 differ in how they approximate the oracle residual |ℓ(f(xj ), yj ) − ˜ℓf (xj … view at source ↗
Figure 5
Figure 5. Figure 5: Sample-selection strategy comparison under cross-entropy risk. We compare the sample-selection strategies in Rem. 2 by plotting CI width versus the number of evaluated samples on SST-2, MMLU, and AG News. Each curve is averaged over 50 seeds, and the dashed line marks the target precision ϵ = 0.05. same sample-selection ranking as Strategy A but a different correction term in Eqn. (4). Strategy C is the on… view at source ↗
Figure 6
Figure 6. Figure 6: Sensitivity of median samples-to-ϵ to the betting-magnitude floor β, on three benchmarks (SST-2, MMLU, AG News) and two surrogate-target pairs per benchmark. Each curve is the median number of evaluate samples used, over 50 seeds at ϵ = 0.05 under 0-1 loss. The vertical dashed line marks the deployed value β = 0.4. Curves are L-shaped on the left and either flat or mildly increasing on the right; the deplo… view at source ↗
Figure 7
Figure 7. Figure 7: Confidence interval width versus evaluated samples on each (dataset, surrogate, target) experimental configuration. Rows index the six surrogate-target pairs of App. D.2, and columns index the three benchmarks. Each curve is the mean width over 50 seeds. The dashed line marks the target precision ϵ = 0.05, and triangles mark the median samples-to-ϵ. The ordering CELEUS ≤ CELEUS (W/O SURR) ≤ EVALUE holds on… view at source ↗

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This paper was first reviewed by grok-4.3 on June 29, 2026.