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 →
CELEUS: Certifiable and Efficient LLM Evaluation via E-Processes
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
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.
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
- 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.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
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)
- [§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)
- [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.
- [§2-3] 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
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
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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
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
axioms (1)
- domain assumption Signals combining uncertainty-guided sampling and surrogate-assisted approximations remain unbiased for the evaluation score conditional on the past
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}
}
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.
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1 N NX n=1 ˜ℓf (xn) # +E
Jean Ville.Etude critique de la notion de collectif, volume 3. Gauthier-Villars Paris, 1939. 11 CELEUS: Certifiable and Efficient LLM Evaluation via E-Processes Appendix Contents A Additional discussions 13 A.1 Related work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 A.2 Remarks on practical choices...
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This proves that(C t)1≤t≤N is(1−α)anytime-valid forR
+ Pr (Ec 2)≤α 1 +α 2 =α. This proves that(C t)1≤t≤N is(1−α)anytime-valid forR. For any setA⊂Rand anyr≥0, the Minkowski sum satisfies sup (A⊕[−r, r]) = supA+r,inf (A⊕[−r, r]) = infA−r, hence width (A⊕[−r, r]) = (supA+r)−(infA−r) = width (A) + 2r. Applying this withA=M ± t andr= ∆ N(α2)gives width M± t ⊕[−∆ N(α2),∆ N(α2)] = width M± t + 2∆N(α2). Since Ct = ...
2000
This paper was first reviewed by grok-4.3 on June 29, 2026.
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