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arxiv: 2607.02032 · v1 · pith:DFVOPTSXnew · submitted 2026-07-02 · 💻 cs.AI · cs.CL

PACE: A Proxy for Agentic Capability Evaluation

Pith reviewed 2026-07-03 13:31 UTC · model grok-4.3

classification 💻 cs.AI cs.CL
keywords agentic benchmarksproxy evaluationperformance predictionLLM agentsnon-agentic benchmarksinstance selectionregression mappingevaluation cost reduction
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The pith

A small curated subset of non-agentic tests can predict LLM agent performance on expensive benchmarks via regression.

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

Evaluating agents on benchmarks like SWE-Bench and GAIA requires complex infrastructure and high cost, whereas non-agentic tests for isolated skills run quickly and cheaply. The paper shows that a data-driven selection of instances from a pool of non-agentic benchmarks can serve as a reliable proxy whose scores map to agentic scores through a fitted regression. The selection combines local relevance to the target with global informativeness across models. This yields accurate forecasts at a fraction of the original evaluation expense, supporting repeated checks during model development.

Core claim

PACE constructs proxy benchmarks by selecting instances from existing non-agentic evaluations whose aggregate scores most reliably predict model performances on agentic benchmarks. It fits a regression that maps a model's scores on a compact subset of source instances to its score on the target agentic benchmark, using target-relevance local selection and globally informative global selection to curate the subset. Experiments across 14 models, 4 agentic benchmarks, and 19 non-agentic benchmarks show that the resulting PACE-Bench predicts agentic scores with leave-one-out cross-validation mean absolute error under 4%, Spearman correlation above 0.80, and pairwise model-ranking accuracy around

What carries the argument

PACE framework, which curates a compact subset of atomic instances from non-agentic benchmarks via local and global selection strategies and fits a regression to map subset scores to agentic benchmark scores.

If this is right

  • Proxy benchmarks allow reliable estimates of agentic performance at under 1% of full evaluation cost during model development.
  • The selected instances reveal which atomic skills each agentic benchmark uniquely demands.
  • The same proxy supports model selection and routing decisions without running complete agent evaluations.
  • Performance predictions remain stable across the tested set of 14 models with high ranking accuracy.

Where Pith is reading between the lines

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

  • If the regression generalizes, agentic tasks largely decompose into measurable atomic capabilities already covered by existing non-agentic tests.
  • The method could be re-applied to additional agentic targets or new non-agentic pools to create domain-specific proxies.
  • Future models whose capability distributions differ markedly from the training set may require fresh instance selection to maintain accuracy.

Load-bearing premise

That a regression fitted on scores from the selected non-agentic instances will generalize to predict agentic benchmark performance for new models.

What would settle it

Apply the fitted PACE-Bench regression to a new model outside the original 14 and measure whether the absolute error on an agentic benchmark exceeds 4% on average.

Figures

Figures reproduced from arXiv: 2607.02032 by Aditya Bharat Soni, Daniel Lee, Graham Neubig, Jiarui Liu, Jiayi Geng, Lindia Tjuatja, Lintang Sutawika, Vincent Lo, Xiang Yue, Yueqi Song, Yunze Xiao.

Figure 1
Figure 1. Figure 1: Cost-versus-quality tradeoff of PACE (blue) and sub-sampling target agentic evals (red), averaged across four datasets. Left: mean absolute error. Middle: Spearman correlation. Right: pairwise model-ranking accuracy. At every budget below saturation, PACE dominates sub-sampling agentic evals on all three metrics, matching quality at roughly 1/100 of the cost. Submission in Progress. 1 arXiv:2607.02032v1 [c… view at source ↗
Figure 2
Figure 2. Figure 2: Overview of PACE. From a pool of non-agentic source benchmarks, two complementary filter-based criteria (Local: target relevance; Global: SVD leverage × relevance) each pick C instances; the selected scores then drive a noise-aware regression that predicts the target agentic benchmark’s mean score (Goal A) and pairwise model preferences (Goal B). PACE consists of two core components: (1) a regression that,… view at source ↗
Figure 3
Figure 3. Figure 3: Total selected instances from source benchmarks covering each ability, for [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Number of source instances selected per (target, source benchmark) pair at [PITH_FULL_IMAGE:figures/full_fig_p016_4.png] view at source ↗
read the original abstract

Evaluating LLM agents on benchmarks like SWE-Bench and GAIA can be expensive, time-consuming, and requires complex infrastructure. A single evaluation can cost thousands of dollars and take days to complete. In contrast, non-agentic LLM benchmarks that test individual capabilities (e.g., reasoning, code generation) are fast and cheap to run. In this paper, we investigate whether performance on expensive agentic benchmarks can be accurately predicted by the performance on a small, carefully selected subset of atomic evaluation instances. We introduce PACE, a framework that constructs proxy benchmarks by selecting instances from existing non-agentic evaluations whose aggregate scores most reliably predict model performances on agentic benchmarks. Given a pool of candidate instances spanning atomic capabilities, PACE fits a regression that maps a model's scores on a compact subset of source instances to its score on the target agentic benchmark. The subset itself is curated by combining two complementary instance-selection strategies, target-relevance local selection and globally informative global selection. We apply PACE to the 4 target agentic benchmarks in this paper, which yields PACE-Bench, the concrete proxy benchmark that we evaluate in the paper. Experiments across 14 models, 4 agentic benchmarks, and 19 non-agentic benchmarks show that PACE-Bench predicts agentic scores with leave-one-out cross-validation (LOOCV) mean absolute error (MAE) under 4%, Spearman correlation above 0.80, and pairwise model-ranking accuracy around 85%, all at much less than 1% of the full agentic evaluation cost. We further analyze the selected proxy instances, revealing which skills each agentic benchmark uniquely demands. PACE enables practitioners to obtain reliable estimates of agentic performance during model development, selection, and routing, without the overhead of full agent evaluation.

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

2 major / 1 minor

Summary. The paper introduces the PACE framework for constructing compact proxy benchmarks (PACE-Bench) from subsets of instances drawn from 19 non-agentic LLM evaluations. These proxies are selected via target-relevance local selection and globally informative global selection, then used to fit a regression predicting scores on four target agentic benchmarks (including SWE-Bench and GAIA). On 14 models, LOOCV yields MAE under 4%, Spearman correlation above 0.80, and ~85% pairwise ranking accuracy at <1% of full agentic evaluation cost; the paper also analyzes which atomic skills each agentic benchmark requires.

Significance. If the reported predictive accuracy generalizes to new models, PACE would materially reduce the cost and infrastructure burden of agentic evaluation, enabling faster iteration during development and routing. The skill-analysis component provides additional value by linking agentic performance to specific non-agentic capabilities. The multi-benchmark experimental design and use of LOOCV are positive features, though the strength of the central claim depends on whether selection bias is properly controlled.

major comments (2)
  1. [Abstract] Abstract and the description of the evaluation procedure: the LOOCV results (MAE <4%, Spearman >0.80, ranking accuracy ~85%) are obtained after applying the two instance-selection strategies to the pool of 14 models. The manuscript does not state whether subset selection occurs inside the leave-one-out loop or on the full model pool before CV begins. If the latter, the metrics are optimistically biased for truly unseen models and the generalization claim for new models during development is untested.
  2. [Experiments section (implied by abstract)] The regression step and selection algorithm: the abstract and experimental section provide no explicit description of the regression form (linear, regularized, etc.), the precise implementation of target-relevance local selection versus globally informative global selection, or any ablation that isolates the contribution of each strategy. These details are load-bearing for reproducing the reported correlations and for assessing whether the proxy is overfit to the particular 14-model distribution.
minor comments (1)
  1. [Abstract] The abstract should state the typical size of the selected PACE-Bench subset (number of instances) for each target benchmark to give readers an immediate sense of the cost reduction.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful and constructive review. The comments identify important issues around evaluation procedure and methodological transparency. We address each below and commit to revisions that improve rigor and reproducibility.

read point-by-point responses
  1. Referee: [Abstract] Abstract and the description of the evaluation procedure: the LOOCV results (MAE <4%, Spearman >0.80, ranking accuracy ~85%) are obtained after applying the two instance-selection strategies to the pool of 14 models. The manuscript does not state whether subset selection occurs inside the leave-one-out loop or on the full model pool before CV begins. If the latter, the metrics are optimistically biased for truly unseen models and the generalization claim for new models during development is untested.

    Authors: We appreciate this observation on potential bias. The manuscript text indicates that selection strategies were applied to the full pool of 14 models prior to LOOCV, which does create the risk of optimistic bias for truly unseen models. We will revise the Experiments section to explicitly describe the current procedure, acknowledge the limitation for generalization claims, and add results from an inner-loop selection variant (selection performed within each LOOCV fold) to quantify the difference and provide a more conservative estimate. revision: yes

  2. Referee: [Experiments section (implied by abstract)] The regression step and selection algorithm: the abstract and experimental section provide no explicit description of the regression form (linear, regularized, etc.), the precise implementation of target-relevance local selection versus globally informative global selection, or any ablation that isolates the contribution of each strategy. These details are load-bearing for reproducing the reported correlations and for assessing whether the proxy is overfit to the particular 14-model distribution.

    Authors: We agree these details are essential for reproducibility and for evaluating potential overfitting. The current manuscript omits them. In the revision we will add a dedicated Methods subsection that (a) specifies the regression form and any regularization, (b) provides precise algorithmic descriptions (including equations or pseudocode) for both selection strategies, and (c) includes ablation experiments that isolate the contribution of local versus global selection as well as comparisons to random and single-strategy baselines. revision: yes

Circularity Check

1 steps flagged

Instance selection on full 14-model pool before LOOCV creates optimistic bias in proxy performance metrics

specific steps
  1. fitted input called prediction [Abstract]
    "The subset itself is curated by combining two complementary instance-selection strategies, target-relevance local selection and globally informative global selection. ... Experiments across 14 models, 4 agentic benchmarks, and 19 non-agentic benchmarks show that PACE-Bench predicts agentic scores with leave-one-out cross-validation (LOOCV) mean absolute error (MAE) under 4%, Spearman correlation above 0.80, and pairwise model-ranking accuracy around 85%"

    The two selection strategies operate on the full set of 14 models' scores to choose instances whose aggregate best predicts the agentic targets for exactly those models. LOOCV is then applied only after this fixed subset has been chosen, so the quoted performance numbers reflect a selection process already tuned to the evaluation distribution rather than an independent prediction.

full rationale

The paper's central claim rests on curating a subset of non-agentic instances via data-driven strategies that explicitly use the 14 models' scores to predict agentic performance, then reporting LOOCV metrics on the resulting regression. Because selection occurs outside the CV loop on the same model pool used for evaluation, the reported MAE <4%, Spearman >0.80 and ranking accuracy ~85% are partially forced by the selection step rather than representing generalization to unseen models. No equations reduce by algebraic identity and no self-citation chain is load-bearing; the circularity is limited to the non-nested selection procedure.

Axiom & Free-Parameter Ledger

2 free parameters · 1 axioms · 1 invented entities

The central claim rests on fitted regression parameters, data-driven instance selection, and the domain assumption that atomic non-agentic scores suffice to predict agentic performance; no machine-checked proofs or external benchmarks are mentioned.

free parameters (2)
  • regression coefficients
    Parameters of the regression mapping proxy instance scores to agentic benchmark scores are fitted from model data.
  • selected instance subset size and composition
    The compact subset is chosen via the two selection strategies on the candidate pool.
axioms (1)
  • domain assumption Non-agentic atomic capability tests can be aggregated to predict complex agentic task performance
    The framework is built on the premise that agentic benchmarks decompose into measurable atomic skills tested in the 19 non-agentic sources.
invented entities (1)
  • PACE-Bench no independent evidence
    purpose: Concrete proxy benchmark produced by the selection and regression process
    The proxy is defined internally by the paper's curation method with no independent external validation cited.

pith-pipeline@v0.9.1-grok · 5894 in / 1498 out tokens · 67263 ms · 2026-07-03T13:31:18.992595+00:00 · methodology

discussion (0)

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