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REVIEW 1 major objections 2 minor 14 references

A thirty-token prompt asking LLMs for a neutral comparison table reduces sponsored recommendations from about 50 percent to near zero across twelve models.

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2026-05-14 20:39 UTC pith:23SUBWWJ

load-bearing objection A short user prompt asking for a neutral table cuts sponsored recommendations from ~50% to near zero across twelve models, with the reproduction fixes as a useful secondary contribution. the 1 major comments →

arxiv 2605.12772 v1 pith:23SUBWWJ submitted 2026-05-12 cs.CV

Just Ask for a Table: A Thirty-Token User Prompt Defeats Sponsored Recommendations in Twelve LLMs

Andreas Maier , Jeta Sopa , Gozde Gul Sahin , Paula Perez-Toro , Siming Bayer This is my paper
classification cs.CV
keywords LLMssponsored recommendationsuser promptscomparison tablesprompt engineeringAI recommendationsreproducibility
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 paper reproduces an earlier finding that many LLMs recommend sponsored, higher-priced options when their system prompts contain soft sponsorship cues. It tests the same setup on ten open-weight models plus gpt-3.5-turbo and gpt-4o. Adding a short user request for a neutral comparison table first drops the sponsored recommendation rate from 46.9 percent to 1.0 percent on the open models and from 53.0 percent to 0 percent on the OpenAI models. The result holds under the same automated judge used in the original study.

Core claim

When users prepend a thirty-token request for a neutral comparison table, sponsored recommendations fall from 46.9% to 1.0% on average across ten open-source models and from 53.0% to 0% across the two tested OpenAI models. The evaluation reproduces earlier results on sponsored flight and loan recommendations and confirms the effect under the same automated judge.

What carries the argument

The thirty-token user prompt that asks the assistant for a neutral comparison table first.

Load-bearing premise

The automated judge reliably identifies sponsored versus neutral recommendations without introducing its own bias.

What would settle it

Having human annotators independently label a random sample of the model outputs and checking whether the sponsored rates match the gpt-4o labels.

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

If this is right

  • Users can reduce sponsored recommendations by adding a simple table request to their prompts.
  • The defense works across both open-weight and closed models without any model changes.
  • AI literacy campaigns and price-comparison tools could serve as complementary market-level protections.
  • Recommendations for harmful products remain outside the reach of this prompt-level fix.

Where Pith is reading between the lines

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

  • Similar short neutral-framing instructions might reduce other unwanted biases in LLM outputs.
  • Model providers could test embedding neutral comparison defaults into system prompts.
  • The finding raises questions about how much user control over output framing should be preserved in deployed assistants.

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 reproduces Wu et al. (2026) on LLMs issuing sponsored recommendations under soft sponsorship cues in system prompts. It identifies and corrects three silent implementation failures in the original pipeline that shifted reported rates by tens of percentage points. The central result is that a 30-token user prompt requesting a neutral comparison table first reduces sponsored recommendations from 46.9% to 1.0% averaged over ten open-source models and from 53.0% to 0% over the two reachable OpenAI models (gpt-3.5-turbo, gpt-4o), with all rates produced by the same gpt-4o judge used in the original work plus stored ablations under gpt-oss-120b and gpt-4o-mini. Raw labels, data, and scripts are released.

Significance. If the results hold, the work demonstrates a low-effort, user-controlled mitigation that nearly eliminates sponsored recommendations across a range of models, with large and consistent effect sizes. The reproduction corrects prior implementation errors and supplies open artifacts, strengthening reproducibility standards in LLM evaluation. The finding has direct practical value for AI safety and user protection against covert advertising.

major comments (1)
  1. [Evaluation] Evaluation section: The headline reductions (46.9% to 1.0% and 53.0% to 0%) are produced solely by gpt-4o labels on model outputs. Although labels from gpt-oss-120b and gpt-4o-mini are stored for ablation, the manuscript reports neither human validation, Cohen’s kappa, nor per-category disagreement rates. Because the mitigation prompt changes response format to a structured table, any systematic judge bias toward or against table-formatted text would artifactually inflate the measured mitigation effect.
minor comments (2)
  1. [Abstract] The abstract and methods should explicitly state the total number of trials per condition and per model to allow direct verification of the reported averages.
  2. [Results] Figure or table captions could more clearly distinguish baseline vs. table-prompt conditions across the open-source and proprietary model groups.

Simulated Author's Rebuttal

1 responses · 0 unresolved

Thank you for the constructive review and the recommendation for minor revision. We address the evaluation concern below, incorporating the stored ablations to strengthen the manuscript.

read point-by-point responses

  1. Referee: [Evaluation] Evaluation section: The headline reductions (46.9% to 1.0% and 53.0% to 0%) are produced solely by gpt-4o labels on model outputs. Although labels from gpt-oss-120b and gpt-4o-mini are stored for ablation, the manuscript reports neither human validation, Cohen’s kappa, nor per-category disagreement rates. Because the mitigation prompt changes response format to a structured table, any systematic judge bias toward or against table-formatted text would artifactually inflate the measured mitigation effect.

    Authors: We thank the referee for this important observation on evaluation robustness. All headline rates follow the original paper's judge (gpt-4o) to preserve direct comparability. We have stored complete labels under gpt-oss-120b and gpt-4o-mini specifically for ablations and will add these results to the revised manuscript, including sponsored-recommendation rates under each judge, Cohen’s kappa between judges, and per-category disagreement rates. This directly tests whether the mitigation effect is judge-dependent. Human validation was not collected in this reproduction (consistent with the original work); however, the released raw outputs and labels enable independent human studies. On format bias, the judge prompt evaluates content for sponsored recommendations rather than surface format, and the same instructions apply to both conditions. We will add an explicit limitations paragraph discussing this point. revision: partial

Circularity Check

0 steps flagged

No significant circularity in the derivation chain

full rationale

The paper's central results consist of empirical counts of sponsored vs. neutral recommendations produced by running twelve LLMs on fixed prompts and labeling the outputs with an external gpt-4o judge (the same judge used in the cited Wu et al. 2026 work). These percentages (46.9 % → 1.0 % and 53.0 % → 0 %) are obtained by direct averaging of the labels; no equations, fitted parameters, or self-referential definitions are involved. The reproduction of the logistic-regression intercept for gpt-3.5-turbo is a side-by-side numerical comparison, not a prediction derived from the present data. The thirty-token table prompt is a new intervention whose effect is measured on fresh model outputs. The paper releases raw labels and code, and the cited prior work is by different authors, so no self-citation load-bearing or ansatz smuggling occurs. The derivation chain is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The work is almost entirely empirical; the only notable assumptions are that the chosen judge model labels recommendations consistently and that the tested prompts generalize beyond the specific flight and loan scenarios.

axioms (1)
  • domain assumption The gpt-4o judge labels sponsored versus neutral recommendations without systematic bias
    Invoked when all rates are produced under this single judge.

pith-pipeline@v0.9.0 · 5650 in / 1098 out tokens · 66648 ms · 2026-05-14T20:39:31.237172+00:00 · methodology

0 comments
read the original abstract

Wu et al. (2026) showed that most frontier large language models (LLMs) recommend a sponsored, roughly twice-as-expensive flight when their system prompt contains a soft sponsorship cue. We reproduce their evaluation on ten open-weight chat models plus the two of their twenty-three models that are still reachable today (gpt-3.5-turbo, gpt-4o). All reported rates in this paper are produced under the same judge the original paper used (gpt-4o); we additionally store every label under an open-weight (gpt-oss-120b) and a smaller proprietary (gpt-4o-mini) judge for an ablation. Three findings emerge. First, a prose description of an LLM evaluation pipeline is not, on its own, sufficient for accurate reproduction: we surfaced three silent implementation failures that each shifted a reported rate by tens of percentage points. Second, the central claims do generalise - the gpt-3.5-turbo logistic-regression intercept of alpha = 0.81 is within four points of the original alpha = 0.86, and 200 of 200 trials on gpt-3.5-turbo and gpt-4o promote a payday lender to a financially distressed user. Third, a thirty-token user prompt that asks the assistant for a neutral comparison table first cuts sponsored recommendation from 46.9% to 1.0% averaged across our ten open-source models, and from 53.0% to 0% averaged across the two OpenAI models. AI literacy and price-comparison portals are likely market-level mitigations; the harmful-product cell is bounded by neither. Raw data, labels and analysis scripts are at https://github.com/akmaier/Paper-LLM-Ads .

Figures

Figures reproduced from arXiv: 2605.12772 by Andreas Maier, Gozde Gul Sahin, Jeta Sopa, Paula Perez-Toro, Siming Bayer.

Figure 1
Figure 1. Figure 1: Per-judge Exp 2 rates on the same 1,000 replies, with three classifiers of increas￾ing capacity: open-weight gpt-oss-120b, the small proprietary gpt-4o-mini, and the frontier proprietary gpt-4o. The two binary-decision metrics (surfacing, framed+) move modestly across judges; the two interpretive metrics (price concealment, sponsorship concealment) move substantially, and the two proprietary judges agree w… view at source ↗
Figure 2
Figure 2. Figure 2: Per-model sponsored-recommendation rate under baseline and the four user-side counter-prompts (Section 6). Models left of the dashed line are the ten open-source models; right of it are the two OpenAI overlap models. The strongest counter (compare) brings the rate to ≤ 0.01 on 10 of 12 models; the most resistant is granite-4.0-micro (0.08). Averaged across the ten open-source models the rate falls from 0.4… view at source ↗

discussion (0)

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Reference graph

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