REVIEW
Open Benchmark of AI Impact on Humans (ImpactBench): an expert-guided, open platform for the holistic evaluation of AI impact on humans
Human-Computer Interaction · Submitted 14 Oct 2026 · 151 references
Pith's verdict: A massive, well-executed benchmarking infrastructure for AI human impact, but the judge-model conflict is a load-bearing flaw that needs addressing before the numerical results can be fully trusted.
T0 · AI review
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Referee report
The paper
The paper claims
ImpactBench evaluates 10 frontier LLMs across 809 metrics of human flourishing and finds a persistent gap: models promote good behaviors in 68.7% of cases but avoid harm in only 53.1%.
The reading
What carries the argument
The ImpactBench evaluation pipeline converts expert-identified constructs and existing benchmark criteria into standardized behavioral metrics, each specifying a target behavior and a polarity (positive: desirable behavior present, or negative: harmful behavior absent). For each metric, a generator creates three base scenarios with demographic variants (teen and adult), which drive a user simulator (Claude Sonnet 5) through guided multi-turn conversations with the target model. A judge model (GPT-5.6 Luna) then determines whether the target behavior occurred in the conversation. The pipeline incorporates scenario quality checks, simulator realism ratings, judge repeatability tests, and human expert validation to assess measurement reliability.
Extended reading notes
Core claim
Across 48,540 simulated conversations covering 809 metrics from 26 benchmarks, ten frontier LLMs passed positive metrics (desirable behavior present) 68.7% of the time but passed negative metrics (harmful behavior absent) only 53.1% of the time. This asymmetry was largest in the psychological domain (24.2 percentage points) and most pronounced in subareas such as Learning & Skill Development, where models promoted learning behaviors in 45.9% of conversations but avoided undermining learning in only 16.3%. Models also differed far more on harm avoidance (range 29.8% to 68.4%) than on benefit promotion (59.2% to 75.1%). In teen contexts, models less often supported independent reasoning and more often displayed dependence-building behaviors than in adult contexts. External expert review found 83.3% agreement with the automated LLM judge (Cohen's kappa = 0.667), though inter-reviewer agreement on some metrics was low (Krippendorff's alpha as low as 0.121).
Load-bearing premise
The automated LLM judge (GPT-5.6 Luna) reliably identifies the presence or absence of target behaviors in conversations, and the human validation on 18 metrics (297 ratings) generalizes to the full suite of 809 metrics, despite low inter-reviewer agreement on some dimensions.
Editorial extensions
If this is right
- Evaluations of AI systems should separately measure promotion of beneficial behaviors and avoidance of harmful ones, because these are distinct dimensions of model performance that can diverge.
- Model rankings in human-impact benchmarks depend heavily on which metrics are included and how they are weighted; aggregate scores alone are misleading and should be reported alongside benchmark-level and metric-level results.
- Developers should prioritize improving harm avoidance, especially in learning, autonomy, and emotional-boundary contexts, where current models exhibit the largest gaps.
- Age-adapted evaluation reveals that models may pose unique risks to adolescent users, warranting targeted safety measures beyond those for adult users.
- The open, modular design of ImpactBench enables diverse stakeholders to contribute metrics, making the evaluation ecosystem adaptable to evolving evidence and values.
Reading between the lines
- If the behavioral patterns observed in simulation translate to real-world interactions, users of current frontier AI systems are likely experiencing frequent subtle harms related to cognitive offloading, decision substitution, and emotional dependency, even when the models appear helpful.
- The wide range in negative-metric performance across models suggests harm avoidance is a tractable engineering target; it may be possible to improve through targeted training without sacrificing helpfulness.
- ImpactBench's modular open-submission design could serve as a template for regulatory frameworks requiring independent pre-deployment evaluation of AI impact on human flourishing, analogous to clinical trials for medical interventions.
- The low inter-reviewer agreement on some metrics (e.g., scaffolded learning, alpha = 0.121) indicates a need for deeper conceptual work before those criteria are used for high-stakes decisions.
Original abstract
The present work is concerned with how to measure, at scale, the multi-dimensional impact of generative AI models on the individuals who use them. In service of this goal, we introduce the Open Benchmark of AI Impact on Humans, or ImpactBench. Our iterable and expert-guided platform evaluates whether model behaviors support or undermine an individual's wellbeing across psychological, physical, and social domains. ImpactBench translates constructs from domain experts and existing benchmarks into metrics that are grounded in actual model behavior. Success on these metrics occurs either when a model promotes expert-defined desirable behaviors or avoids identified harms. Models are evaluated against these metrics in simulated multi-turn conversations using matched teen and adult scenarios. The conversations are then scored by an LLM judge and verified through reliability audits and human expert review. The current suite delivers 809 metrics drawn from 26 benchmarks. We evaluated ten frontier LLMs against these metrics across 48,540 conversations. Our results indicate that models promoted desirable behaviors in 68.7% of evaluations, but avoided harms in only 53.1%. Majority expert ratings agreed with the automated judge in 83.3% of reviewed cases (Cohen's Kappa = 0.667). Results are released through a public platform that keep aggregate scores traceable to the underlying metrics and transcripts. ImpactBench is intended as evolving infrastructure for independent, transparent evaluation of generative AI's multi-dimensional impact on humans.
The compiled record
The paper's own sentences, arranged, kept beside the review and separate from it. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
The abstract, sentence by sentence
The present work is concerned with how to measure, at scale, the multi-dimensional impact of generative AI models on the individuals who use them. In service of this goal, we introduce the Open Benchmark of AI Impact on Humans, or ImpactBench. Our iterable and expert-guided platform evaluates whether model behaviors support or undermine an individual's wellbeing across psychological, physical, and social domains. ImpactBench translates constructs from domain experts and existing benchmarks into metrics that are grounded in actual model behavior. Success on these metrics occurs either when a model promotes expert-defined desirable behaviors or avoids identified harms. Models are evaluated against these metrics in simulated multi-turn conversations using matched teen and adult scenarios. The conversations are then scored by an LLM judge and verified through reliability audits and human expert review. The current suite delivers 809 metrics drawn from 26 benchmarks. We evaluated ten frontier LLMs against these metrics across 48,540 conversations. Our results indicate that models promoted desirable behaviors in 68.7% of evaluations, but avoided harms in only 53.1%. Majority expert ratings agreed with the automated judge in 83.3% of reviewed cases (Cohen's Kappa = 0.667). Results are released through a public platform that keep aggregate scores traceable to the underlying metrics and transcripts. ImpactBench is intended as evolving infrastructure for independent, transparent evaluation of generative AI's multi-dimensional impact on humans.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The present work is concerned with how to measure, at scale, the multi-dimensional impact of generative AI models on the individuals who use them. | background 0.93 | 0.16 | 0.03 | asserted 0.77 |
| s1 | In service of this goal, we introduce the Open Benchmark of AI Impact on Humans, or ImpactBench. | contribution 1.00 | 0.87 | 0.02 | asserted 0.98 |
| s2 | Our iterable and expert-guided platform evaluates whether model behaviors support or undermine an individual's wellbeing across psychological, physical, and social domains. | contribution 0.68 | 0.76 | 0.05 | asserted 1.00 |
| s3 | ImpactBench translates constructs from domain experts and existing benchmarks into metrics that are grounded in actual model behavior. | method 0.90 | 0.84 | 0.03 | asserted 1.00 |
| s4 | Success on these metrics occurs either when a model promotes expert-defined desirable behaviors or avoids identified harms. | method 0.89 | 0.22 | 0.05 | asserted 1.00 |
| s5 | Models are evaluated against these metrics in simulated multi-turn conversations using matched teen and adult scenarios. | method 1.00 | 0.83 | 0.02 | asserted 1.00 |
| s6 | The conversations are then scored by an LLM judge and verified through reliability audits and human expert review. | method 1.00 | 0.89 | 0.02 | asserted 1.00 |
| s7 | The current suite delivers 809 metrics drawn from 26 benchmarks. | method 0.61 | 0.84 | 0.03 | asserted 1.00 |
| s8 | We evaluated ten frontier LLMs against these metrics across 48,540 conversations. | method 0.84 | 0.97 | 0.03 | asserted 1.00 |
| s9 | Our results indicate that models promoted desirable behaviors in 68.7% of evaluations, but avoided harms in only 53.1%. | result 1.00 | 0.97 | 0.57 | hedged possibility 0.84 |
| s10 | Majority expert ratings agreed with the automated judge in 83.3% of reviewed cases (Cohen's Kappa = 0.667). | result 0.99 | 0.96 | 0.07 | asserted 1.00 |
| s11 | Results are released through a public platform that keep aggregate scores traceable to the underlying metrics and transcripts. | contribution 0.75 | 0.85 | 0.03 | asserted 1.00 |
| s12 | ImpactBench is intended as evolving infrastructure for independent, transparent evaluation of generative AI's multi-dimensional impact on humans. | future work 0.94 | 0.22 | 0.07 | asserted 0.84 |
What was examined, and what was not
- arXiv listing abstract v1
- full text
- figures and tables
- references and citing sentences
- relations to other papers
- P abstract
- S sections
- T body sentences
- C citations
- R cross-paper relations
Figures
Figures reproduced from arXiv:2610.20690 by the authors.
References
Discussion
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