VIPER: An Expert-Curated Benchmark for Vision-Language Models in Veterinary Pathology

Luca L. Weishaupt; Simone de Brot; Javier Asin; Llorenç Grau-Roma; Nic G. Reitsam; Andrew H. Song; Dongmin Bang; Stefan T. Kaluziak; Long Phi Le; Jakob Nikolas Kather; Faisal Mahmood; Guillaume Jaume

arXiv · 2608.26382

VIPER: An Expert-Curated Benchmark for Vision-Language Models in Veterinary Pathology

Luca L. Weishaupt·Simone de Brot·Javier Asin·Llorenç Grau-Roma·Nic G. Reitsam·Andrew H. Song·Dongmin Bang·Stefan T. Kaluziak·Long Phi Le·Jakob Nikolas Kather·Faisal Mahmood·Guillaume Jaume

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Abstract

Pathology vision-language models are advancing rapidly, yet existing benchmarks remain focused on human tissue, particularly oncology, leaving non-human pathology largely unaddressed. This gap is especially important in toxicologic pathology, where microscopic tissue examination of laboratory animals is a core component of preclinical drug safety assessment. To address it, we introduce VIPER, the first expert-curated benchmark for vision-language model evaluation in toxicologic pathology. VIPER contains 1,251 questions associated with 419 H&E-stained rat histology images across seven organ systems, covering multiple-choice, KPrim, and free-text formats. All questions were curated and validated by board-certified veterinary pathologists. In total, we benchmarked 16 models, including two newly introduced veterinary-pathology models, seven human pathology-specialized models, and seven general-purpose frontier models. The results identify a substantial domain gap between veterinary and human pathology, expose the risk of over-diagnosis of normal tissue in frontier models, and show that domain-specific training remains critical for visually grounded predictions. VIPER data and evaluation code are available at https://github.com/mahmoodlab/viper.

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Luca L. Weishaupt, Simone de Brot, Javier Asin, Llorenç Grau-Roma, Nic G. Reitsam, Andrew H. Song, Dongmin Bang, Stefan T. Kaluziak, Long Phi Le, Jakob Nikolas Kather, Faisal Mahmood, Guillaume Jaume. 2026-08-26. VIPER: An Expert-Curated Benchmark for Vision-Language Models in Veterinary Pathology. https://arxiv.org/abs/2608.26382

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