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About this paper

Yishu Zhang, Yun Li, Daiwei Zhang

MOSAIC tests whether pathology models match tissue biology across slide and institution boundaries, rather than acquisition context. It compares a same-class tile from elsewhere with a different-class tile from the reference source, using embeddings or multimodal LLMs. On 400 CAMELYON16 cross-institution triplets, Gemini 3.1 Flash Lite scores 73.0% versus Midnight’s 64.0%; TIGER LLM scores remain below chance.

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