On the five-source CARE-XAI benchmark, classifiers beat LLMs at verdict-only prediction, fine-tuning improves evidence-generating LLMs more than retrieval, and PubMed retrieval helps only source-aligned claims.
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When Retrieval Helps and Distracts: Evaluating Evidence-Generating LLMs for Biomedical Claim Verification
On the five-source CARE-XAI benchmark, classifiers beat LLMs at verdict-only prediction, fine-tuning improves evidence-generating LLMs more than retrieval, and PubMed retrieval helps only source-aligned claims.