Author

Vishnu Surya Reddy Nandi

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#artificial intelligence Preprint Sep 2026

Right Answer, Wrong Reason: Accuracy, Consistency, and Consensus Are Misleading Indicators of LLM Faithfulness in Clinical Decision Support

Clinical Large Language Models (LLMs) achieve strong medical-exam accuracy; however, a correct answer does not guarantee that the explanation names the concepts that actually drove the decision. We introduce three lightweight, directly interpretable metrics for this faithfulness gap: the Explanation Stability Index (ES...

B. Bolla, Vishnu Surya Reddy Nandi · 0 citations

#artificial intelligence Preprint Sep 2026

Beyond Accuracy: Counterfactual Fragility and Demographic Bias in Clinical Evaluation of LLMs

Clinical LLM evaluation often emphasizes answer accuracy; however, accuracy alone does not test counterfactual consistency or demographic robustness. We evaluated six LLMs on 150 MedQA USMLE questions using two automated perturbation tests to assess their performance. The counterfactual validity (CFV) test asked each m...

Chaitai Deb Purkayastha, B. Bolla, Vishnu Surya Reddy Nandi · 0 citations