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Research2026-06-15 · source-backed

ClinHallu locates where in a reasoning chain a model hallucinates, not just whether it did.

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This benchmark diagnoses the specific step where a medical multimodal LLM goes wrong, instead of only scoring the final answer (arXiv 2606.14697). The stage-wise framing is the transferable idea. Pinpointing the failing reasoning step generalizes to any high-stakes multi-step pipeline, clinical or not. Final-answer evals tell you that something broke. Stage-wise evals tell you where, which is what you need to actually fix it.

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2026-06-15-clinhallu-locates-where-in-a-reasoning-chain-a-model-hallucinates-not-just-whether-it-did
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source-backed, canonical briefing excerpt