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Katherine Tian, Eric Mitchell, Allan Zhou, Archit Sharma, Rafael Rafailov, Huaxiu Yao, Chelsea Finn, Christopher D · 2023

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cs.CL 1

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2026 1

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UNVERDICTED 1

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The First Token Knows: Single-Decode Confidence for Hallucination Detection

cs.CL · 2026-05-06 · unverdicted · novelty 7.0

First-token normalized entropy (phi_first) from one greedy decode reaches mean AUROC 0.820 for hallucination detection, matching or exceeding semantic self-consistency (0.793) and surface self-consistency (0.791) across three 7-8B models and two benchmarks.

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  • The First Token Knows: Single-Decode Confidence for Hallucination Detection cs.CL · 2026-05-06 · unverdicted · none · ref 5

    First-token normalized entropy (phi_first) from one greedy decode reaches mean AUROC 0.820 for hallucination detection, matching or exceeding semantic self-consistency (0.793) and surface self-consistency (0.791) across three 7-8B models and two benchmarks.