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Los Alamos National Laboratory's Prelim Attention Score (PAS) establishes a new state-of-the-art benchmark for detecting hallucinations in vision-language models by monitoring attention patterns during token generation. This real-time, plug-and-play metric offers developers a low-overhead solution to verify output fidelity against input images, which is critical for deploying trustworthy multimodal AI in high-stakes domains like medical imaging. By pinpointing the origin of fabricated details within the generation process, PAS provides a practical mechanism to enhance the reliability of autoregressive systems without significant computational cost.
PAS Achieves State-of-the-Art Accuracy Catching AI Hallucinations

Los Alamos’ Prelim Attention Score (PAS) tool detects inaccuracies, known as hallucinations, in vision-language models—reaching state-of-the-art.
Los Alamos National Laboratory researchers have developed a tool achieving high accuracy in detecting instances where artificial intelligence describes objects absent from an input image. The Prelim Attention Score, or PAS, offers a unique solution by monitoring autoregressive vision-language models as they generate output, pinpointing the origin of information and potential errors during the process itself. “The PAS is a real-time, plug-and-play metric that acts as an internal monitor for the AI,” explains Manish Bhattarai,…
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