arXiv AI By Polydoros Giannouris, Mohsinul Kabir, Sophia Ananiadou

JANUS: Evaluating Goal-Conditioned Distortion in Factually Grounded LLM Communication

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JANUS is a benchmark that evaluates goal‑conditioned pragmatic distortion in factually grounded large language model (LLM) outputs. It contains 160 scenarios across eight domains, each offering a fixed set of favorable and adverse facts, and contrasts neutral decision support with institutional conditioning that may promote adoption or support despite potential harm. By restricting outputs to the same fact pool, JANUS isolates misleading impressions from hallucination and fabrication, revealing that current LLMs consistently exhibit goal‑conditioned distortions and lack robust safeguards against selectively misleading communication.

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