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Misleading an LLM does not require lying - omitting the adverse facts is enough

AspireAI community · arXiv
Deception benchmarks usually test fabricated claims, explicit lies or strategic concealment. This paper measures a subtler failure mode: selectively presenting true facts, by omitting adverse evidence, softening unfavourable details, emphasising favourable ones, or replacing precise qualifications with vague language. JANUS constrains every output to the same fixed pool of favourable and adverse facts, across 160 scenarios in 8 domains, and contrasts neutral decision support against institutional conditioning such as increasing adoption or supporting something despite potential harm to affected people. Because the fact pool is fixed, misleading net impressions are isolated from hallucination and fabrication. Across 12 LLMs the distortion is consistent: models stay sensitive to incentives and framing and lack robust safeguards against selectively misleading communication. The corpus and code are released.
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One distance function matched sparse-autoencoder features across layers and compressed feature circuits into supernodes
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