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arXiv

Pairwise tests of seven open-weight models show small models can persuade larger ones, with persuasion driven by the listener rather than the speaker

Measuring persuasion as the probabilistic shift in an agent's decision after a single exchange with a dissenting peer, the study tests seven open-weight models across three language understanding tasks and finds that receivers often abandon their initial judgment when models disagree, that neither standalone certainty nor model scale reliably predicts persuasion dynamics, and that the size of the shift depends more on the listener's susceptibility than on the speaker's persuasiveness, so persuasion patterns are pairing-specific and a small model can overturn a much larger one's judgment.