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About this paper
Mingchen Li, Jiatan Huang, Hong Yu
RIVO helps long-horizon research agents redirect unproductive searches while keeping the Host model frozen. A trained 0.6B plug-in predicts reroutes and selectively adjusts token preferences to guide the Host toward new queries. On BrowseCore, LiteResearcher-4B achieves 59.30% judged success versus 55.15% for the strongest baseline. Results favor RIVO across six settings, but do not establish efficiency gains.
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