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Sensitive-Topic Leakage Through LLM Routing Metadata: Measurement and Mitigation

Teng-Ruei Chen
arXiv CS · Papers
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LLM routers pick a cheap or expensive model per request by its content, and many gateways and some cloud platforms can log that choice with content logging off. We measure this privacy channel beyond token counts, accounting for noisy labels and repeated prompts. We run pre-registered studies on 1.7
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