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SWRouter: Similarity-Contractive Window Routing for Multi-Turn Large Language Model Conversations

arXiv · AI, language, vision and robotics · article · Sep 10, 2026 · UTC

Large language models exhibit complementary strengths, motivating routing methods that dispatch each query to the most suitable model. Although existing routers are effective in single-turn settings, they do not directly transfer to multi-turn dialogue, where routing performance critically depends on how historical context is segmented, retained, and incorporated into the current prompt. This introduces two fundamental challenges: preventing information loss and information confusion during context construction, and evaluating routing quality without conflating model selection with prompt cons

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