Unverified50% confidenceFactExact time
分层路由（tiered routing）常见实现形式包括基于规则的长度/困惑度阈值、用小型分类器预测查询复杂度得分、以及级联式路由（弱模型先尝试后判断是否升级）
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50%
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Long-term
Relevance
9/17/2026
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