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FlexRouter 提出一种显式建模模型互补性的 LLM 路由框架，将路由建模为基于覆盖的子集选择问题，并用 Determinantal Point Processes 对模型能力与冗余进行联合建模，同时通过边缘化失败集合的目标函数直接优化答案覆盖率。在 RouterEval 基准上，该方法在域内与域外任务上以更低冗余实现了更高的覆盖率，且推理成本灵活可控。
This arXiv preprint studies the semantic dispersion of sixteen language models forming ensembles, showing that ensemble diversity is small on average and that model identity only partially explains which model is most divergent. The authors propose a per-model dissent contribution metric and find that dispersion is organized by clinical content rather than interpretive openness.