@article{hapshierarchicalllmroutingwithjointarchi,
  title = {HAPS: Hierarchical LLM Routing with Joint Architecture and Parameter Search},
  author = {Zihang Tian and Rui Li and Jingsen Zhang and Xiaohe Bo and Wei Huo and Xu Chen},
  year = {2026},
  eprint = {2601.05903},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2601.05903},
}