text: [47] I. Ong, A. Almahairi, V. Wu, W.-L. Chiang, T. Wu, J. E. Gonzalez, M. W. Kadous, and I. Stoica, “RouteLLM: 
  Learning to route LLMs with preference data,” arXiv preprint arXiv:2406.18665, 2024. 
  
  20 