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Large language model (LLM) query routers are critical to modern AI platforms as they seek to improve efficiency by assigning inference queries to accurate, yet low-cost models. Parametric routers typically use trained neural networks for…

Machine Learning · Computer Science 2025-10-14 Shivam Patel , Neharika Jali , Ankur Mallick , Gauri Joshi

Recent advances in large language models (LLMs) have expanded the context window to beyond 128K tokens, enabling long-document understanding and multi-source reasoning. A key challenge, however, lies in choosing between retrieval-augmented…

Computation and Language · Computer Science 2026-05-13 Yiwen Chen , Kuan Li , Fuzhen Zhuang , Deqing Wang , Zhao Zhang , Liwen Zhang , Yong Jiang , Shuai Wang , Minhao Cheng

Multi-turn dialogue is the predominant form of interaction with large language models (LLMs). While LLM routing is effective in single-turn settings, existing methods fail to maximize cumulative performance in multi-turn dialogue due to…

Computation and Language · Computer Science 2026-04-15 Jiarui Zhang , Xiangyu Liu , Yong Hu , Chaoyue Niu , Hang Zeng , Shaojie Tang , Fan Wu , Guihai Chen

Multi-agent systems (MAS) powered by Large Language Models (LLMs) have been demonstrated to push the boundaries of LLM capabilities, yet they often incur significant costs and face challenges in dynamic LLM selection. Current LLM routing…

Machine Learning · Computer Science 2025-02-18 Yanwei Yue , Guibin Zhang , Boyang Liu , Guancheng Wan , Kun Wang , Dawei Cheng , Yiyan Qi

Recently, the number of off-the-shelf Large Language Models (LLMs) has exploded with many open-source options. This creates a diverse landscape regarding both serving options (e.g., inference on local hardware vs remote LLM APIs) and model…

Machine Learning · Computer Science 2024-12-18 Dimitrios Sikeridis , Dennis Ramdass , Pranay Pareek

Routing large language models (LLMs) is a new paradigm that uses a router to recommend the best LLM from a pool of candidates for a given input. In this paper, our comprehensive analysis with more than 8,500 LLMs reveals a novel model-level…

Computation and Language · Computer Science 2025-05-21 Zhongzhan Huang , Guoming Ling , Yupei Lin , Yandong Chen , Shanshan Zhong , Hefeng Wu , Liang Lin

Efficiently routing queries to the optimal large language model (LLM) is crucial for optimizing the cost-performance trade-off in multi-model systems. However, most existing routers rely on single-model selection, making them susceptible to…

Machine Learning · Computer Science 2026-03-10 Sai Hao , Hao Zeng , Hongxin Wei , Bingyi Jing

Model routing is a simple technique for reducing the inference cost of large language models (LLMs), wherein one maintains a pool of candidate LLMs, and learns to route each prompt to the smallest feasible LLM. Existing works focus on…

Recently, large language models (LLMs) have notably positioned them as capable tools for addressing complex optimization challenges. Despite this recognition, a predominant limitation of existing LLM-based optimization methods is their…

Artificial Intelligence · Computer Science 2024-03-05 Yuxiao Huang , Wenjie Zhang , Liang Feng , Xingyu Wu , Kay Chen Tan

Multimodal Large Language Models (MLLMs) have demonstrated remarkable proficiency in multimodal tasks. Despite their impressive performance, MLLMs suffer from the modality imbalance issue, where visual information is often underutilized…

Computer Vision and Pattern Recognition · Computer Science 2025-12-09 Hengzhuang Li , Xinsong Zhang , Qiming Peng , Bin Luo , Han Hu , Dengyang Jiang , Han-Jia Ye , Teng Zhang , Hai Jin

In the evolving landscape of transportation systems, integrating Large Language Models (LLMs) offers a promising frontier for advancing intelligent decision-making across various applications. This paper introduces a novel 3-dimensional…

Machine Learning · Computer Science 2024-12-17 Dexter Le , Aybars Yunusoglu , Karn Tiwari , Murat Isik , I. Can Dikmen

Recent works show that assembling multiple off-the-shelf large language models (LLMs) can harness their complementary abilities. To achieve this, routing is a promising method, which learns a router to select the most suitable LLM for each…

Machine Learning · Computer Science 2024-10-01 Shuhao Chen , Weisen Jiang , Baijiong Lin , James T. Kwok , Yu Zhang

The rapidly growing number and variety of Large Language Models (LLMs) present significant challenges in efficiently selecting the appropriate LLM for a given query, especially considering the trade-offs between performance and…

Artificial Intelligence · Computer Science 2025-03-18 Tao Feng , Yanzhen Shen , Jiaxuan You

In the past year, Multimodal Large Language Models (MLLMs) have demonstrated remarkable performance in tasks such as visual question answering, visual understanding and reasoning. However, the extensive model size and high training and…

Computer Vision and Pattern Recognition · Computer Science 2026-01-23 Yizhang Jin , Jian Li , Yexin Liu , Tianjun Gu , Kai Wu , Zhengkai Jiang , Muyang He , Bo Zhao , Xin Tan , Zhenye Gan , Yabiao Wang , Chengjie Wang , Lizhuang Ma

The rapid growth of large language models (LLMs) with diverse capabilities, costs, and domains has created a critical need for intelligent model selection at inference time. While smaller models suffice for routine queries, complex tasks…

Networking and Internet Architecture · Computer Science 2026-04-22 Yasmin Moslem , John D. Kelleher

LLM routing aims to achieve a favorable quality--cost trade-off by dynamically assigning easy queries to smaller models and harder queries to stronger ones. However, across both unimodal and multimodal settings, we uncover a pervasive yet…

Artificial Intelligence · Computer Science 2026-02-04 Guannan Lai , Han-Jia Ye

Large Language Models (LLMs) have experienced widespread adoption across scientific and industrial domains due to their versatility and utility for diverse tasks. Nevertheless, deploying and serving these models at scale with optimal…

Computation and Language · Computer Science 2024-10-10 Josef Pichlmeier , Philipp Ross , Andre Luckow

Large Language Model (LLM)-based systems, i.e. interconnected elements that include an LLM as a central component, such as conversational agents, are usually designed with monolithic, static architectures that rely on a single,…

Artificial Intelligence · Computer Science 2025-07-22 Clovis Varangot-Reille , Christophe Bouvard , Antoine Gourru , Mathieu Ciancone , Marion Schaeffer , François Jacquenet

Large language models (LLMs) achieve strong performance in long-horizon decision-making tasks through multi-step interaction and reasoning at test time. While practitioners commonly believe a higher task success rate necessitates the use of…

Artificial Intelligence · Computer Science 2026-05-15 Yuanzhe Li , Jianing Deng , Jingtong Hu , Tianlong Chen , Song Wang , Huanrui Yang

The rapid emergence of diverse large language models (LLMs) has spurred the development of LLM routers that assign user queries to the most suitable model. However, existing LLM routers typically perform a single-round, one-to-one mapping…

Computation and Language · Computer Science 2025-10-27 Haozhen Zhang , Tao Feng , Jiaxuan You