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Large Language Models (LLMs) have revolutionized natural language processing, but their varying capabilities and costs pose challenges in practical applications. LLM routing addresses this by dynamically selecting the most suitable LLM for…

Machine Learning · Computer Science 2025-09-10 Pranoy Panda , Raghav Magazine , Chaitanya Devaguptapu , Sho Takemori , Vishal Sharma

Large Language Models (LLMs) exhibit potential artificial generic intelligence recently, however, their usage is costly with high response latency. Given mixed LLMs with their own strengths and weaknesses, LLM routing aims to identify the…

Computation and Language · Computer Science 2025-02-27 Xinyuan Wang , Yanchi Liu , Wei Cheng , Xujiang Zhao , Zhengzhang Chen , Wenchao Yu , Yanjie Fu , Haifeng Chen

Large language models (LLMs) exhibit diverse response behaviors, costs, and strengths, making it challenging to select the most suitable LLM for a given user query. We study the problem of adaptive multi-LLM selection in an online setting,…

Machine Learning · Computer Science 2025-06-24 Manhin Poon , XiangXiang Dai , Xutong Liu , Fang Kong , John C. S. Lui , Jinhang Zuo

Large language models (LLMs) exhibit impressive capabilities across a wide range of tasks, yet the choice of which model to use often involves a trade-off between performance and cost. More powerful models, though effective, come with…

Machine Learning · Computer Science 2025-02-25 Isaac Ong , Amjad Almahairi , Vincent Wu , Wei-Lin Chiang , Tianhao Wu , Joseph E. Gonzalez , M Waleed Kadous , Ion Stoica

Efficient use of large language models (LLMs) is critical for deployment at scale: without adaptive routing, systems either overpay for strong models or risk poor performance from weaker ones. Selecting the right LLM for each query is…

Machine Learning · Computer Science 2025-10-10 Wang Wei , Tiankai Yang , Hongjie Chen , Yue Zhao , Franck Dernoncourt , Ryan A. Rossi , Hoda Eldardiry

As large language models (LLMs) become increasingly popular, there is a growing need to predict which out of a set of LLMs will yield a successful answer to a given query at low cost. This problem promises to become even more relevant as…

Computation and Language · Computer Science 2026-04-23 Baran Atalar , Eddie Zhang , Carlee Joe-Wong

Large language models (LLMs) are powerful tools but are often expensive to deploy at scale. LLM query routing mitigates this by dynamically assigning queries to models of varying cost and quality to obtain a desired trade-off. Prior query…

The rapid progress in machine learning (ML) has brought forth many large language models (LLMs) that excel in various tasks and areas. These LLMs come with different abilities and costs in terms of computation or pricing. Since the demand…

Machine Learning · Computer Science 2025-04-23 Quang H. Nguyen , Thinh Dao , Duy C. Hoang , Juliette Decugis , Saurav Manchanda , Nitesh V. Chawla , Khoa D. Doan

We study the problem of selecting large language models (LLMs) for user queries in settings where multiple LLM providers submit the cost of solving a query. From the users' perspective, choosing an optimal model is a sequential,…

Computer Science and Game Theory · Computer Science 2026-02-17 Pronoy Patra , Sankarshan Damle , Manisha Padala , Sujit Gujar

Bandit algorithms and Large Language Models (LLMs) have emerged as powerful tools in artificial intelligence, each addressing distinct yet complementary challenges in decision-making and natural language processing. This survey explores the…

Artificial Intelligence · Computer Science 2025-10-01 Djallel Bouneffouf , Raphael Feraud

Large language model (LLM) routing has emerged as a crucial strategy for balancing computational costs with performance by dynamically assigning queries to the most appropriate model based on query complexity. Despite recent advances…

Computation and Language · Computer Science 2025-04-11 Aly M. Kassem , Bernhard Schölkopf , Zhijing Jin

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

Large language models (LLMs) deliver superior performance but require substantial computational resources and operate with relatively low efficiency, while smaller models can efficiently handle simpler tasks with fewer resources. LLM…

Databases · Computer Science 2025-12-01 Kai Mei , Wujiang Xu , Minghao Guo , Shuhang Lin , Yongfeng Zhang

LLMs are increasingly used to design reward functions based on human preferences in Reinforcement Learning (RL). We focus on LLM-designed rewards for Restless Multi-Armed Bandits, a framework for allocating limited resources among agents.…

Machine Learning · Computer Science 2025-10-22 Shresth Verma , Niclas Boehmer , Lingkai Kong , Milind Tambe

Prompt engineering has become central to eliciting the capabilities of large language models (LLMs). At its core lies prompt selection -- efficiently identifying the most effective prompts. However, most prior investigations overlook a key…

Machine Learning · Computer Science 2026-05-15 Donghao Li , Chengshuai Shi , Weijuan Ou , Cong Shen , Jing Yang

Web-based applications such as chatbots, search engines and news recommendations continue to grow in scale and complexity with the recent surge in the adoption of LLMs. Online model selection has thus garnered increasing attention due to…

Machine Learning · Computer Science 2024-03-13 Yu Xia , Fang Kong , Tong Yu , Liya Guo , Ryan A. Rossi , Sungchul Kim , Shuai Li

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

With the widespread deployment of large language models (LLMs) such as GPT4, BART, and LLaMA, the need for a system that can intelligently select the most suitable model for specific tasks while balancing cost, latency, accuracy, and…

Machine Learning · Computer Science 2025-02-25 Deepak Babu Piskala , Vijay Raajaa , Sachin Mishra , Bruno Bozza

Large language models (LLMs) have been adopted to solve sequential decision-making tasks such as multi-armed bandits (MAB), in which an LLM is directly instructed to select the arms to pull in every iteration. However, this paradigm of…

Machine Learning · Computer Science 2025-02-04 Jiahang Sun , Zhiyong Wang , Runhan Yang , Chenjun Xiao , John C. S. Lui , Zhongxiang Dai

In real-world streaming recommender systems, user preferences evolve dynamically over time. Existing bandit-based methods treat time merely as a timestamp, neglecting its explicit relationship with user preferences and leading to suboptimal…

Machine Learning · Computer Science 2026-02-10 Chenglei Shen , Yi Zhan , Weijie Yu , Xiao Zhang , Jun Xu
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