The LMSys Chatbot Arena Leaderboard is a crowdsourced open platform for evaluating the performance of Large Language Models (LLMs). It utilizes the Elo ranking system to rank LLMs based on the results of over 300,000 user votes. Users can interact with different LLMs on the website and vote on their conversational quality. This leaderboard can be used to track the development trends of different LLMs and provide benchmark testing tools for researchers and developers.