AI Arena LM Arena.ailmarena.aihttps://lmarena.ai/leaderboard/Chatbot Arena (formerly LMSYS): Free AI Chat to Compare & Test Best AI Chatbotshttps://lmarena.ai/search arenaIntroducing the Search Arena: Evaluating Search-Enabled AI | LM Arenaan open platform for human preference evaluationshttps://blog.lmarena.ai/blog/2025/search-arena/