Agentic AI systems are increasingly capable of performing professional and personal tasks with limited human involvement. However, tracking these developments is difficult because the AI agent ecosystem is complex, rapidly evolving, and inconsistently documented, posing obstacles to both researchers and policymakers. To address these challenges, this paper presents the 2025 AI Agent Index. The Index documents information regarding the origins, design, capabilities, ecosystem, and safety features of 30 state-of-the-art AI agents based on publicly available information and email correspondence with developers. In addition to documenting information about individual agents, the Index illuminates broader trends in the development of agents, their capabilities, and the level of transparency of developers. Notably, we find different transparency levels among agent developers and observe that most developers share little information about safety, evaluations, and societal impacts. The 2025 AI Agent Index is available online at https://aiagentindex.mit.edu

翻译：具备自主能力的AI系统正日益能够在有限人力介入下完成专业及个人任务。然而，由于AI智能体生态系统具有复杂性高、演进速度快、文档记录不一致等特点，追踪这些进展变得十分困难，这为研究者和政策制定者均带来了障碍。为应对这些挑战，本文提出2025年AI智能体索引。该索引基于公开信息及与开发者的邮件沟通，系统记录了30个前沿AI智能体在起源背景、架构设计、能力维度、生态系统及安全特性等方面的信息。除记录单个智能体信息外，本索引还揭示了智能体发展进程、能力演进及开发者透明度等方面的宏观趋势。值得注意的是，我们发现不同智能体开发者存在显著的透明度差异，且多数开发者对安全性评估、社会影响等信息披露极为有限。2025年AI智能体索引可通过https://aiagentindex.mit.edu在线访问。