Evaluating Agentic Search with Agent-as-a-Judge *Equal Contribution. Mind2Web 2 features realistic and diverse long-horizon web search tasks and a novel Agent-as-a-Judge framework to evaluate complex, time-varying, and citation-backed answers. Overview We introduce **Mind2Web 2**, a benchmark of **130 realistic, high-quality, long-horizon tasks** that require real-time web browsing and extensive information synthesis, constructed with **over 1,000 hours of human labor**.