Perplexity Deep Research is an advanced AI research agent that conducts thorough, multi-step investigations on complex topics. When given a query, it autonomously performs dozens of searches, reads hundreds of sources, and reasons through the information iteratively to deliver comprehensive research reports in 2 to 4 minutes. The feature refines its research plan dynamically as it learns more about a subject, producing well-sourced, detailed analyses that would typically take a human researcher hours to compile. Deep Research runs on frontier models including Claude Opus 4.5 for Pro and Max users, achieving state-of-the-art performance on leading external research benchmarks. It excels in regulatory compliance research, technical investigations, policy tracking, and academic analysis. The tool is available through Perplexity Pro subscriptions with 20 daily research queries, while Enterprise Pro plans offer up to 500 daily research queries. An API is also available via Sonar Deep Research for developers building research-powered applications.