AI is moving beyond instant answers to deep, autonomous reasoning—and OpenAI’s Deep Research is leading the charge. This new ChatGPT feature analyzes multiple sources, processes PDFs, and compiles citation-backed reports in minutes, setting a new benchmark for AI-driven knowledge synthesis. Deep Research scored 26.6% on Humanity’s Last Exam, crushing GPT-4o (3.3%) and Gemini Thinking (6.2%), proving that longer reasoning cycles are the next frontier.