A junior associate at a mid-size law firm was asked to find every federal case involving non-compete enforcement for software engineers in the past five years. Using traditional legal research tools, this would take 6-8 hours of careful searching, reading, and cross-referencing. Using an AI legal research assistant, she had a comprehensive, citation-verified list with case summaries in 15 minutes. The AI did not just search keywords. It understood the legal concepts, identified relevant cases even when they used different terminology, and organized results by relevance to her specific question. Casetext's CoCounsel (now part of Thomson Reuters) uses GPT-4 to answer complex legal research questions, review documents, and draft memos. The transformation is comparable to the shift from physical law libraries to Westlaw, but compressed into months instead of decades.