CoCounsel (by Casetext)

CoCounsel, built by Casetext (now part of Thomson Reuters), is an AI legal assistant designed to perform substantive legal work that traditionally requires hours of attorney or paralegal time. The platform acts as an AI agent for legal professionals, capable of performing legal research, reviewing documents, analyzing contracts, preparing deposition outlines, and identifying legal issues. CoCounsel was one of the first AI legal tools built on GPT-4, and it has been specifically trained and fine-tuned for legal applications with a focus on accuracy and reliability. The platform's legal research capability allows attorneys to describe a legal question in plain language and receive a comprehensive research memo with relevant case citations, statutes, and analysis. CoCounsel's document review feature can analyze large document sets for relevance, privilege, and specific issues, dramatically reducing the time needed for discovery and due diligence. The contract analysis tool identifies key terms, obligations, deadlines, and potential risks across multiple contracts. CoCounsel includes a deposition preparation assistant that reviews case documents and generates suggested questions organized by topic. The platform emphasizes legal-grade accuracy with citation verification — it checks that cited cases actually exist and are still good law. CoCounsel integrates with Westlaw for comprehensive legal database access. The platform has been adopted by law firms of all sizes, corporate legal departments, and government agencies. Thomson Reuters' acquisition of Casetext has accelerated CoCounsel's integration into the broader legal technology ecosystem, making it accessible to the millions of legal professionals already using Thomson Reuters products.