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Thomson Reuters Launches Next Generation of Cocounsel Legal and Introduces Westlaw Brief Builder
Thomson Reuters announced the general availability of the next generation of CoCounsel Legal, a fully agentic AI experience designed to help legal professionals move from research and issue analysis to trusted work product within a single workflow. CoCounsel Legal is engineered to reason, plan, and execute at the level of a senior associate. The enhanced experience brings together legal research, drafting, legal intelligence, verification, and matter-centric workflows in one connected environment, helping law firms and legal departments move seamlessly from question to strategy to execution. CoCounsel Legal addresses that need by combining transparent reasoning, citation-backed results, and trusted legal content with agentic capabilities that can orchestrate complex, multi-step tasks. Built on Anthropic's Claude Agent SDK, CoCounsel Legal can plan, reason, and execute across complex legal workflows rather than respond to isolated prompts. Every output remains grounded in verified, traceable legal authority and adheres to Thomson Reuters Fiduciary-Grade AI principles, providing the transparency, accountability, and confidence professionals demand. Since introducing early access to customers, Thomson Reuters has worked closely with legal professionals to refine the experience and develop new capabilities that address the most critical moments in the legal workflow. Through the evolution of CoCounsel Legal, Thomson Reuters committed to building partnerships with customers, inviting them to join the beta and early access programs to gather feedback. As the product developed, Thomson Reuters introduced several new agentic capabilities designed to help legal professionals accelerate high-value work. The newest addition to CoCounsel Legal, Westlaw Brief Builder helps litigators move from research and issue analysis to first-draft brief creation while validating authority along the way. Powered by Westlaw Deep Research, KeyCite, and Practical Law, it proposes relevant facts, arguments, and supports authority while keeping lawyers firmly in control of strategy, legal theory, and final decisions. Workspaces provide a dedicated environment for every matter, combining firm and legal department documents, precedents, and institutional knowledge to inform analysis from the outset. Context is preserved across matters and teams, helping legal professionals build on prior work instead of starting from scratch. The Drafting Agent in CoCounsel for Word enables legal professionals to draft, edit, and review agreements using natural language instructions directly within Microsoft Word, leveraging Practical Law content alongside an organization's own documents and playbooks. Designed for high-volume document review, Tabular Analysis allows attorneys to review up to 10,000 documents and ask up to 100 questions, with results returned in a dynamic, filterable table. Powered by Thomson Reuters proprietary legal-focused large language model, it is optimized for complex legal analysis where domain-specific AI can outperform general-purpose models. Deep Research Verify checks whether cited Westlaw and Practical Law authority supports specific legal assertions, helping legal professionals strengthen confidence in AI-assisted work product. Thomson Reuters is continuing its work with Anthropic, including the launch of an expanded CoCounsel Legal MCP with Claude in August. The integration enables legal professionals to access CoCounsel Legal directly from Claude and receive cited, traceable work product grounded in Westlaw, Practical Law, and their organization's own knowledge. Thomson Reuters and AWS are also expanding their collaboration, with a forthcoming MCP connection designed to extend CoCounsel Legal's trusted, verifiable legal AI into Amazon Quick, AWS's AI companion built for work, as well as other AWS offerings. Beginning in October, an integration with Reveal will allow litigation teams to bring reviewed evidence directly from Reveal into CoCounsel Legal for research, analysis, and drafting, eliminating the need to manually export and re-upload documents. One million professionals across 107 countries and territories now rely on CoCounsel, reflecting the industry's shift from AI experimentation to AI embedded directly into professional workflows where trust, sourcing, and accountability matter most. The new CoCounsel Legal experience is available now in the United States. Availability in Canada, the United Kingdom, and Australia is expected later this year.