CoCounsel

CoCounsel is the agentic AI assistant built by Thomson Reuters for lawyers and in-house legal teams, layering generative reasoning over Westlaw, Practical Law, and an organisation's own documents. It closes the gap between general-purpose chatbots and real legal work by grounding every answer in citable authority and showing its reasoning step by step.

Key features of CoCounsel include:

• Deep Research: Runs multi-step legal research across Westlaw and Practical Law and returns a reasoned memo with linked citations, while Deep Research Verify confirms cited authority supports each claim.
• Westlaw Brief Builder: Moves litigators from issue analysis to a structured first-draft brief inside a single workflow, validating supporting authority as the argument is assembled.
• Tabular Analysis: Reviews up to 10,000 documents against as many as 100 questions at once and returns the answers in a filterable table for due diligence and discovery.
• Drafting Agent: Drafts, edits, and reviews agreements through natural language commands directly inside Microsoft Word, drawing on Practical Law standard clauses and precedent.
• Workspaces And Integrations: Gives each matter a dedicated environment for documents and history, and connects to iManage, NetDocuments, SharePoint, Box, HighQ, and Anthropic's Claude.

Best for: Law firms and corporate legal departments of any size that want AI research, drafting, and document review grounded in licensed Westlaw and Practical Law content.

CoCounsel shortens the path from question to citable work product, letting legal teams absorb more matters without adding headcount while preserving the verifiable authority that legal work demands.