Thomson Reuters released CoCounsel Legal, an AI-powered legal research and drafting tool built on Westlaw.
It automates research-to-draft workflows while keeping lawyers in control.
The product includes document review for up to 10,000 files and handles 100 questions per workspace.
What happened
Thomson Reuters made CoCounsel Legal generally available, a next-generation legal AI product that integrates research, drafting, verification, and case workflows built on Westlaw and Practical Law. The Westlaw Brief Builder moves from research and issue analysis to first-draft generation while checking supporting authority, and the product now includes workspaces, Word drafting, and tabular review for up to 10,000 documents and 100 questions.
Why it matters
The product positions AI as a research and drafting assistant within a single workflow while keeping lawyers in control of strategy and final decision-making. By combining Westlaw's legal research foundation with agentic AI capabilities, it aims to compress manual research-to-draft work into a structured, verifiable process.
What to watch
Adoption among legal professionals will indicate whether firms trust AI-assisted drafting when backed by authoritative legal databases. The 10,000-document and 100-question capacity suggests the system is designed for substantial matter workflows, making uptake among mid-to-large practices a key indicator.
Ask the AI about this article →
Thomson Reuters has positioned CoCounsel Legal as a full-cycle legal workflow product rather than a standalone research or drafting tool. By anchoring the agentic system to Westlaw—its own authoritative legal research platform—and Practical Law, the company ensures that AI-generated drafts are grounded in verified legal authority, a critical requirement for lawyer adoption. The emphasis that "the lawyer still controls the strategy and the final decision" directly addresses a core concern in the legal sector: that AI should augment human judgment rather than replace it.
The specific capacity limits (10,000 documents, 100 questions per workspace) signal that the product is engineered for substantive legal work—not toy examples—making it a credible offering for practices handling document-heavy litigation, due diligence, and research-intensive matters. The integration of Word drafting and tabular review alongside agentic reasoning suggests Thomson Reuters is betting that lawyers will trust AI outputs more readily when they can inspect them within familiar tools and workflows.
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