Thomson Reuters Launches CoCounsel Legal: Transforming Legal Work with Agentic AI and Deep Research
Rhea-AI Summary
Thomson Reuters (TSX/Nasdaq: TRI) has launched CoCounsel Legal, a groundbreaking AI-powered legal solution featuring Deep Research and agentic guided workflows. The platform integrates with Westlaw and represents Thomson Reuters' most advanced AI offering to date, designed to help legal professionals move beyond prompting to delegation.
CoCounsel Legal's Deep Research capability is the industry's first professional-grade agentic AI research tool that can generate research plans, explain its logic, and deliver structured reports backed by Westlaw and Practical Law citations. The platform also includes guided workflows for tasks like drafting policies, complaints, and discovery requests.
The solution is already trusted by over 20,000 law firms and corporate legal departments, including the majority of top US courts and Am Law 100 firms.
Positive
- First industry-wide deployment of agentic AI across professional legal workflows
- Integration with trusted Westlaw and Practical Law content enhances reliability
- Extensive market penetration with 20,000+ existing clients
- Comprehensive suite of guided workflows for complex legal tasks
Negative
- None.
News Market Reaction – TRI
On the day this news was published, TRI declined 1.96%, reflecting a mild negative market reaction. Argus tracked a trough of -4.6% from its starting point during tracking. Our momentum scanner triggered 78 alerts that day, indicating high trading interest and price volatility. This price movement removed approximately $1.69B from the company's valuation, bringing the market cap to $84.33B at that time.
Data tracked by StockTitan Argus on the day of publication.
CoCounsel Legal includes Deep Research, an industry-first AI solution grounded in Thomson Reuters expert legal content, starting with Westlaw
Thomson Reuters is uniquely positioned to deliver this agentic AI breakthrough because it already has access to an AI assistant with advanced reasoning models, comprehensive legal content and tools, and expertise from thousands of domain experts—the three essential components required for reliable, professional-grade agentic AI.
CoCounsel Legal: Built for Execution, Not Just Ideas
CoCounsel Legal is a next-generation AI product that brings together legal research, essential workflow automation, intelligent document search and AI-powered legal assistance within one unified solution. It's the first time agentic AI has been deployed this broadly across professional legal workflows—with the infrastructure and scale to support enterprise-wide transformation.
Unlike AI copilots that sit beside the work, CoCounsel Legal is embedded in it—built to drive real outcomes in litigation, transactional work, and regulatory analysis. It represents the foundation for how professional AI will be delivered across law firms and legal departments into the future.
Deep Research on Westlaw: AI That Thinks Like a Lawyer
CoCounsel Legal includes Deep Research, grounded in Thomson Reuters content and tools. Deep Research in CoCounsel is the legal industry's first professional-grade agentic AI research capability—built to reason, plan, and deliver comprehensive legal research results grounded in Westlaw and Practical Law content. It enables legal professionals to hand off full research questions to an AI that not only understands the assignment — it explains its process, sources its answers, and builds the argument foundations, with human oversight.
Deep Research on the new Westlaw Advantage is integrated into CoCounsel Legal and can:
- Generate multi-step research plans
- Trace its logic with transparent reasoning
- Deliver structured, Westlaw and Practical Law citation-backed reports
"Thomson Reuters latest integration of advanced AI models into its core platforms marks an encouraging step forward in legal technology," said Colleen Nihill, Chief AI & KM Officer at Morgan Lewis. "Deep Research stands out for its ability to reason through legal questions rather than simply return search results. When faced with a complex issue, it can generate a research plan, explain its logic, and deliver a structured report. This level of transparency is essential to maintaining the oversight and trust lawyers need to confidently adopt AI in practice."
Guided Workflows: Multi-Step AI That Actually Works
Also included in CoCounsel Legal is a growing library of guided workflows—multi-step task flows that apply agentic AI to high-friction legal work, leveraging Westlaw and Practical Law expertise. In addition to the CoCounsel guided workflows launched in July, there are new workflows launching soon:
- Draft a Privacy Policy
- Draft an Employee Policy
- Draft a complaint
- Draft discovery request
- Draft discovery response
- Deposition transcript review
These workflows embed legal content, apply structured reasoning, and provide human oversight by design, helping lawyers and corporate legal teams move faster while staying in control.
"This is where AI starts to feel less like a tool and more like a teammate," said David Wong, Chief Product Officer at Thomson Reuters. "Guided workflows transform how professionals approach complex legal work, moving beyond simple prompting to sophisticated, multi-step task execution—and that's a huge leap forward in what legal AI can deliver."
Trusted by the Legal Market
Over 20,000 law firms and corporate legal departments and the majority of the top US courts and Am Law 100 firms already trust CoCounsel. With CoCounsel Legal, the company is setting a new benchmark for trusted, explainable, and production-ready AI in legal practice.
Additional Information
- For more details about Deep Research in CoCounsel
- For updates from our President, Legal Professionals
- For updates from our President, Corporates
- For more on Knowledge Search in CoCounsel
Thomson Reuters
Thomson Reuters (TSX/Nasdaq: TRI) informs the way forward by bringing together the trusted content and technology that people and organizations need to make the right decisions. The company serves professionals across legal, tax, accounting, compliance, government, and media. Its products combine highly specialized software and insights to empower professionals with the data, intelligence, and solutions needed to make informed decisions, and to help institutions in their pursuit of justice, truth, and transparency. Reuters, part of Thomson Reuters, is a world-leading provider of trusted journalism and news. For more information, visit tr.com.
Contact:
Ali Hughes
+1.763.326.4421
ali.hughes@thomsonreuters.com
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SOURCE Thomson Reuters
FAQ
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