Thomson Reuters Launches CoCounsel Legal, an Advanced Agentic AI Platform

Thomson Reuters, a global content and technology company, today announced the launch of CoCounsel Legal, its most advanced AI offering to date. The new platform features Deep Research and guided workflows, designed to help legal professionals delegate tasks instead of just prompting a tool.

 

Thomson Reuters is uniquely positioned to deliver this breakthrough in agentic AI because it brings together three essential components: a sophisticated AI assistant with advanced reasoning models, comprehensive legal content and tools, and expertise from thousands of domain experts.

 

CoCounsel Legal: Built for Action, Not Just Ideas

CoCounsel Legal is a next-generation AI product that unifies legal research, workflow automation, intelligent document search, and AI-powered legal assistance in a single solution. It is the first time agentic AI has been deployed so broadly across legal workflows, with the infrastructure and scale to support enterprise-wide transformation.

 

Unlike AI copilots that assist with work, CoCounsel Legal is embedded in the work itself. It is built to drive real outcomes in litigation, transactional work, and regulatory analysis, and represents the future of how professional AI will be delivered to law firms and legal departments.

 

Deep Research on Westlaw: AI That Thinks Like a Lawyer

CoCounsel Legal includes Deep Research, a professional-grade agentic AI research capability grounded in Thomson Reuters content and tools. Deep Research is designed to reason, plan, and deliver comprehensive legal research results based on Westlaw and Practical Law content.

 

This feature allows legal professionals to hand off entire research questions to an AI that not only understands the assignment but also explains its process, cites its sources, and builds the argument foundations -- all 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, citation-backed reports from Westlaw and Practical Law.

   

"This is a meaningful 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 just returning search results. This level of transparency is essential for maintaining the oversight and trust lawyers need to confidently adopt AI in practice."

 

CoCounsel Legal also features a growing library of guided workflows, which are multi-step task flows that apply agentic AI to complex legal work. These workflows leverage expertise from Westlaw and Practical Law.

 

In addition to the workflows launched in July, new ones launching soon include:

• Drafting a privacy policy.

• Drafting an employee policy.

• Drafting a complaint.

• Drafting discovery requests and responses.

• Deposition transcript review.

 

These workflows are designed to embed legal content, apply structured reasoning, and provide human oversight, helping lawyers and 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 from simple prompting to sophisticated, multi-step task execution -- and that's a huge leap forward."

 

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