The next generation of CoCounsel Legal

One million professionals across 107 countries and territories have chosen CoCounsel as their Fiduciary-Grade AI™ solution, marking a decisive shift in how high-stakes work gets done. AI has moved from experimentation to production, from testing to trust, from pilots to daily practice. With this milestone, CoCounsel Legal, an AI solution built specifically for legal professionals, has shown that AI can handle legal tasks with the rigor and accuracy the profession demands.

That raised a natural question: what if completing complex legal work required a single, simple query?

That is what CoCounsel Legal now delivers.

Rebuilt from the ground up, CoCounsel Legal is engineered to work at the level of a senior associate. It reasons through legal issues using the sources you already trust, and it keeps you in control of the work at every step.

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Removing the friction

Powering the next generation of legal work

Westlaw Brief Builder: A total transformation of research and drafting

Tabular Analysis: Review at scale

Built on trust

What this means for your practice

Looking ahead

What’s changed about CoCounsel Legal? Everything.

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Removing the friction

The classic version of CoCounsel Legal proved that AI could be trusted with complex legal work. But it still asked legal professionals to understand how to use AI well: to select the right skills, structure workflows, and write effective prompts.

CoCounsel Legal now offers a faster, more intuitive experience. Simply describe what you need in plain language, and CoCounsel Legal gets to work. It develops the right legal approach, works through each step, and delivers polished work product with citations. This isn’t just a better interface. It is a change in the way legal professionals use AI to work.

CoCounsel Legal has moved from skills orchestration to agentic technology that builds a plan and executes each step automatically. That means fewer steps for professionals and bigger outcomes for the organizations they serve, whether that is a law firm, a corporate legal department, or a government agency.

Powering the next generation of legal work

CoCounsel Legal is built on four foundational pillars that work together so legal professionals can accomplish more, faster, with less friction.

Deep, authoritative content at the core

CoCounsel Legal reasons using Westlaw, Practical Law, and your own documents, with no separate searches required. It retrieves what is relevant to your matter, applies it, and provides source citations. These are the same trusted sources legal professionals already rely on, now working as the foundation of every task and analysis. Dedicated Workspaces bring firm and legal department documents, precedents, and institutional knowledge into that same environment for every matter, so context carries across teams instead of starting from scratch each time.

Thousands of domain experts shaping the system

Attorney-editors and legal specialists continuously refine how CoCounsel Legal works, so outputs reflect real-world professional standards. This isn’t AI trained on generic internet data. It is AI shaped by the expertise legal professionals expect.

Professional tools, integrated

CoCounsel Legal works with the specialized tools legal teams use every day, including Microsoft 365, and connects to document management, practice management, and file storage systems. It works within your existing systems, not around them, so you can research, draft, analyze, and review documents without changing how you work.

Advanced agentic reasoning

With every query, CoCounsel Legal determines what needs to be done, chooses the best approach, builds a tailored plan, and works through each step. It adapts to complexity and completes multi-step work on its own, so you no longer need to break tasks into pieces or move between tools.

The result: any legal task, completed by describing it end-to-end in natural language in a single query. Even complex, multi-step work can be handled from a single request.

Westlaw Brief Builder: A total transformation of research and drafting

Litigators don’t need another tool that only drafts fast. They need drafts they can stand behind with confidence under deadline pressure. Westlaw Brief Builder, part of CoCounsel Legal, is built specifically for drafting briefs and motions, with verification built into the process. It is truly a transformation of research and drafting, bringing together everything litigators need to draft litigation briefs with confidence.

Grounded in Westlaw and Practical Law

Every draft is grounded in Westlaw authority, KeyCite, and Practical Law guidance, not general-purpose AI guesswork. Westlaw Brief Builder uses Westlaw Deep Research to find authorities based on the arguments you select, and the jurisdiction and venue you specify. Each authority appears with its citation, a description of the holding, and an explanation of how it supports your argument, so you can confirm relevance before including it. No other legal AI drafting tool draws on this content the same way.

A guided, step-by-step workflow

Westlaw Brief Builder walks litigators through a structured workflow rather than handing you a finished draft and wishing you luck. It moves through intake and document analysis, argument identification, supporting-authority research through Westlaw Deep Research, full draft creation, with citation verification built in. And, the lawyer stays in control at every step; making each decision along the way. You can add facts or authorities, or request additional research along the way, and Westlaw Brief Builder redevelops the argument around them. The result reflects your strategic choices at every stage.

Built-in verification

Citation checking, quote validation, and issue spotting are part of how Westlaw Brief Builder works, not steps you bolt on at the end. Westlaw Brief Builder verifies the law and the facts before providing any outputs. You can then review, verify, and modify before moving forward. All assertions are grounded and trace back to facts and authorities. No AI is free from error, so verifying citations and assertions remains your professional responsibility. Westlaw Brief Builder is designed to make that review faster and more thorough. Deep Research Verify strengthens this further, checking that cited Westlaw and Practical Law authority actually supports each legal assertion.

The lawyer stays in control

Westlaw Brief Builder is agentic with a human in the loop. It pauses at key decision points and waits for your input: you choose which arguments to pursue, the relevant documents to upload, who you represent, the proper jurisdiction, and which authorities and facts to include. This is different from dropping a complaint into a public chatbot and asking it to write a motion. You see the reasoning, you see which claims each argument targets, the particular facts identified to support the argument, and you decide what goes in. Westlaw Brief Builder supports lawyer judgment; it does not replace it.

Tabular Analysis: Review at scale

When you’re facing thousands of documents and a deadline that isn’t moving, every hour counts. With Tabular Analysis, you can build a table from any subset of your workspace files, up to 10,000 documents and 100 questions per table, and run as many tables as you need against those same files. You get back a table you can sort and filter, now with a redesigned interface that makes adding new columns smoother and a cleaner single-answer view when you want to focus on one response at a time.

Tabular Analysis is no longer an isolated silo. It lives in the same workspace as the rest of your matter, organized the way lawyers actually work, and it’s the foundation for the agentic and collaborative features coming next. Every answer still traces back to a clickable footnote, so you can validate the source quickly.

Tabular Analysis is powered by Thomson, Thomson Reuters’ own AI model built for legal work. That means the analysis is grounded in how lawyers actually reason through documents, rather than how a general-purpose model approximates it. Legal teams can put it to work on discovery review, due diligence, and any matter where the document count is high and the timeline is short.

Built on trust

In professional work, trust cannot be an afterthought. CoCounsel Legal delivers explainable, traceable outputs grounded in authoritative content. You can see the steps CoCounsel Legal took, what sources it consulted, and how it used them. The reasoning, analysis, and execution are transparent, reviewable, and verifiable.

Your data also stays your data. It remains secure and isolated, and is never used to train underlying models.

Enterprise governance and auditability are foundational to CoCounsel Legal. This is Fiduciary-Grade AI built for professions where accuracy, accountability, and trust are non-negotiable.

What this means for your practice

The premise is straightforward: the most advanced AI shouldn’t require the most advanced users. It should fit how professionals already work, making sophisticated, complex work faster and easier.

CoCounsel Legal delivers greater ROI by giving professionals more time for strategy and judgment, the distinctly human work that defines excellent legal counsel. When AI handles the planning and execution of complex work, attorneys in firms, legal departments, and government agencies can focus on the analysis, interpretation, and counsel that define their impact.

Looking ahead

The new CoCounsel Legal experience is available now in the US, with Canada, UK, and Australia coming later this year. For legal leaders, the question is no longer whether AI will change how work gets done. It is whether your organization will be ready when it does.

As lawyers use AI throughout more of their day, legal work still requires trust, verification, and judgment. The expanded CoCounsel Legal MCP with Claude meets that need, bringing Thomson Reuters’ authoritative legal content, domain expertise, and citation-grounded outputs into Claude’s flexible environment. Originally launched this May with Deep Research, it now brings an expanded range of capabilities. It is coming soon as a pilot for qualifying CoCounsel Legal customers, giving lawyers a way to work between the two without losing the standards their work demands.

Synergy is where legal professionals come together to explore the future of law, including CoCounsel Legal. Join peers and industry experts from around the country for expert-led sessions designed to transform your practice. Secure your spot for Synergy 2026 and register today.

The next generation of CoCounsel Legal

Go inside the making of the new CoCounsel Legal experience

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