CoCounsel
Grounded legal research and document review for law teams
CoCounsel is a legal AI assistant from Thomson Reuters that grounds research and document review in trusted legal content. It aims to give attorneys answers they can cite, backed by sources such as Westlaw and Practical Law, instead of the unsourced text a general chatbot produces.
For legal teams weighing AI tools, the core question is trust. CoCounsel answers it by tying its output to a known content library and a publisher with a long history in the legal market. This review covers what the assistant does, how it performs, what it costs, and where it fits against alternatives.
What is CoCounsel?
CoCounsel is a legal AI assistant built by Thomson Reuters. It helps attorneys and legal professionals run research, review documents, and prepare for depositions, with answers grounded in trusted legal content rather than open web sources.
Thomson Reuters is a long-standing legal publisher and the company behind Westlaw and Practical Law. CoCounsel draws on that content library, so the assistant can point to sources a firm recognizes and can cite. This grounding is the product's main promise: it reduces the fabricated citations that make general chatbots risky for legal work.
The tool serves law firms of many sizes, corporate legal departments, and solo practitioners who need dependable research. It suits users who care more about source-backed accuracy than open-ended conversation, and who want one assistant that covers research, review, and preparation tasks.
Key features
CoCounsel focuses on the tasks that fill a legal professional's day. Its features center on grounded research and document handling.
- Source-grounded research: The assistant answers legal questions using trusted content and returns citations you can check.
- Document review: Upload large sets of documents and get summaries, extractions, and flagged issues at scale.
- Deposition preparation: Draft questions and outlines based on case materials and prior testimony.
- Contract analysis: Review clauses, spot risks, and compare terms across agreements.
- Citation-backed answers: Each response links to the underlying source so an attorney can verify before relying on it.
- Ecosystem integration: The assistant connects to Westlaw and Practical Law content many firms already license.
The grounding is what sets these features apart. A general chatbot can summarize a contract, but it cannot tie a research answer to a citation an attorney trusts. CoCounsel builds that link into each skill, which keeps the human review step short and focused.
How well does it work?
CoCounsel performs well on the tasks it was built for, with the strongest results in grounded research and bulk document review.
Strengths
The source grounding is the clearest strength. Because answers link to trusted content, attorneys spend less time checking whether a citation exists and more time judging whether it applies. Document review scales to large sets that would take a paralegal days to read, and the assistant surfaces the passages that matter. Deposition preparation turns case files into a usable outline in a fraction of the manual time.
Limits
The assistant is a drafting and research aid, not a substitute for judgment. Its output needs attorney review before it reaches a client or a court, and it works best when a lawyer frames the question with care. Coverage is strongest where Thomson Reuters content is deep, so results can thin out in niche practice areas or jurisdictions with lighter source material.
CoCounsel pricing
CoCounsel uses custom pricing. Thomson Reuters quotes based on firm size, the skills you need, and how the assistant fits your existing subscriptions, so there is no public per-seat rate.
The tiers below reflect how the product is packaged across market segments. Exact figures come from a sales conversation.
Value tends to rise for teams that hold other Thomson Reuters subscriptions, since CoCounsel draws on that content. Firms without Westlaw or Practical Law should weigh the combined cost, because the grounding leans on those libraries.
Who should use CoCounsel?
CoCounsel fits legal teams that value source-backed accuracy and want to cut manual hours on research and review. It is a match for these groups:
- Law firms that run frequent legal research and need citations they can trust.
- Litigation teams preparing depositions and reviewing large document sets.
- Corporate legal departments handling contract review at volume.
- Solo and small-firm attorneys who want a research aid grounded in trusted content.
- Firms that hold Westlaw or Practical Law subscriptions and want more from that content.
It is a weaker fit for teams that want a low-cost, self-serve chatbot or for practices in narrow areas where the underlying content library is thin. Those users may find the custom pricing and ecosystem dependency hard to justify.
Alternatives and how it compares
CoCounsel competes with a growing set of legal AI tools. The main alternatives differ in how they source their answers.
- Harvey: A legal AI assistant aimed at large firms and enterprise legal teams, with a focus on drafting and research across a firm's own materials.
- Lexis+ AI: The AI assistant from LexisNexis, grounded in the Lexis content library, which makes it the closest publisher-backed rival to CoCounsel.
- Spellbook: A contract drafting and review tool that works inside Microsoft Word, aimed at transactional lawyers.
CoCounsel's edge is its tie to Thomson Reuters content and the breadth of skills in one assistant. Lexis+ AI offers a similar grounding model from a rival publisher, so the choice can come down to which content library a firm already trusts. Harvey and Spellbook appeal to teams that want firm-specific drafting or in-document workflows over publisher-grounded research.
Limitations and getting started
Before adopting CoCounsel, weigh a few honest drawbacks. The pricing is custom and opaque, which makes it hard to compare against subscription tools with published rates. Much of the value depends on holding other Thomson Reuters subscriptions, so the sticker price is not the whole cost. And every output needs attorney review, so the tool speeds work without removing the human step.
Getting started
- Contact Thomson Reuters through the product page for a demo and a quote scoped to your firm.
- Confirm how CoCounsel connects to any Westlaw or Practical Law subscriptions you hold.
- Run a pilot on a defined task, such as document review for one matter, to measure time saved.
- Set an internal review policy so attorneys check citations before output leaves the firm.
- Roll out to more seats once the pilot shows dependable results.
A scoped pilot is the safest path. It lets a firm test the grounding on its own matters and confirm the value before a wider commitment.
Pros & cons
What we like
- Grounds answers in trusted Thomson Reuters legal content, which reduces the risk of fabricated citations.
- Handles document review, deposition preparation, and research within one assistant.
- Connects to Westlaw and Practical Law resources many firms use.
- Built by a legal publisher with deep domain knowledge, not a general chatbot vendor.
What could be better
- Pricing is custom and opaque, which makes budgeting hard for smaller practices.
- Value depends on holding other Thomson Reuters subscriptions such as Westlaw.
- Output still needs attorney review before it reaches a client or court.
The verdict
CoCounsel is a strong fit for firms that want AI research grounded in trusted legal sources rather than open web guesses. The custom pricing and reliance on the wider Thomson Reuters ecosystem make it a better match for established practices than solo experimenters.