CoCounsel

CoCounsel is generally sold as an add-on or bundle alongside Westlaw, and pricing sits at the higher end of the legal AI market — often in the low-to-mid hundreds of dollars per month per user, with full bundles reaching several hundred dollars. Notably, case law access is not always included in entry tiers, which can raise the real cost. Confirm current plans and what each tier includes on the official Thomson Reuters site.

The assistant supports legal research, discovery-scale document review, contract analysis and modification, and drafting or proofreading tasks. Its Deep Research capability generates research plans and returns source-linked answers, while other workflows help lawyers review documents and refine contract language. It is designed to assist across a matter rather than handle a single narrow task.

Yes — CoCounsel is built to operate within the Thomson Reuters ecosystem and integrates with authoritative content from products like Westlaw and Practical Law. It is often packaged together with these tools, and the assistant is designed to follow users across connected workflows. This tight integration is a key reason it appeals to firms already using Westlaw.

CoCounsel is designed for legal work and built to maintain the confidentiality and security standards the profession requires, backed by Thomson Reuters' enterprise infrastructure. Firms with strict compliance obligations should review the current security documentation and data-handling terms directly with Thomson Reuters before onboarding.

The value proposition is strongest for firms already paying for Westlaw, since CoCounsel adds an AI layer on top of content they already use. Firms without an existing Westlaw commitment face a larger combined cost and may find standalone legal AI tools more economical for comparable research capabilities. Weigh the full bundle price against your actual usage.

CoCounsel was originally developed by Casetext and became part of Thomson Reuters' legal AI offering, where it now sits at the center of the company's AI research, drafting, and document review strategy alongside Westlaw Precision. That heritage explains its strong focus on grounded, source-linked legal research.

No, CoCounsel does not offer a free plan or free trial. It's available through 1-year, 2-year, and 3-year subscription plans, with CoCounsel Core starting at $225/month. Multi-year plans offer discounted pricing compared to annual subscriptions.

CoCounsel integrates within the Thomson Reuters legal ecosystem and follows users throughout their workflow. It works with Microsoft Word for drafting and redlining tasks. Specific third-party integrations beyond the Thomson Reuters product suite were not detailed in available research.

CoCounsel is distinguished by its Thomson Reuters legal content backing and security standards, making it a preferred choice for firms with strict confidentiality requirements. Alternatives like Harvey, Spellbook, and Clio Manage offer different approaches—some with multi-model systems or different pricing structures. Users report CoCounsel performs better than generic ChatGPT for legal work but note it can return irrelevant cases and struggles with very large documents.