What is CoCounsel?

CoCounsel is Thomson Reuters' AI assistant for legal professionals (originally Casetext's CoCounsel, acquired in 2023), covering research, drafting and document analysis. The vendor says CoCounsel Legal is grounded in Westlaw and Practical Law content and works on the web and inside Microsoft Word, Outlook and Teams.

Who it's for

The vendor lists law firms from solo practitioners to global firms, in-house legal departments including nonprofits, and government agencies, courts and educational institutions. It is a professional tool, and the vendor says it supports rather than replaces professional judgment.

Pros & cons

Strengths

Thomson Reuters says CoCounsel Legal turns a plain-language request into a step-by-step plan you can inspect, and returns cited work product with linked citations for verification.
The vendor lists Deep Research (multi-step research with a visible reasoning trail), guided workflows, Workspaces for matter documents, Westlaw Brief Builder and Tabular Analysis (up to 10,000 documents against 100 questions).
Content sources named by the vendor are Westlaw, Practical Law and the customer's own documents; a January 2026 press release says CoCounsel Legal launched in the UK with Westlaw Advantage covering UK legal content.
Integrations listed by the vendor include iManage, NetDocuments, SharePoint, HighQ, Box, DeepJudge, Smokeball, Litify, Microsoft Word, Outlook and Teams, and Claude through a CoCounsel Legal MCP.
The vendor says user content and prompts are not used to train or improve CoCounsel, its underlying LLMs or third-party models, that OpenAI and Google are contractually barred from training on customer data, and that it uses zero-retention API calls.
The vendor states data is encrypted with TLS 1.2 in transit and AES-256 at rest, that CoCounsel Legal is SOC 2 and ISO 42001 certified, and that region-based hosting is available in the UK, Australia and Canada.

Limitations

No prices are published. The plan pages show pricing only after you enter your sector, number of attorneys, jurisdiction and plan length, and online pricing is for new customers only.
Plans are sold as 1-, 2- or 3-year terms, and the vendor says longer terms typically cost less. Its plan pages do not state cancellation or refund terms.
Tiers are bundles: the 700 tier includes Westlaw Advantage, Practical Law Dynamic Tool Set and CoCounsel Essentials, while Essentials alone is a Word-based skills product. Online plan pages mention firms of 1-10 attorneys, and larger firms are sent to a sales rep.
Stored data and processing are in the U.S. by default, and retention periods are set per organization with a Thomson Reuters client manager. Tabular Analysis is currently U.S.-only per the UK press release, with localized versions to follow; the 300 tier page gives no description of its contents.
The pages read do not address attorney-client privilege specifically. Outputs should be checked by a qualified lawyer, and the vendor itself describes the product as supporting professional judgment.

Plans and pricing

CoCounsel Legal (700 tier): Contact sales / quote on request. Bundles Westlaw Advantage, Practical Law Dynamic Tool Set and CoCounsel Essentials. Online quotes for firms of 1-3 or 4-10 attorneys; larger firms go to sales. Free trial can be requested.
Practical Law Dynamic Tool Set with CoCounsel Essentials (500 tier): Contact sales / quote on request. AI workflows on Practical Law content plus AI-assisted document review and drafting. Aimed at firms of 1-10 attorneys, especially transactional and advisory work.
Westlaw Advantage with CoCounsel Essentials (300 tier): Contact sales / quote on request. Listed on the plan page in the government section; the page does not describe its contents. Confirm on the live pricing page.
CoCounsel Essentials: Contact sales / quote on request. Document analysis and drafting in Microsoft Word: tabular analysis, clause drafting and modification, contract playbooks, knowledge search and deposition preparation. Free trial can be requested.
Enterprise / custom: Custom. The vendor offers a sales contact for custom plans for larger firms, corporate legal departments and government.

No price is published on the Thomson Reuters plan pages I read; quotes depend on sector, attorney count, jurisdiction and 1-, 2- or 3-year term, and existing customers must contact sales. Currency and billing basis are not stated. Confirm on the live pricing page or with sales.

Details checked October 2026 against the vendor's own pages. Prices and limits change, so confirm before you buy. Official pricing page ↗

Sources

This profile was compiled from these public pages. We have not run hands-on tests.

Summary

CoCounsel — at a glance

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CoCounsel

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