CoCounsel Legal

✓ Verified

★★★★★

(4.7) $551.85/month per attorney Paid

Web

Agentic AI legal assistant from Thomson Reuters that researches, drafts, and reviews documents grounded in Westlaw and Practical Law content.

Best For: Firms that want AI research and drafting grounded in Westlaw authority

Visit Website

The Verdict: CoCounsel Legal

CoCounsel Legal is the strongest pick in this category when your firm already runs on Westlaw and you want AI that cites its sources. The agentic workflow, the tabular review at real diligence scale, and the citation discipline make it feel like a supervised associate rather than a toy. The honest trade-offs are price and gravity. It is premium priced per attorney, the plan menu shifts by jurisdiction, and firms outside the Thomson Reuters world will not get the same value. If your practice is built on Westlaw, this is the AI layer to beat. If it is not, the switching cost belongs in your decision from day one.

What is CoCounsel Legal?

CoCounsel Legal is Thomson Reuters' agentic AI assistant, built to handle the working core of legal practice rather than just answer questions. You describe a matter in plain language and it builds a step-by-step plan, then carries out legal research, drafting, document review, and analysis with reasoning you can follow from start to finish. The grounding is what separates it from general chatbots. Every output draws on Westlaw case law and statutes, Practical Law know-how, and your own firm documents, so a memo or brief starts from real authority instead of model memory.

The standout pieces are built for scale and verification. Deep Research produces full reports with linked citations, Tabular Analysis runs the same set of questions across thousands of documents for due diligence and eDiscovery style review, and the Westlaw Brief Builder moves from issue framing to argument structure while validating citations against KeyCite. Workspaces keep the documents, templates, and history of a matter together, so the assistant reasons with the full context of the case each time you return to it.

This is a platform for firms and legal departments that already treat Westlaw as their source of truth and want AI labor layered on top of it. Litigation teams use it for briefs and research, transactional teams for contract review and obligation extraction, and knowledge teams for turning prior work product into reusable starting points.

Who is CoCounsel Legal Best For?

Firms that want AI research and drafting grounded in Westlaw authority

CoCounsel Legal Key Features

Agentic workflows that plan and carry out multi-step legal tasks from a single prompt

Legal research grounded in Westlaw case law, statutes, and secondary sources

Practical Law guidance woven into research answers and draft documents

Deep Research reports with linked citations supporting every claim

Tabular Analysis that reviews up to 10,000 documents against up to 100 questions

Westlaw Brief Builder for issue framing, argument structure, and citation validation

Workspaces that hold matter documents, templates, and conversation history in one place

Document review and redlining inside Microsoft Word

Key date and obligation extraction from contracts and case files

Transparent step-by-step reasoning you can inspect before relying on the output

CoCounsel Legal Review Summary

Performance Score	A
Content Quality	Research output reads like a strong junior associate draft, with citations tied to real authority.
Interface	The workspace layout keeps matters, documents, and conversations organized without a steep learning curve.
AI Technology	Agentic reasoning over Westlaw, Practical Law, and your own documents, with transparent steps you can audit.
Purpose	To cut research, drafting, and document review time for firms that practice on Thomson Reuters content.
Compatibility	Web, Microsoft Word, Microsoft 365
Pricing Summary	Starts at $551.85 per attorney per month on small-firm plans, with larger firms quoted by sales.

CoCounsel Legal Pros & Cons

✅ Pros

Answers cite real Westlaw authority, so a lawyer can verify each claim in minutes
One assistant covers research, drafting, review, and analysis instead of separate tools for each job
Tabular review handles diligence-scale document sets that plain chat tools cannot
Built by the team behind Westlaw, so the depth of legal content is hard to match
Reasoning steps stay visible, which makes supervising the AI practical for partners

❌ Cons

Premium per-attorney pricing puts it out of reach for many solo and small practices
Best value shows up only if your firm already does its research on Westlaw
Coverage and plan options vary by jurisdiction, which complicates the buying decision
No self-serve trial, so evaluation runs through sales calls and demos

FAQs

What is CoCounsel Legal?

▼

It is the agentic AI assistant from Thomson Reuters for law firms and legal departments. It plans and carries out research, drafting, document review, and analysis tasks using Westlaw and Practical Law content.

How much does CoCounsel Legal cost?

▼

It is premium priced per attorney, and the exact figure depends on your plan, jurisdiction coverage, and contract term. Check the pricing summary on this page for the current starting figure.

Does CoCounsel Legal replace Westlaw?

▼

No. It works on top of Westlaw and Practical Law content, so most firms keep their existing research subscriptions and add CoCounsel as the working layer above them.

Can lawyers verify the citations CoCounsel produces?

▼

Yes. Research answers and Deep Research reports link claims back to sources, and the Brief Builder validates citations against Westlaw so you can check each authority before filing.

Is client data used to train CoCounsel Legal?

▼

No. Thomson Reuters states that customer data is not used to train its models, and the product runs under enterprise security controls built around law firm confidentiality duties.

Who is CoCounsel Legal best for?

▼

Litigation and transactional teams that already rely on Westlaw and want cited drafting, large-scale document review, and research inside one assistant rather than a general chatbot.