Paid

CoCounsel

Name: CoCounsel
Price: 4500 USD
Author: Challenging Voice

Reached 1 million users in 3 years, backed by Thomson Reuters after a $650M acquisition

4.3 Legal AI

4.3 Very good 4.3

Bottom line: CoCounsel is a strong legal ai tool, best known for first AI legal assistant built on GPT-4, launched March 2023. Paid from $4,500/mo.

Thomson Reuters backing brings deep legal-content integration most competitors lack Practical Law integration requires the higher-priced tier to access fully

Reviewed by Challenging Voice Editorial · Updated Jul 2026 How we rate

PricingFrom $4,500/mo

Free planNo

CompanyThomson Reuters

PlatformsAPI, Web

Best forLegal AI

Founded2023

Visits1

Last reviewedJul 2026

UpdatedJul 2026

Ask AI about CoCounsel ChatGPT Claude Perplexity

Overview

CoCounsel launched March 1, 2023 as the first AI legal assistant built on GPT-4, developed by Casetext before Thomson Reuters acquired the company for $650 million in cash a mere four months after release, folding it into Thomson Reuters' existing legal research and Practical Law products rather than operating it as a standalone startup.

That backing gives CoCounsel a multi-model AI architecture, drawing on frontier models from Anthropic, OpenAI, and Google alongside Thomson Reuters' own proprietary legal-AI technology, and the platform reached 1 million users across 107 countries and territories by 2026, a scale few standalone legal-AI startups have matched.

CoCounsel Core starts at $4,500 a user annually, roughly $225 a user monthly, with a Practical Law-integrated tier moving to $6,600 a user annually for access to Practical Law's practice guides and templates. For a legal team that wants an AI assistant backed by Thomson Reuters' existing legal-content ecosystem, with access to Practical Law's guides built in, rather than a standalone AI-only platform, CoCounsel's publisher-backed integration addresses that directly.

Key features

First AI legal assistant built on GPT-4, launched March 2023
Backed by Thomson Reuters after a $650M acquisition of Casetext
Multi-model architecture spanning Anthropic, OpenAI, and Google models
1 million users across 107 countries and territories by 2026
Optional integration with Thomson Reuters' Practical Law guides and templates
Published, transparent per-user annual pricing

Screenshots & demo

Pricing

CoCounsel is a paid tool, with plans that start at $4,500/mo.

Pricing modelPaid
Starting priceFrom $4,500/mo
Free planNo

Visit CoCounsel

Pricing is provided as a guide. Check the official site for the latest plans.

Pros & cons

Pros

Thomson Reuters backing brings deep legal-content integration most competitors lack
Massive user scale, 1 million users, validates broad real-world adoption
Multi-model architecture avoids dependence on one AI provider
Transparent published pricing, unlike most enterprise legal-AI competitors

Cons

Practical Law integration requires the higher-priced tier to access fully
Backed by a legacy legal publisher rather than operating as an independent AI-first startup
Entry pricing at $4,500 a year per user still represents a real budget commitment

How it compares

Tool	Rating	Free	From	Best known for
CoCounsel (this tool)	4.3	No	$4,500/mo	First AI legal assistant built on GPT-4, launched March 2023
Ironclad	4.2	No	$30,000/mo	Full contract lifecycle management: drafting, negotiation, approval, signing, storage
Legora	4.3	No	$3,000/mo	AI workspace unifying public legal sources and a firm's own documents
Clio	4.3	No	$49/mo	Manage AI converts practice tasks into completed actions, not just suggestions

Our verdict

4.3 / 5 4.3

CoCounsel is a strong legal ai tool, best known for first AI legal assistant built on GPT-4, launched March 2023. Paid plans start at $4,500/mo.

What makes it different: CoCounsel stands out for first AI legal assistant built on GPT-4, launched March 2023.

How we score it

Overall 4.3

Value for money 3.5

Feature depth 4.9

Popularity 3.7

Best for ProfessionalsTeamsCreatorsCurious learners

Frequently asked questions

What is CoCounsel?

CoCounsel is a legal ai tool listed in the Challenging Voice directory. Reached 1 million users in 3 years, backed by Thomson Reuters after a $650M acquisition.

Is CoCounsel free?

CoCounsel does not offer a free plan; paid pricing starts at $4,500 per month.

How much does CoCounsel cost?

CoCounsel starts at $4,500 per month. See the pricing plans above for full details.

What are the best CoCounsel alternatives?

Popular alternatives to CoCounsel include Clio, Harvey, and Legora. Browse them all in the Legal AI category.

Is CoCounsel any good?

CoCounsel scores 4.3 out of 5 based on our editorial review.