Cocounsel Legal
Part of the Thomson Reuters platform.
What it is
What It Does
CoCounsel Legal is an AI legal assistant from Thomson Reuters. It combines generative and agentic AI to handle legal tasks including document search and review, summarising documents and depositions, building case timelines, preparing deposition questions, drafting pleadings and correspondence, and contract analysis.
Who It’s For
The tool spans research, analysis, drafting and review stages across most practice areas. It is aimed at law firms and in-house teams of varying sizes, and Thomson Reuters has extended the CoCounsel brand beyond legal into tax, accounting, audit, risk and compliance.
What We Found
CoCounsel was originally launched by Casetext on 1 March 2023, built on early access to GPT-4, and billed as the first AI legal assistant. Thomson Reuters acquired Casetext and CoCounsel about four months later for $650 million. Thomson Reuters reports CoCounsel reaching 1 million users across 107 countries (per LawSites, February 2026) and has since shipped CoCounsel 2.0, which it states is roughly three times faster than the prior version.
What We Haven’t Verified
- The 1-million-user figure is Thomson Reuters’ own metric, reported via LawSites and passed through here.
- Pricing — not publicly published; sold through Thomson Reuters’ enterprise channels.