CoCounsel is an AI-powered legal assistant built on GPT-4, designed to perform complex legal tasks such as document review, legal research, and contract analysis. Originally developed by Casetext, it was acquired by Thomson Reuters in 2023 to serve as a core component of their legal AI strategy.
Brand Authority Index (BAI): 88/100
Archetype: Challenger
Category: Legal Technology
https://optimly.ai/brand/casetext-cocounsel-by-thomson-reuters
Last analyzed: April 10, 2026
Founded: 2013 (Casetext); 2023 (CoCounsel launch)
Headquarters: Eagan, Minnesota, USA (Thomson Reuters) / San Francisco, CA (Casetext)