Thomson Reuters' legal AI product for research, document analysis, and drafting with cited material. Legal professionals still need to verify authorities, facts
Last reviewed: 2026-10-03
CoCounsel Legal supports research, analysis, and drafting using legal content and matter context. Thomson Reuters traces CoCounsel's origins to Casetext. That history does not make every former Casetext service interchangeable with today's CoCounsel Legal product.
For an evaluation, use a matter with an attorney-approved answer and a defined jurisdiction. Inspect each cited authority, its relevance, and the facts used in a draft. Include conflicting documents and missing information, and measure the review required before the output can enter a professional workflow.
No. CoCounsel originated at Casetext, but this guide identifies the current Thomson Reuters legal product specifically.
No. A legal professional needs to check the facts, cited authorities, jurisdiction, and reasoning before relying on the work product.