Casetext CoCounsel

Casetext CoCounsel was one of the first major AI legal research products to demonstrate that large language models could perform substantive legal work at a professional level. In 2023, Thomson Reuters acquired Casetext for $650 million, integrating CoCounsel's capabilities into the Westlaw ecosystem.

What CoCounsel Does Well

Legal research automation is CoCounsel's flagship capability. Attorneys can ask research questions in natural language — "Find cases supporting the argument that non-compete agreements are unenforceable in California absent consideration" — and receive a cited answer with relevant cases, statutes, and secondary sources. The research is grounded in Casetext's legal database, reducing (though not eliminating) hallucination risk.

Contract review analyzes agreements to identify key provisions, flag unusual terms, summarize obligations, and highlight missing clauses. Attorneys upload a contract and receive a structured review in minutes rather than hours.

Deposition preparation generates deposition outlines from case documents. Given a complaint, expert report, or prior testimony, CoCounsel suggests lines of questioning, identifies inconsistencies, and organizes preparation materials.

Drafting assistance helps with motions, briefs, and client letters. Attorneys provide a framework and CoCounsel drafts language, which attorneys then edit and verify.

Thomson Reuters Integration

Post-acquisition, CoCounsel is being integrated with Westlaw Precision, adding access to Thomson Reuters' comprehensive legal database — case law, statutes, regulations, and secondary sources. This integration addresses the grounding problem that affected early legal AI tools.

Who CoCounsel Is For

CoCounsel serves law firms and in-house legal departments. The standalone product targets small and mid-size firms; the Westlaw-integrated version targets large firms and legal departments already in the Thomson Reuters ecosystem. Pricing varies by access level and firm size.