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.