CoCounsel is Thomson Reuters' AI legal assistant, integrated into the Westlaw and Practical Law environments and powered by GPT-4. It handles document review, contract analysis, deposition preparation, legal research, and memo drafting within the same platform that legal professionals already use for case research. The key differentiator from generic AI tools is sourcing: CoCounsel cites verified legal authorities from the Westlaw database, including case law, statutes, and secondary sources, which substantially reduces the hallucination risk that makes other AI tools problematic in legal practice. Attorneys can verify every cited case directly within Westlaw. Law firms, corporate legal departments, and legal aid organizations use CoCounsel to accelerate high-volume document review, first drafts of routine documents, and research on unfamiliar areas of law where junior attorney time is expensive.

What the community says

CoCounsel has been positively received in law firm circles, particularly for large firms that were already Westlaw subscribers and see it as an incremental capability rather than a new vendor relationship. Associates report that document review tasks that used to take hours are completed in minutes. Some smaller firms find the pricing prohibitive relative to generic AI tools like Claude or GPT-4. Legal AI observers note that the Westlaw integration is its clearest advantage over competitors.

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