Thomson Reuters' agentic legal AI grounded in Westlaw and Practical Law — handles legal research, document review, contract analysis, drafting in Word, and depositions prep with verified citations.
Thomson Reuters' agentic legal AI grounded in Westlaw and Practical Law — handles legal research, document review, contract analysis, drafting in Word, and depositions prep with verified citations.
CoCounsel is the legal AI built originally by Casetext, acquired by Thomson Reuters in 2023, and now positioned as the flagship product of Thomson Reuters' AI strategy — woven into Westlaw, Practical Law, HighQ, and Legal Tracker. The defining technical claim, repeated across the Thomson Reuters site and customer stories, is grounding: every response is anchored to Westlaw's authoritative legal database (150 years of editorial expertise), Practical Law's templates and guides curated by 650+ attorney-editors, and the customer's own uploaded documents — with citation verification built in. Functionally, CoCounsel handles document review and analysis (privilege, key terms, deviations), contract review with risk assessment, grounded legal research with Westlaw citations, deposition preparation, drafting inside Microsoft Word, agentic multi-step workflow orchestration, and bulk document processing. Customer stories on the public site put the value in measurable terms: Justly Prudent achieving 5x ROI and 100% increase in litigation capacity, Brinks streamlining legal work and cutting outside counsel spend, Harris Hardy & Johnstone reducing hour-long reviews to minutes, and the Pascua Yaqui Tribe transforming matter management with HighQ. Pricing is enterprise-only, sold by seat with annual contracts — typical legal AI economics — and falls squarely into Thomson Reuters' procurement motion.
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The leading AI legal assistant for document-heavy practices, backed by Thomson Reuters' unmatched legal content. Expensive but delivers real time savings on document review, contract analysis, and deposition prep. Not a replacement for legal judgment — a force multiplier for it.
Generates research answers and memos backed by Westlaw case law, statutes, regulations, and secondary sources, with inline citations linked to the original authorities for one-click verification.
Ingests very large evidence and discovery sets, applies a consistent legal question or review criteria across every document, and returns structured tables of findings with source citations.
Reviews contracts against firm playbooks or policy standards, flags missing or deviating clauses, and produces redline-ready commentary aligned to defined review checklists.
Extracts key facts, prior inconsistent statements, exhibits, and timelines from transcripts and case files to produce deposition outlines and witness preparation materials.
Embeds AI drafting directly into Word so attorneys can generate first drafts of motions, briefs, contracts, and correspondence using matter context and firm precedent without leaving their document.
Chains multiple skills into multi-step workflows across Westlaw, Practical Law, Document Intelligence, and HighQ, allowing CoCounsel to plan and execute compound matter tasks rather than single prompts.
SOC 2 Type II compliant, with no training on customer data, role-based access controls, matter-level data isolation, audit logging, and SSO support suited to regulated legal environments.
Custom contracts
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Thomson Reuters has continued to expand CoCounsel from a skills-based assistant into an agentic legal platform. Recent and ongoing updates include deeper agentic workflows that chain multiple skills into multi-step matter execution, broader Microsoft 365 integration (CoCounsel Drafting in Word and Outlook surfaces), expanded HighQ and Document Intelligence integration for matter-centric AI, and the rollout of CoCounsel Core for tax, audit, and risk professionals. Thomson Reuters has also publicly committed to a multi-model strategy — incorporating frontier models from multiple AI providers behind the CoCounsel interface — while keeping all retrieval grounded in its proprietary Westlaw and Practical Law content. Enterprise governance features (audit logs, admin controls, regional data residency options) have continued to mature to meet large-firm and government procurement requirements.
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