By Thomson ReutersLearning Objectives
- Understand what CoCounsel and Westlaw Advantage offer and how they work together
- Evaluate the Deep Research agentic AI capability for legal research
- Assess Thomson Reuters' dominant position in legal AI
What Are CoCounsel and Westlaw Advantage?
CoCounsel is Thomson Reuters' AI legal assistant — originally built by Casetext (acquired for $650 million in August 2023) and now integrated across Thomson Reuters' entire product suite. With 1 million users across 107 countries (as of February 2026), CoCounsel is the most widely adopted AI tool in the legal profession.
Westlaw Advantage (launched August 2025) is the latest AI-powered version of Westlaw — the legal profession's definitive research platform. Its headline feature is Deep Research: agentic AI that creates multi-step research plans, executes iteratively, and delivers comprehensive reports with transparent reasoning and links to primary and secondary legal sources.
💡Key Concept
Agentic Deep Research for Law: Unlike simple AI search that returns a list of cases, Deep Research acts like a junior associate: it creates a research plan, identifies relevant statutes and case law, reads and analyzes them, identifies arguments for and against your position, verifies citations, and delivers a structured report — typically in about 10 minutes. This targets the gap between quick AI summaries and genuine legal analysis.
CoCounsel Capabilities
- Document analysis — review contracts, briefs, and filings with AI-powered extraction
- Legal research — integrated with Westlaw's authoritative case law and statutes
- Contract review — identify key terms, risks, and obligations
- Deposition preparation — analyze transcripts and identify key testimony
- Compliance monitoring — track regulatory changes and flag relevant updates
- 1 million users across legal, tax, compliance, accounting, and audit
Westlaw Advantage: Deep Research
- Creates multi-step research plans and executes them iteratively
- Produces comprehensive reports with arguments for and against
- Transparent reasoning with links to Westlaw primary/secondary sources
- Litigation Document Analyzer — analyzes opposing motions, suggests counterarguments with supporting authority
- Most comprehensive analyses complete in approximately 10 minutes
Pricing
Company Details
| Detail | Info |
|---|---|
| Company | Thomson Reuters (NYSE: TRI) |
| Revenue (2025) | $7.48 billion (+7% organic growth) |
| AI Investment | $200+ million annually in productized AI |
| Capital Capacity | ~$11 billion through 2028 for AI investment and acquisitions |
| CoCounsel Users | 1 million across 107 countries |
| Casetext Acquisition | $650 million (August 2023) |
| Website | legal.thomsonreuters.com |
Key Takeaways
- CoCounsel has 1 million users in 107 countries — the most widely adopted AI legal tool, integrated across Thomson Reuters' entire suite
- Westlaw Advantage's Deep Research is the legal industry's first professional-grade agentic AI research tool — creating research plans, executing iteratively, and delivering structured reports
- Backed by Thomson Reuters' $7.48 billion revenue and $200+ million annual AI investment; $11 billion capital capacity for continued expansion
- CoCounsel Core starts at $225/user/month; Westlaw Advantage pricing is enterprise-custom
