Last updated 08-11-2026
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CoCounsel (formerly Casetext)
CoCounsel is a legal research and drafting assistant now owned by Thomson Reuters after acquiring Casetext in 2023 for $650 million. It runs case law research, document review, contract analysis, and guided drafting grounded in Westlaw and Practical Law rather than the open web.
Standalone legal chatbots pull from generic training data. CoCounsel ties every answer to Thomson Reuters authority, which means citations trace back to Westlaw primary law and Practical Law guidance. The 2026 next-generation release adds Workspaces for matter-specific context, Brief Builder for agentic motion drafting, and a firm-intelligence layer for encoding internal expertise.
Litigation teams, transactional lawyers, and in-house counsel at firms already paying for Westlaw use it to cut research time and review contracts at scale. Pricing is sales-led with no public rate card, and the tool delivers the most value when bundled with an existing Westlaw subscription.
Deep Research workflows search Westlaw primary law and Practical Law guidance with traceable citations
Document review summarizes contracts, demand letters, and deposition transcripts from uploaded files
Brief Builder drafts complex motions and briefs with built-in citation checking and issue spotting
Workspaces maintain matter-specific documents, precedents, and context across sessions and colleagues
Microsoft 365 and document management system integrations keep drafting inside existing firm workflows
Firm intelligence layer lets lawyers encode internal expertise for reuse across matters
Citations trace to Westlaw and Practical Law authority, which reduces hallucination risk compared to generic legal chatbots.
Deep integration with Thomson Reuters content libraries gives firms that already pay for Westlaw a clear upgrade path.
2026 Workspaces and Brief Builder add matter-specific context and agentic motion drafting beyond basic Q&A.
No public pricing means every firm must go through a sales quote, often bundled with expensive Westlaw contracts.
Value drops significantly for firms without an existing Westlaw subscription to feed the research engine.
AI output still requires attorney verification of citations and legal conclusions before filing or client use.
What is CoCounsel?
CoCounsel is Thomson Reuters' legal AI assistant for research, drafting, and document analysis. It grounds answers in Westlaw case law and Practical Law guidance rather than generic web data, and it evolved from the Casetext product after Thomson Reuters acquired Casetext in 2023.
How much does CoCounsel cost?
CoCounsel does not publish a public price list. Plans are sold through Thomson Reuters sales teams, with reported costs ranging from about $225 to $639 per user per month depending on Westlaw bundling and firm size.
Does CoCounsel require Westlaw?
CoCounsel delivers the strongest results when integrated with Westlaw and Practical Law subscriptions. Standalone access is possible, but the assistant's citation-backed research depends on Thomson Reuters legal content libraries.
What happened to Casetext?
Thomson Reuters acquired Casetext in 2023 for $650 million and rebranded its AI product as CoCounsel. The casetext.com domain now redirects to the Thomson Reuters CoCounsel product page.
Can CoCounsel review contracts?
CoCounsel supports contract review, clause comparison, due diligence, and policy compliance checks. It can summarize agreements, flag non-standard terms, and assist with drafting revisions inside Microsoft Word.
What is CoCounsel Brief Builder?
Brief Builder is an agentic drafting tool in the next-generation CoCounsel release. It drafts complex briefs and motions with Westlaw authority, citation checking, and issue spotting built into the workflow.