最后更新 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.
深度研究工作流整合Westlaw一手法律与Practical Law指导，引用可追溯
文档审查总结合同、律师函与取证记录（上传文件）
法律文书起草工具内置引用检查与争议点识别，支持复杂动议与诉状
工作空间保存案件专属文档、先例与上下文，支持跨会话与同事协作
与Microsoft 365及文档管理系统集成，保持现有律所工作流
律所智能层允许律师编码内部专业知识供跨案件复用
引用可追溯至Westlaw与Practical Law权威资料，降低幻觉风险（相较通用法律聊天机器人）
与Thomson Reuters内容库深度集成，已订阅Westlaw的律所升级路径清晰
2026版工作空间与法律文书起草工具提供案件专属上下文与代理式动议起草（超越基础问答）
无公开定价，需通过销售报价（通常与高价Westlaw合同捆绑）
未订阅Westlaw的律所价值显著下降（因研究引擎缺少数据源）
AI输出仍需律师核实引用与法律结论，方可用于提交或客户使用
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.