Direct answer
What is CoCounsel?
CoCounsel Legal is an AI assistant from Thomson Reuters that automates legal research, document analysis, and drafting using verified content from Westlaw and Practical Law.
CoCounsel Legal brings agentic AI workflows to legal practitioners across law firms, corporate legal departments, and government agencies. Built to operate like an experienced associate, it interprets plain-language legal instructions, devises multi-step plans, executes research, and produces cited drafts. The platform combines Thomson Reuters proprietary databases—including Westlaw primary law, KeyCite flags, and Practical Law practice notes and checklists—with an organization's internal document stores. The system handles core legal tasks such as complex query decomposition, tabular review across up to 10,000 files, litigation document analysis, and brief building. Rather than requiring specialized prompt engineering, CoCounsel provides transparent reasoning paths, allowing lawyers to inspect each intermediate step and click through directly to authoritative source citations. Integration extends to Microsoft Word, Outlook, Teams, Claude via Model Context Protocol (MCP), and enterprise document management systems.
Unlike generic language models, CoCounsel Legal reasons directly over authoritative Westlaw case law and Practical Law editorial resources, validating citations, surfacing KeyCite flags, and maintaining enterprise governance with SOC 2 and ISO 42001 compliance without training models on customer data.
Product capabilities
Key features
Deep Research
Executes multi-step legal research plans against Westlaw and Practical Law, explaining reasoning and synthesizing cited reports from authoritative legal sources.
Tabular Analysis
Automates document review across up to 10,000 documents against 100 questions, returning structured tables with answers footnoted directly to source pages.
Westlaw Brief Builder
Structures litigation briefs from issue framing through argument drafting, grounding legal claims in controlling authority and Practical Law templates.
Litigation Document Analyzer
Processes complaints, discovery, and filings to extract facts, highlight potential mischaracterizations of law, and flag unverified citations.
Matter Workspaces
Organizes documents, precedents, prior positions, and research history per matter so historical context guides ongoing agentic reasoning.
Microsoft 365 Drafting
Drafts and edits directly inside Microsoft Word and Outlook, reading source exhibits, cross-referencing defined terms, and inserting linked citations.
Workflow
How CoCounsel works
- The user provides a plain-language legal prompt or matter instruction.
- CoCounsel generates an inspectable, step-by-step reasoning plan.
- The AI retrieves context from Westlaw primary law, Practical Law guides, or uploaded firm files.
- Drafts or tabular document extractions are generated with linked citations for attorney verification.
- Work product is exported or edited directly within Microsoft Word, Outlook, or document management systems.
Practical fit
Who should use CoCounsel?
Multi-Document Due Diligence
Examine thousands of contracts or discovery files in Tabular Analysis to systematically evaluate compliance, clauses, and potential liabilities.
Brief and Pleading Preparation
Formulate legal arguments, verify controlling precedents, and redline litigation filings in Word using Westlaw Brief Builder and KeyCite flags.
Case Law and Precedent Research
Submit plain-language inquiries to Deep Research to receive structured memos synthesizing federal, state, and administrative legal authorities.
Contract Drafting and Redlining
Draft clauses, compare agreements against standard playbooks, and adapt language using Practical Law guides directly within Word.
Editorial assessment
Pros and limitations
Where it is strong
- Direct integration with proprietary Westlaw primary law and Practical Law editorial guidance
- Generates linked, verifiable citations and flags potentially hallucinated legal citations
- High-capacity tabular analysis capable of scanning up to 10,000 files across 100 questions
- Tight integration inside Microsoft Word, Outlook, Teams, and Claude via MCP
- Enterprise data protections backed by SOC 2 and ISO 42001 certifications with a zero model-training policy
Where to be careful
- No transparent public pricing; requires engaging sales for custom quotes
- Primary value depends heavily on existing or add-on subscriptions to Thomson Reuters legal databases
- Workflow depth is tailored strictly to legal practice rather than general enterprise operations
Commercial context
CoCounsel pricing
Thomson Reuters does not publish fixed list prices on its public website. Pricing is provided via sales quotes tailored to organization size and chosen content libraries as of September 2026. Prospective buyers should contact sales to verify current terms.
| Plan | Price | What it includes |
|---|---|---|
| CoCounsel Legal | Contact sales / Custom quote period based on firm size and licensing terms. Contact sales for pricing details. | |
| Westlaw Advantage with CoCounsel Essentials | Contact sales / Custom quote period based on firm size and licensing terms. Contact sales for pricing details. | |
| Practical Law Dynamic Tool Set with CoCounsel Essentials | Contact sales / Custom quote period based on firm size and licensing terms. Contact sales for pricing details. | |
| CoCounsel Essentials | Contact sales / Custom quote period based on firm size and licensing terms. Contact sales for pricing details. |
Pricing, limits, taxes, model access, and regional availability can change. Verify the purchase-critical details on the official pricing page linked under Sources.
Transparent ranking
Why CoCounsel scores 76.7
Each factor is scored on a 100-point scale, then combined using the public ToolsRank weights. Engagement and momentum stay at a neutral baseline until measured signals exist, so no tool can gain or lose position from numbers nobody recorded.
Compatibility
Languages, platforms, and integrations
Languages
- English
Platforms
- Web
- Microsoft Word
- Microsoft Outlook
- Microsoft Teams
Integrations & surfaces
- Microsoft Word
- Microsoft Outlook
- Microsoft Teams
- Claude
- iManage
- NetDocuments
- SharePoint
- HighQ
- DeepJudge
- Smokeball
- Box
- Litify
Community
Reviews and questions
No approved member reviews yet. Editorial factors above are the only rating on this page.
Reviews and questions come from Google-signed members and are checked by an editor before they appear.
Frequently asked
CoCounsel FAQ
What is CoCounsel Legal?+
CoCounsel Legal is an AI assistant developed by Thomson Reuters to perform multi-step legal research, analysis, and drafting grounded in Westlaw content, Practical Law guidance, and a firm's own documents.
Does CoCounsel Legal train models on user data?+
No. According to Thomson Reuters, user data remains private and secure, and customer data is never used to train underlying AI models.
How does CoCounsel integrate with existing legal software?+
CoCounsel integrates directly with Microsoft 365 applications (Word, Outlook, Teams), Claude via Model Context Protocol (MCP), and document repositories like iManage, NetDocuments, SharePoint, HighQ, Smokeball, and Box.
What is Tabular Analysis in CoCounsel?+
Tabular Analysis allows attorneys to run structured document reviews across up to 10,000 documents simultaneously, answering up to 100 questions per matter and providing footnoted references back to specific document pages.
Is a free trial available for CoCounsel?+
Thomson Reuters offers product demonstrations and free trials for specific plans upon request via their sales team, though access terms and eligibility are established by contacting sales.
