How to Use Westlaw AI in 2026: Step-by-Step Guide
Westlaw AI integrates generative AI into Thomson Reuters' comprehensive legal database — the most trusted legal research platform in the US. Ask legal questions in plain English, get case law summaries, statute analysis, and litigation insights, all grounded in Westlaw's authoritative primary sources.
Westlaw is the gold standard for American legal research, and Westlaw AI (powered by Thomson Reuters' CoCounsel and generative AI integration) brings conversational AI to the most comprehensive legal database available.
The Research Platform
Westlaw's database includes:
- Every federal and state court decision
- All federal and state statutes and regulations
- Secondary sources (treatises, law reviews, practice guides)
- International and foreign law in 50+ jurisdictions
When the AI answers a legal question, it grounds responses in this authoritative source material — not internet-scraped summaries.
AI Capabilities
Legal question answering — ask in plain English: "What's the standard for preliminary injunctions in the Ninth Circuit?" The AI synthesizes relevant case law and provides a reasoned answer with citations.
Case summarization — upload or identify a case; AI generates executive summaries, extracts key holdings, and identifies relevant precedents.
Statute analysis — point the AI at a statutory section; it explains plain-language meaning, identifies judicial interpretations, and flags circuit splits.
Litigation strategy — AI analyzes how courts have ruled on specific arguments to help attorneys assess case strength before filing.
Document review — identify relevant clauses, flag issues, and extract key terms from contracts and briefs.
CoCounsel Integration
Thomson Reuters integrates Microsoft Azure OpenAI models under the "CoCounsel" brand. CoCounsel is designed for attorney use with hallucination safeguards: every AI response is sourced to specific Westlaw documents, with clickable citations that let attorneys verify the underlying authority.
Audience
Used by 90%+ of Am Law 100 firms, federal government legal departments, and law schools. Subscription pricing is enterprise-scale — individual attorneys typically access through firm subscriptions.
Compliance
Thomson Reuters maintains attorney-client privilege protections in its data handling and has published specific assurances about not training AI on user queries.
What You'll Need
- A Westlaw AI account (starting from $0)
- A modern web browser or the Westlaw AI app
- Payment method for paid features
Getting Started
Create Your Account
Visit https://legal.thomsonreuters.com/westlaw and sign up for a paid account. You'll need an email address to register.
Start Your First Conversation
Once logged in, you'll see the main chat interface. Type a question or task in the input box and press Enter. Westlaw AI supports legal-research, case-law-analysis, statute-interpretation, litigation-strategy, document-review, citation-generation, precedent-analysis — start with a simple text prompt to get familiar.
Pro Tips
- Be specific: The more context you provide, the better the response. Instead of "write an email," try "write a professional follow-up email to a client who hasn't responded in two weeks."
- Iterate: If you don't get what you need, ask for clarification or refinement: "Make it shorter" or "Use a more formal tone."
- Use examples: Show Westlaw AI what format you want by including an example in your prompt.
- Save useful conversations: Most platforms let you name and revisit conversations — organize by project or topic.
Common Use Cases
Legal
AI assistants providing legal information, document drafting, and regulatory guidance.
Browse Legal chatbots →Research & Analysis
Chatbots that help with data analysis, literature review, and in-depth research tasks.
Browse Research & Analysis chatbots →Troubleshooting
- Responses seem generic or unhelpful
- Add more context to your prompt. Specify the audience, tone, length, and format you need. Try starting over with a clearer description of your goal.
- The tool isn't responding or is slow
- AI chatbots can experience high traffic. Refresh the page and try again. Check the service's status page if issues persist.
- Output is too long or too short
- Explicitly specify the length: "in 100 words," "as a brief summary," or "in detail with examples."
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Frequently Asked Questions
- Is Westlaw AI free to use?
- Westlaw AI requires a paid subscription, starting from $0.
- Do I need an account to use Westlaw AI?
- Yes, you need to create an account to use Westlaw AI.
- What can I use Westlaw AI for?
- Westlaw AI integrates generative AI into Thomson Reuters' comprehensive legal database — the most trusted legal research platform in the US. Ask legal questions in plain English, get case law summaries, statute analysis, and litigation insights, all grounded in Westlaw's authoritative primary sources.
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