What is Westlaw AI?
Westlaw Precision is Thomson Reuters' AI-enhanced legal research platform — combining the most trusted case law database in the world with generative AI that answers research questions in natural language, with every answer grounded in verified Westlaw sources.
Its AI Research feature lets lawyers describe a legal issue conversationally and receive a structured research memo with cited cases, statutes and secondary sources — in minutes rather than hours. KeyCite integration means every case cited can be checked for subsequent history instantly.
Westlaw has been the benchmark for legal research for decades, and Westlaw Precision adds AI without sacrificing the reliability and depth that lawyers depend on for high-stakes work.
Key Features
AI Research
Describe a legal issue and get a structured research memo with cited cases and statutes — in minutes.
KeyCite Integration
Every cited case links to KeyCite — instantly check if a case is still good law before citing it.
Quick Check
AI-powered brief analysis — paste your draft brief and get a list of relevant authorities you may have missed.
Case Summarisation
Summarises lengthy opinions instantly — extract holdings, reasoning and key facts without reading the full case.
Comprehensive Coverage
Federal and state case law, statutes, regulations, secondary sources and international law in one database.
Draft & Analyse
Drafts research memos and analyses documents using Westlaw's verified legal content as the foundation.
Pros & Cons
What we love
Most trusted legal database for case law
KeyCite is the best citation checker available
AI grounded in verified sources only
Quick Check finds missed authorities in briefs
Deep litigation research coverage
Watch out for
Premium pricing
Requires Westlaw subscription
Less focused on transactional/contract work
Frequently Asked Questions
Yes — Westlaw Precision is Thomson Reuters' branded name for Westlaw with AI features built in. It includes AI Research (natural language research queries), Quick Check (brief analysis) and AI-powered document drafting, all grounded in Westlaw's verified legal database.
Both are excellent and the right choice usually depends on which your firm already uses. Westlaw Precision has an edge for case law research and litigation work — its database and KeyCite are the gold standard. Lexis+ AI has a larger overall content library including more international coverage. Most litigators prefer Westlaw; opinions vary in other practice areas.
Westlaw Precision AI features are available to Westlaw subscribers — contact Thomson Reuters to upgrade your existing subscription or start a new one. Pricing is not publicly listed and is based on firm size and usage. A demo is available on their website.
Compare Alternatives