Lexis+ AI

Lexis+ AI (lexisnexis.com) is the AI-enhanced tier of LexisNexis, one of the two dominant legal research databases (alongside Westlaw). Where general AI models hallucinate legal citations — a serious professional liability — Lexis+ AI grounds every response in its actual case law database and verifies citations through Shepard's Citations, the gold standard for checking whether a case is still good law.

**What makes it different**

Legal AI has one unforgiving requirement: the cases you cite must be real and still valid. Lexis+ AI addresses this with a hallucination guard that cross-references every citation against the LexisNexis database and Shepard's signal indicators. Attorneys can ask research questions in plain English — 'What is the standard for preliminary injunctions in the Ninth Circuit?' — and receive an AI-generated summary with verified, linkable citations they can rely on.

**Core features**

Key capabilities include: AI-powered legal research with verified citations, document drafting for briefs, memos, and contracts, case summarization for rapid review of long decisions, Shepard's Citations integration for case validity checking, and client advice letters generated from research findings.

The platform also includes a 'Practical Guidance' layer that suggests relevant forms, checklists, and precedent documents alongside case law research.

**Who uses it**

Lexis+ AI is used by law firm attorneys (primarily associates doing research), in-house legal teams, paralegals, and legal academics. It requires an active LexisNexis subscription, which is typically licensed through law firms or legal departments rather than individual practitioners.

**Frequently Asked Questions**

How does Lexis+ AI prevent hallucinations? Every citation is verified against the LexisNexis case law database and cross-checked with Shepard's Citations before being presented. Is it better than Westlaw's AI? Both offer AI research tools; the choice typically comes down to which database your firm already licenses. Lexis+ AI has a slight edge in natural-language research UX; Westlaw AI (CoCounsel) has strong document analysis features.