Lexis+ AI
LexisNexis / lexisnexis.com
AI-powered legal research platform with Lexis+ AI for case law research, summarisation, and brief drafting.
Pricing
Free
Free plan
No
Category
Legal AI
Platforms
3
Rating
4.4 (4800)
Free plan
No
API access
Yes
Open source
No
Platforms
3
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What is Lexis+ AI?
Lexis+ AI is LexisNexis's AI-powered legal research platform used by 500,000+ legal professionals for AI-powered case law research, statute summarisation, brief drafting, and contract analysis. Built on GPT-4 with access to LexisNexis's 140-year legal database. AI features include Lexis+ AI for conversational legal research, AI-generated briefs with citations, contract analysis, and AI legal summaries with source verification.
How Lexis+ AI works
Lexis+ AI runs as generative ai and rag software built around text and data workflows. Users typically start with a prompt, upload, or connected data source, and the underlying model handles the heavy lifting before returning a result you can refine or export. It's available on web, ios, and android, with API access for teams that want to embed it into their own products.
What makes it worth shortlisting
The capabilities that matter most for teams evaluating Lexis+ AI.
Conversational AI legal research
Practical for lawyers, legal professionals, and law students wanting ai-powered legal research backed by the most comprehensive legal database. without extra setup.
AI-generated brief summaries with citations
Practical for lawyers, legal professionals, and law students wanting ai-powered legal research backed by the most comprehensive legal database. without extra setup.
140-year LexisNexis legal database integration
Practical for lawyers, legal professionals, and law students wanting ai-powered legal research backed by the most comprehensive legal database. without extra setup.
Contract analysis and comparison
Practical for lawyers, legal professionals, and law students wanting ai-powered legal research backed by the most comprehensive legal database. without extra setup.
500,000+ legal professional users
Practical for lawyers, legal professionals, and law students wanting ai-powered legal research backed by the most comprehensive legal database. without extra setup.
AI hallucination checking against LN database
Practical for lawyers, legal professionals, and law students wanting ai-powered legal research backed by the most comprehensive legal database. without extra setup.
Best use cases
Who should use it
Pros
- Most comprehensive legal database (140 years)
- AI citations verified against LexisNexis database
- 500,000+ legal professional user base
- Hallucination mitigation via database grounding
- GPT-4 with legal fine-tuning
Cons
- Expensive subscription
- AI quality varies for niche legal questions
- Less known than Google for informal legal research
- Less powerful than Harvey for complex transactions
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Is it worth the price?
Custom law firm and enterprise pricing; bundled with Lexis+ subscription; demo required
Model
Subscription
Starting price
Free
Free trial
Yes
Tools like Lexis+ AI
Westlaw AI (Thomson Reuters equivalent)|Harvey (BigLaw AI)|Casetext (acquired by Thomson Reuters)|vLex (international legal AI)|Fastcase (free legal research)
Lexis+ AI vs Clio AI
A side-by-side look at the closest alternative in this category.
Lexis+ AI
LexisNexis
Clio AI
Clio
Custom law firm and enterprise pricing; bundled with Lexis+ subscription; demo required
Starter from $49/user/month; Boutique from $69; Elite from $109; Enterprise custom; 7-day trial
Lawyers, legal professionals, and law students wanting AI-powered legal research backed by the most comprehensive legal database.
Solo practitioners and law firms wanting AI-powered practice management to reduce administrative burden and improve billing accuracy.
SOC 2 Type II; GDPR DPA; FedRAMP for government legal; attorney-client privilege; client data not used for training
SOC 2 Type II; GDPR DPA; HIPAA BAA; attorney-client privilege protections; data not sold
- Most comprehensive legal database (140 years)
- AI citations verified against LexisNexis database
- 500,000+ legal professional user base
- Hallucination mitigation via database grounding
- GPT-4 with legal fine-tuning
- Most widely used law practice management platform
- Clio Duo AI genuinely useful
- 150,000+ legal professional validation
- 250+ integration ecosystem
- Trust accounting built-in
- Expensive subscription
- AI quality varies for niche legal questions
- Less known than Google for informal legal research
- Less powerful than Harvey for complex transactions
- Expensive at scale
- Clio Duo still maturing
- Less powerful for large law firms
- Document management less strong than iManage
Technical & deployment info
Key facts about model providers, platforms, and team support.
Model Provider
OpenAI + LexisNexis
Models
GPT-4, LexisNexis AI
Platforms
Web, iOS, Android
Deployment
Cloud
Integrations
Microsoft 365, Word, Thomson Reuters, DMS systems
Team Collaboration
Yes
Launch Year
1970
Security & privacy
Compliance signals and data-handling notes as reported by the vendor.
SOC 2 Type II; GDPR DPA; FedRAMP for government legal; attorney-client privilege; client data not used for training
What users are saying
Verified reviews from signed-in users, stored in the backend and averaged into this tool's rating.
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Common questions about Lexis+ AI
Editorial Verdict
Should you use Lexis+ AI?
Lexis+ AI is the most trusted AI for legal research -- its 140-year database integration mitigates hallucination risk that plagues general AI tools for legal citations.
Last verified July 1, 2025.