Does Harvey AI Have Access to Live Case Law Like Lexis+ AI?

Does Harvey AI have live case law like Lexis+ AI? The short verdict

Yes, through a partnership, though not in the same way. Harvey, the legal AI platform made by Harvey, now pulls answers from LexisNexis U.S. primary law through a feature called Ask LexisNexis. Lexis+ AI (now sold as Lexis+ with Protégé, made by LexisNexis) is built on top of the full Lexis+ research platform.

The verdict in one sentence: Harvey fits firms building broad AI drafting, review and workflow tools across many practice groups; Lexis+ AI fits firms whose AI spending goes mostly to case law research and citation checking; Lexi, the AI paralegal in OpenLaw for Attorneys, fits small and mid-sized firms that want to automate intake, client communication, documents and billing, and it is not a case law database.

One disclosure: we build one of these tools. It gets one entry and one honest take, same as the rest. Lexi on lexi.law is made by OpenLaw. It is not getlexi.io, a different company that is also named Lexi.

Who this is for: firm owners, partners and administrators deciding where legal AI money goes.

Prices checked: October 2026. None of the three vendors publishes a full per-seat rate card, so treat every figure below as a starting point for negotiation.

How does Harvey get case law from LexisNexis?

Harvey gets case law through a strategic alliance with LexisNexis, announced on June 18, 2025. Under it, LexisNexis generative AI, U.S. primary law and Shepard's Citations are built into Harvey, and the two companies build legal workflows together.

The product of that deal is Ask LexisNexis. Harvey says it announced the feature on August 12, 2025, in open beta for all Harvey users. According to Harvey, users ask questions in plain English and get citation-backed answers grounded in:

• Case law: U.S. federal and state decisions
• Statutes and codes: statutes and administrative codes
• Agency material: agency decisions
• Validation: Shepard's Citations, which show whether a cited authority is still good law

The answers come from LexisNexis's own fine-tuned models running on LexisNexis infrastructure, not from Harvey's general models. Harvey also says citations link to the full text.

Do Harvey users need a Lexis subscription?

No, not for the basic case law access. LawSites reported that the companies said Harvey customers would not need to subscribe to LexisNexis Protégé to get U.S. primary law and Shepard's Citations in Harvey. Some co-developed workflows, such as the Motion to Dismiss drafting workflow, have been described as tied to Ask LexisNexis access or a Lexis+ with Protégé subscription, so check your own contract.

What is still different from Lexis+ AI?

The main gap is coverage. Ask LexisNexis is described as U.S. primary law. Lexis+ AI gives you whatever the Lexis+ library includes under your subscription, and that can include secondary sources and practice content. If your lawyers rely on treatises, practice guides or deep Shepard's reports, Lexis+ AI is still where that work happens. For more on how these research tools are changing, see how AI is transforming legal research.

Can Harvey AI cite real cases like Lexis+ AI does?

Yes, when the answer comes from Ask LexisNexis. In that case the citations point to real authorities in the LexisNexis collection and are checked with Shepard's. Answers from Harvey's general assistant, without that grounding, should be checked as closely as any other AI output.

LexisNexis describes Lexis+ with Protégé as linking answers to primary law and running a Shepard's citation agent. That agent checks whether a reference in a response matches a real, verifiable source in LexisNexis content.

Neither tool takes away a lawyer's duty to check. ABA Formal Opinion 512 (July 29, 2024) warns that generative AI tools can produce "hallucinations." It also says relying on AI output without an appropriate degree of independent verification could break the duty of competence under Model Rule 1.1. Read every case before you cite it, whichever tool found it.

How much does Harvey AI cost compared to Lexis+ AI?

Harvey usually costs much more per seat and needs a larger minimum purchase. Harvey publishes no price list. Third-party reports put mid-market seats at roughly $1,000 to $2,000 per user per month, with minimums of 25 to 50 seats on 12-month contracts. Those are reported numbers, not official ones.

Lexis+ AI is also sold by quote. The base Lexis+ seat, without AI, has been reported at about $171 per month for a single user on the LexisNexis online store, as of October 2026. All-in Lexis+ with Protégé quotes for firms are reported at roughly $250 to $500 per seat per month, depending on firm size and content packages.

Two questions to ask in any Harvey negotiation:

• Ask LexisNexis: Is it included in your seat price, and will it stay included at renewal?
• Workflows: Do the co-developed litigation workflows need a separate Lexis+ with Protégé license?

To work out whether the spend pays back, see the ROI of AI for law firms.

Are Harvey AI and Lexis+ AI safe for confidential legal work?

Both are built for confidential work, with enterprise contracts that bar training on your data. That contractual protection is the key difference from the consumer chatbots courts have now looked at.

In United States v. Heppner, Judge Jed S. Rakoff of the U.S. District Court for the Southern District of New York ruled from the bench on February 10, 2026, with a written opinion on February 17, 2026. He held that documents a criminal defendant created with the consumer version of Anthropic's Claude were protected by neither attorney-client privilege nor the work product doctrine. The court pointed to terms that let the provider use prompts for training and disclose data to regulators. It also noted that the defendant acted on his own, not at counsel's direction.

For firms, the lesson is practical:

• Use enterprise tools: pick vendors whose terms bar training and limit retention, as Harvey, LexisNexis and Lexi say they do.
• Direct the use: lawyers should direct how AI is used on a matter, which supports work product claims.
• Read the terms: keep a dated copy of each vendor's terms and security addendum in your file.

ABA Formal Opinion 512 adds the duty of confidentiality under Model Rule 1.6. Before putting client information into any AI tool, a lawyer must understand how the tool handles it. Our guide to SOC 2 compliance for legal tech covers what to ask for.

Where does Harvey still win, and where does Lexis+ AI still win?

Each tool wins at its main job. Harvey is the wider platform. Lexis+ AI is the deeper research library.

Where Harvey still wins

• Breadth: drafting, document review and custom workflows across transactional and litigation teams, not just research.
• Workflow building: firms can build repeatable, firm-specific processes for many practice groups.
• Lexis content without a full Lexis seat: Ask LexisNexis brings U.S. primary law and Shepard's into the same workspace.

Where Lexis+ AI still wins

• Research depth: the full Lexis+ library your subscription covers, not only primary law answers.
• Citation tools: Shepard's and Shepard's Verify work across research and drafts.
• Entry cost: a smaller firm can buy it without the large seat minimums reported for Harvey.

Can firms use both Harvey and Lexis+ AI?

Yes, and many large firms do. The alliance was built for that: some Harvey workflows are described as available to Harvey customers who are also Lexis+ with Protégé customers.

Paying for both makes sense when you have separate needs. One is firm-wide drafting and workflow automation, where Harvey fits. The other is a research team that lives in Lexis+, where Lexis+ AI fits. It makes less sense for a small litigation firm. There, Ask LexisNexis inside Harvey may overlap with what you already pay LexisNexis for, or Lexis+ AI alone may cover the research.

Before renewing either contract, list which tasks each tool really handles. Drop the overlap, then negotiate.

How does Lexi compare to Harvey AI?

Lexi does a different job. Harvey and Lexis+ AI help lawyers research and draft. Lexi runs the firm's operational work: intake and scheduling, client updates the attorney approves, engagement letters, document collection, filing preparation, payments and matter updates. It connects to tools such as Clio Manage and Google Calendar.

Lexi does not do everything Harvey does, and it has no case law database to compete with LexisNexis. A small firm could pair Lexi with Lexis+ AI for research and still spend less than a Harvey seat minimum. To see which tools Lexi can replace, read what Lexi replaces.

Should you choose Harvey, Lexis+ AI or Lexi?

Pick by the work that eats most of your hours.

• Choose Harvey if: you have dozens of lawyers across practice groups, want one AI platform for drafting, review and custom workflows, and can meet a multi-seat annual commitment.
• Choose Lexis+ AI if: most of your AI value comes from case law research, citation checking and research-based drafting, or you already license Lexis+.
• Choose Lexi if: your bottleneck is intake, client communication, documents and billing rather than research, and you are a small or mid-sized firm.

The verdict: Harvey now does have Lexis-grounded case law, so "Harvey can't research" is no longer a reason to rule it out. If research depth is what you are buying, Lexis+ AI is still the more complete tool for the money. For a structured way to compare vendors, use our guide on how to choose the right AI tool for your law firm.