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Home › Compare › Harvey vs Lexis+ AI

Harvey vs Lexis+ AI: what lawyers say.

Short answer. Harvey has net sentiment −21 on 749 public lawyer voices and Lexis+ AI has −14 on 294, as of . It is a tie on this record: the two 90% bands overlap. Net is like minus dislike as a share of voices.

Harvey

−21

net · band −26 to −15

749 voices High

vs
Lexis+ AI

−14

net · band −23 to −6

294 voices Medium

A tie on this record: the two 90% bands overlap, so read the tasks and complaints below.

749 voices on Harvey and 294 on Lexis+ AI, all public posts by lawyers and people who work with them, since 2023. This is how they describe using each tool, not a test of the tools. Harvey is a legal AI assistant by Harvey AI; Lexis+ AI is a legal research platform by LexisNexis.

Side by side

Rates and bands, not raw totals.

HarveyLexis+ AI
Voices on record749294
Like · mixed · dislike204 · 101 · 35994 · 46 · 136
Net like minus dislike, % of voices−21 90% band −26 to −15−14 90% band −23 to −6
ConfidenceHighMedium
Per 100 voices: like · dislike · name hallucinations27 · 48 · 532 · 46 · 11
Latest voice

The two 90% bands overlap, so on this record the two cannot be told apart by net sentiment. Read the tasks and the complaints below instead of the headline number. Difference in net: −7 points (Harvey minus Lexis+ AI).

By task

What they were doing when they posted.

TaskHarveyLexis+ AI
Legal research56 voices · net −11184 voices · net −10
Drafting59 voices · net +2018 voices · net −11
Contract review43 voices · net +120 voices
Citation checking6 voices · net −6717 voices · net −47
Discovery10 voices · net +201 voice, too few for a net
Summarization19 voices · net +1110 voices · net −40
General use545 voices · net −3061 voices · net −10

Net here is plain like minus dislike as a share of that task’s voices, with no band: a task needs 5+ voices on a side to show one. Tasks with fewer on both sides are left out. A voice has one task, set by our classifier.

What they complain about and value

Harvey · complaints

  • Accuracy 156
  • Price 146
  • Privacy 46

Harvey · what they value

  • Time saved 72
  • Ease of use 50
  • Accuracy 29

Lexis+ AI · complaints

  • Accuracy 132
  • Hallucination 32
  • Price 26

Lexis+ AI · what they value

  • Time saved 47
  • Accuracy 25
  • Data coverage 23

Counts are voices that name that complaint or value (top three per tool). A voice can name one of each. Not a comparison of raw totals: the bigger side has more posts of every kind.

In their own words

Each quote is a verbatim span of a counted voice, with its date and a link to the original.

On Harvey · verbatim

Hacker News
“Lawyer here: Harvey was never very good, or useful. It mostly exists so large law firms can say they do AI.”

in “Claude for Legal” · 9 voices

CriticizesPrice, valueSelf-described lawyer
Original thread Share
8 more voices in this thread
  • Hacker News · May 15, 2026ClaudeCriticizes“Everyone is busy discussing how amazing is this collection of markdown files for Claude... which Claude is known to randomly ignore.”open
  • Hacker News · May 15, 2026ClaudeCriticizes“These companies have marketed their products so badly (or well, depending on your viewpoint) that lawyers think that these tools are glorified search engines. Then they get busted in court because the LLM made up citations, quotations etc.”open
  • Hacker News · May 15, 2026ClaudeValuesCautiously optimistic about Claude's agent approach for legal drudgery, but lawyers remain accountable, not Anthropic. (summary, not a quote)open
  • Hacker News · May 15, 2026LegoraCriticizes“I have a friend that runs a firm and uses Legora and can’t stand it.”open
  • Hacker News · May 15, 2026ClaudeCriticizes“I think we should be realistic here, this is a more advanced version of those "will kits" that spit out a PDF.”open
  • Hacker News · May 14, 2026HarveyCriticizes“There's other companies that have a much better understanding of the market and compliance issues but you don't hear about them because nobody wants to talk about legal tech.”open
  • Hacker News · May 14, 2026ClaudeMixed“As a lawyer, I'm excited about this, but there are two roadblocks that I'm not sure how Anthropic will navigate:”open
  • Hacker News · May 14, 2026ClaudeNeutral“It seems like they ripped out Lexis, which is probably one of the most important tools for lawyers: https://github.com/anthropics/claude-for-legal/pull/5 .”open
Hacker News
“That benchmark in the report clearly shows that there is not much added value or moat in the custom training of Harvey.”

in “AI Market Clarity”

CriticizesBenchmarkUnverified voice
Original thread Share
Hacker News
“I believe that [...] this startup will win by having the UX that is best focused on lawyers and addresses lawyers' compliance concerns.”

in “Most AI startups are doomed” · 2 voices

ValuesEase of useUnverified voice
Original thread Share
1 more voice in this thread
  • Hacker News · Nov 28, 2023ValuesGenerative AI can speed lawyer workflow since legal documents are mostly configurable boilerplate; fake-citation cases were careless. (summary, not a quote)open

On Lexis+ AI · verbatim

r/LawFirm
“If you’re ok with those then it’s silly to be concerned with lexis.”

in “Protege with client data” · 3 voices

ValuesGeneral useUnverified voice
Original thread Share
2 more voices in this thread
  • r/LawFirm · Sep 21, 2026Lexis+ AINeutral“The firm rule you already have is the right floor: written no-train and confidential handling before any client data goes in. Protege Enterprise can meet that bar on paper.”open
  • r/LawFirm · Sep 21, 2026Lexis+ AINeutral“If your practice group cant name those four things, Protege is still a trust exercise.”open
r/Lawyertalk
“My firm has Lexis Protege AI which I use mostly for AI-assisted legal research and simple motion drafting, but I feel that I'm probably missing out on its full potential.”

in “Lexis Peotege”

NeutralResearchSays: works at a law firm
Original thread Share
Hacker News
“It didn't feel drastically different from using ChatGPT with the ability to search the web [...]”

in “AI outperforms law professors in Stanford Law study” · 9 voices

MixedResearchUnverified voice
Original thread Share
8 more voices in this thread
  • Hacker News · Jun 3, 2026CriticizesLLM-drafted motions look good and usually pass unnoticed but are ethically dubious and hard for a human to catch, and reviewers grow lazier as the models improve. (summary, not a quote)open
  • Hacker News · Jun 3, 2026MixedAI often outperforms knowledge workers, but only with the right questions and correction, and unchecked errors could be catastrophic in high-risk fields like legal work. (summary, not a quote)open
  • Hacker News · Jun 3, 2026Lexis+ AIValues“This is where AI offerings from Thomson or Lexis could shine, especially in jurisdictions where case law is not freely available online.”open
  • Hacker News · Jun 3, 2026MixedAI chatbots can save some work, but their knowledge cutoff means they miss recent case law, so professionals relying on them risk personal liability and may have to redo the work. (summary, not a quote)open
  • Hacker News · Jun 3, 2026ChatGPTMixed“They are unbelievable at finding niche cases you would never have found on your own.”open
  • Hacker News · Jun 3, 2026GeminiNeutral“NotebookLM was considered slightly better than 2.5 Pro by the evaluators.”open
  • Hacker News · Jun 3, 2026NeutralUses a coding agent to do initial legal research and drafting, pulls the full text of cited laws, then has Gemini look for issues and criticize the draft. (summary, not a quote)open
  • Hacker News · Jun 3, 2026GeminiCriticizesAsked Gemini about personal conflicts; found it too conservative and shallow, so handles serious matters himself, using AI only for templated text. (summary, not a quote)open

When both come up in one thread

Voices from threads where posters name Harvey and Lexis+ AI. Open the thread for the whole exchange.

r/Lawyertalk
Lexis+ AI
“I’ve caught even Lexis’s AI making mistakes.”

in “Freakin' Baby Lawyers and AI” · 4 voices

CriticizesAccuracyUnverified voice
Original thread Share
3 more voices in this thread
  • r/Lawyertalk · Oct 21, 2026ChatGPTCriticizesThe author reported a lawyer to the bar for filings with misleading precedents invented by ChatGPT and for feeding client data into AI. (summary, not a quote)open
  • r/Lawyertalk · Oct 20, 2026HarveyValues“Now using Harvey. It is quite worrisome what it can do..”open
  • r/Lawyertalk · Oct 20, 2026ChatGPTCriticizes“Some of the worst lawyering I’ve ever seen has come from lawyers asking ChatGPT how to cross-examine a witness.”open
r/Lawyertalk
Harvey
“Now using Harvey. It is quite worrisome what it can do..”

in “Freakin' Baby Lawyers and AI” · 4 voices

ValuesGeneral useUnverified voice
Original thread Share
3 more voices in this thread
  • r/Lawyertalk · Oct 21, 2026ChatGPTCriticizesThe author reported a lawyer to the bar for filings with misleading precedents invented by ChatGPT and for feeding client data into AI. (summary, not a quote)open
  • r/Lawyertalk · Oct 21, 2026Lexis+ AICriticizes“I’ve caught even Lexis’s AI making mistakes.”open
  • r/Lawyertalk · Oct 20, 2026ChatGPTCriticizes“Some of the worst lawyering I’ve ever seen has come from lawyers asking ChatGPT how to cross-examine a witness.”open
r/legaltech
Harvey
“Harvey probably has even more of a moat because of confidentiality issues with most AI products, you might need to disclose to opposing counsel or the court which tool you are using, and Harvey is the one least likely to cause a problem because most of biglaw uses it.”

in “I think Legora may be strategically screwed” · 12 voices

ValuesGeneral useUnverified voice
Original thread Share
11 more voices in this thread
  • r/legaltech · Oct 10, 2026ValuesThe author's own command-line code on the same foundation LLM matches or beats Harvey and Legora prompts for general contract review, so output quality, ease of use and price are not the barrier. (summary, not a quote)open
  • r/legaltech · Sep 21, 2026ClaudeMixed“Claude has degraded to the point where it is actually useless. It cannot follow instructions, it cannot see the big picture, and it is a terrible writer.”open
  • r/legaltech · Sep 17, 2026LegoraCriticizes“I can't stand the card-based Word Add In interface.”open
  • r/legaltech · Sep 15, 2026ChatGPTCriticizes“I doubt it's blatant but they'll be using something- your prompts, telemetry, an AI summary of your usage- all technically not your data.”open
  • r/legaltech · Sep 15, 2026LegoraCriticizes“Based on all of our conversations, they don't have a meaningful edge on any of those.”open
  • r/legaltech · Sep 15, 2026CoCounselValues“CoCounsel 1.0 and 2.0 sucked. CoCounsel 3.0 is much much better.”open
  • r/legaltech · Sep 15, 2026HarveyMixed“Midtier AI comfortable users found Harvey interesting and potentially useful and I am considering getting them subscriptions to use what is basically a wrapper.”open
  • r/legaltech · Sep 15, 2026Lexis+ AIValues“Lexis has proprietary content, Shepard, and decades of embedded distribution. That’s an actual moat independent of WL.”open
  • r/legaltech · Sep 15, 2026HarveyCriticizes“I personally think legora and Harvey prove that we are in a bubble. Literally gpt wrappers.”open
  • r/legaltech · Sep 14, 2026LegoraValues“As a question of motive yes, possibly, but Harvey and Legora are using the frontier models under the hood anyway and if you pay the frontier labs for a contract they will agree not to train on your data.”open
  • r/legaltech · Sep 14, 2026ChatGPTValues“The enterprise/business plan of a frontier model, particularly Claude or ChatGPT, is much better.”open
r/legaltech
Lexis+ AI
“I think there’s also a comfort level because Lexis notes what is a hit from their database. This would ideally cut the risk of hallucinations.”

in “OpenAI releases Astra for Law with a legal search index covering 230 million URLs” · 3 voices

ValuesAccuracyUnverified voice
Original thread Share
2 more voices in this thread
  • r/legaltech · Sep 18, 2026Lexis+ AIValues“Yeah, your points are why I will likely just to stick with Protege and stick with it so we shift liability and increased support.”open
  • r/legaltech · Sep 17, 2026HarveyCriticizes“I am struggling to see what long proposition these companies are offering to clients for what the cost will likely be.”open

Short answers

From the same record as the tables above.

Harvey vs Lexis+ AI for lawyers: what do lawyers say?

Harvey has net sentiment −21 on 749 public lawyer voices and Lexis+ AI has −14 on 294, as of . It is a tie on this record: the two 90% bands overlap. Net is like minus dislike as a share of voices.

How many lawyers have posted about Harvey and Lexis+ AI?

We count 749 public voices on Harvey and 294 on Lexis+ AI, posted since 2023 by lawyers and people who work with them, as of . Each voice is one post or comment that names the tool.

Do lawyers feel better about Harvey or Lexis+ AI?

Net sentiment (like minus dislike, as a share of voices) is −21 for Harvey, 90% band −26 to −15, and −14 for Lexis+ AI, 90% band −23 to −6. The two 90% bands overlap, so on this record the two cannot be told apart by net sentiment. Read the tasks and the complaints below instead of the headline number.

What do lawyers use Harvey and Lexis+ AI for?

The task named most often on Harvey is general use (545 of 749 voices); on Lexis+ AI it is legal research (184 of 294 voices). A voice has one task, set by our classifier.

Task reports with both: Legal research report · Drafting report · Summarization report