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Home › Compare › Westlaw AI vs vLex Vincent

Westlaw AI vs vLex Vincent: what lawyers say.

Short answer. Westlaw AI has net sentiment +6 on 268 public lawyer voices and vLex Vincent has +52 on 31, as of . vLex Vincent is ahead on this record: the two 90% bands do not overlap. Net is like minus dislike as a share of voices.

Westlaw AI

+6

net · band −3 to +14

268 voices Medium

vs
vLex Vincent

+52

net · band +24 to +70

31 voices Low

vLex Vincent ahead on this record: the two 90% bands do not overlap.

268 voices on Westlaw AI and 31 on vLex Vincent, 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. Westlaw AI is a legal research platform by Thomson Reuters; vLex Vincent is a legal research platform by vLex / Clio.

Side by side

Rates and bands, not raw totals.

Westlaw AIvLex Vincent
Voices on record26831
Like · mixed · dislike106 · 59 · 9122 · 2 · 6
Net like minus dislike, % of voices+6 90% band −3 to +14+52 90% band +24 to +70
ConfidenceMediumLow
Per 100 voices: like · dislike · name hallucinations40 · 34 · 1271 · 19 · 10
Latest voice

vLex Vincent has the higher net (+52 against +6) and the two 90% bands do not overlap. That describes who posts and how they feel, not which product is better. Difference in net: −46 points (Westlaw AI minus vLex Vincent).

By task

What they were doing when they posted.

TaskWestlaw AIvLex Vincent
Legal research210 voices · net +1321 voices · net +57
Citation checking11 voices · net −451 voice, too few for a net
Summarization11 voices · net −90 voices
General use31 voices · net −299 voices · net +56

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

Westlaw AI · complaints

  • Accuracy 112
  • Hallucination 32
  • Price 22

Westlaw AI · what they value

  • Time saved 61
  • Data coverage 30
  • Accuracy 29

vLex Vincent · complaints

  • Accuracy 5
  • Hallucination 3
  • Price 2

vLex Vincent · what they value

  • Data coverage 6
  • Time saved 4
  • Accuracy 2

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 Westlaw AI · verbatim

r/biglaw
“I use co counsel for litigation and i find it is much more accurate for litigation research than claude, chatgpt, or gemini.”

in “Harvey / Legora are awful.” · 38 voices

ValuesAccuracyUnverified voice
Original thread Share
37 more voices in this thread
  • r/biglaw · Oct 19, 2026CriticizesLegal SaaS platforms like Harvey and Legora are just wrappers around LLMs, and the author's firm built its own in-house platform and sees their valuations as unjustified. (summary, not a quote)open
  • r/biglaw · Oct 18, 2026HarveyValues“Boomer here, but I think Harvey is incredible.”open
  • r/biglaw · Oct 18, 2026HarveyValues“When you know what you are doing and what you want, Harvey is great IMO.”open
  • r/biglaw · Oct 17, 2026CoCounselNeutral“CoCounsel allows you to build workflows and combine with other sources too, though.”open
  • r/biglaw · Oct 17, 2026HarveyValues“The US caselaw search is better because you can combine it with other sources so you can have it look through a set of litigation documents and run caselaw research to help figure out their significance at the same time.”open
  • r/biglaw · Oct 17, 2026ClaudeValues“To be very clear, in my experience having these systems finely tuned to your individual work vs the level of tuning you can get out of harvey/cocounsel/co-pilot can represent 2-3x productivity increases.”open
  • r/biglaw · Oct 17, 2026HarveyValues“Harvey vault is amazing for working with discovery productions.”open
  • r/biglaw · Oct 16, 2026HarveyNeutral“Harvey also has a US Caselaw database where whichever model you pick will directly search for cases in the database.”open
  • r/biglaw · Oct 16, 2026CriticizesSays lawyers will not use raw coding or chat tools and need a wrapper around the model to make it usable. (summary, not a quote)open
  • r/biglaw · Oct 16, 2026HarveyNeutral“Harvey can be used with Astra 6 or Fable, your firm just has to agree to API pricing.”open
  • r/biglaw · Oct 16, 2026HarveyNeutral“Harvey uses the Chat GPT and Claude models and you can actually pick which model.”open
  • r/biglaw · Oct 16, 2026ChatGPTValues“What pisses me off is that our clients ARE using Claude and ChatGPT themselves and we’re stuck using these inferior models.”open
  • r/biglaw · Oct 16, 2026HarveyNeutral“Alls I know is that I can’t keep track of all the platforms so I stick to my mans Harvey even though the other mans might be better.”open
  • r/biglaw · Oct 16, 2026HarveyNeutral“You do realize that Harvey was literally just an interface to access Claude since day 1.”open
  • r/biglaw · Oct 15, 2026HarveyCriticizes“Harvey and Legora are inferior products, by magnitudes, and any firm that exclusively relies on these tools is falling behind in productivity and associate satisfaction.”open
  • r/biglaw · Oct 15, 2026ClaudeValues“If you are using Fable and you give it enough project data, it can function like your associate on that case who has a mastery of facts and super fast turnaround.”open
  • r/biglaw · Oct 15, 2026HarveyCriticizes“Harvey sucks because it's just an API built on top of open-source AI models, which are way behind the models currently available through openAI or Claude.”open
  • r/biglaw · Oct 15, 2026HarveyCriticizesYounger lawyers who grew up with general AI tools would be disadvantaged by using Harvey, while older lawyers can be forgiven for adopting it. (summary, not a quote)open
  • r/biglaw · Oct 15, 2026HarveyCriticizes“This is basically a fine tuned version of the Kimi K3 model which they claim is better but is clearly worse”open
  • r/biglaw · Oct 15, 2026HarveyNeutral“Harvey does have its own propriety model. And yes, if you select a specific model, only the output is generated by that model, not all of the intervening tasks.”open
  • r/biglaw · Oct 15, 2026HarveyNeutral“There is no “Harvey” model. Harvey just picks one of the models based on your prompt.”open
  • r/biglaw · Oct 15, 2026HarveyMixed“I like to think of Harvey as an energetic junior, does their best, a fine starting point, but doesn’t produce a product I’d be willing to send a client without a deeeep review”open
  • r/biglaw · Oct 15, 2026HarveyValues“Harvey's been killing it for me on the transaction side with the rote drafting and title work.”open
  • r/biglaw · Oct 15, 2026CoCounselValues“I’ve been really impressed and don’t see how a tool could be much better”open
  • r/biglaw · Oct 15, 2026CoCounselValues“I’ve been really impressed and don’t see how a tool could be much better”open
  • r/biglaw · Oct 15, 2026HarveyValues“I use Harvey daily and think it’s a fantastic product (as long as you use it to supplement, not replace your work product)”open
  • r/biglaw · Oct 15, 2026CoCounselValues“I use co counsel for litigation and i find it is much more accurate for litigation research than claude, chatgpt, or gemini.”open
  • r/biglaw · Oct 15, 2026HarveyCriticizes“Even when I add docs to a vault and ask for a review table, getting Harvey to actually “read” the docs is like pulling teeth.”open
  • r/biglaw · Oct 15, 2026ClaudeValues“Claude code with a syfert.com MCP (or a courtlistener MCP, or ding duff) is 500% better than Harvey and Legora.”open
  • r/biglaw · Oct 15, 2026HarveyMixed“It’s usually right but the times it isn’t it’s REALLY wrong.”open
  • r/biglaw · Oct 15, 2026HarveyCriticizes“I also do not think I’m getting real Opus 5 when I select it in Harvey. And it’s hella slow.”open
  • r/biglaw · Oct 15, 2026HarveyCriticizes“Harvey profits by arbitrating token costs, so they use the cheapest models they think can get away with for the bulk of response.”open
  • r/biglaw · Oct 15, 2026HarveyCriticizes“They came out years later than Harvey, when firms already adopted Harvey, but yeah, firms should abandon Harveyw”open
  • r/biglaw · Oct 15, 2026CoCounselValues“My firm has Harvey and CoCounsel, and I just use CC bc it has access to Westlaw.”open
  • r/biglaw · Oct 15, 2026HarveyCriticizes“It routinely gives me genuinely “lazy” answers that fail to address what are obviously critical aspects of the issue, in a way that is not true of Fable or Astra”open
  • r/biglaw · Oct 15, 2026HarveyCriticizes“The only reason firms choose Harvey is it doesn’t use our data to train its AI due to confidentiality, or else they are trash”open
  • r/biglaw · Oct 15, 2026HarveyCriticizes“All other tasks, such as the actual research, review, etc, are handled by whatever model Harvey wants, including their own shitty “proprietary” models.”open
r/LawFirm
“These companies move too slowly and, since they are subscription based, they have an incentive to use cheap (aka bad) AI models to save on costs.”

in “Why does my mid-sized firm continuously shove our “AI tools” down my throat?” · 4 voices

CriticizesAccuracyUnverified voice
Original thread Share
3 more voices in this thread
  • r/LawFirm · Oct 15, 2026ClaudeMixed“I've found that Haiku and Sonnet do not do as good a job and correcting errors that result from them makes me waste time.”open
  • r/LawFirm · Oct 13, 2026ChatGPTValues“There are some other minor details but that research workflow has proven to be exponentially better than I could ever do and still significantly better than lexis or westlaw AI were ever able to do for me.”open
  • r/LawFirm · Oct 13, 2026CoCounselMixed“Westlaw's CoCounsel will get you in the right zip code but its descriptions of the cases it finds for me are often still incorrect and need to be verified personally.”open
Hacker News
“What legal professionals actually pay for [...] is to give the AI access to a legal database of case law.”

in “Mike: open-source legal AI” · 7 voices

ValuesData coverageUnverified voice
Original thread Share
6 more voices in this thread
  • Hacker News · May 5, 2026ChatGPTValuesPro se litigant ran two years of federal litigation on a $20 ChatGPT plan for research, drafting and discovery, and forced a settlement. (summary, not a quote)open
  • Hacker News · May 2, 2026ChatGPTCriticizes“With ChatGPT and Claude, the risk is much higher, because you're basically uploading entire documents with potentially privileged material to a third party, as part of your prompt.”open
  • Hacker News · May 2, 2026HarveyMixed“LLMs are absolutely abysmal at legal research and analysis, and every week we are seeing reports of some lawyer being called out publicly for submitting a brief to a court with hallucinated case citations.”open
  • Hacker News · May 2, 2026MixedOpen-source legal AI is better and fine for general work, but insufficient for full research without near-complete case law coverage. (summary, not a quote)open
  • Hacker News · Apr 30, 2026CriticizesLegal professional says generic LLM wrapper is no replacement for Westlaw; cannot rely on it without recourse if wrong. (summary, not a quote)open
  • Hacker News · Apr 30, 2026ValuesLawyer uses AI extensively but manually reads every cited case and checks on Westlaw it is still good law. (summary, not a quote)open

On vLex Vincent · verbatim

r/Lawyertalk
“It is an excellent tool that saves an enormous amount of time, but you have to know how to use it i.e. very targeted prompts and keywords.”

in “Does everyone use AI?”

ValuesTime savedUnverified voice
Original thread Share
r/Lawyertalk
“Yes, I'm tracking the litigation offerings, and making some light use of Clio Work (really, vLex's offering) but the tasks I'm presently comfortable use it for (or for which it can save time) are rather elementary.”

in “Anthropic thinks solo practitioners should not use Claude ethically, unlike Google and OpenAI” · 28 voices

MixedAccuracyUnverified voice
Original thread Share
27 more voices in this thread
  • r/Lawyertalk · Apr 3, 2026ClaudeValues“I usually deidentify anyway, but I find Claude so much more useful.”open
  • r/Lawyertalk · Apr 3, 2026SpellbookValues“Not sure if you’ve used tools like Spellbook, but it’s extremely powerful for legal drafting and contract review.”open
  • r/Lawyertalk · Apr 3, 2026Lexis+ AICriticizes“Lexis AI produces case law that doesn’t say what Lexis claims it says for cases that are complex enough to actually research.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeNeutralThe consumer terms only say materials may be used for training unless the user opts out, with exceptions for feedback and safety review, so the claimed objectionable language is not there. (summary, not a quote)open
  • r/Lawyertalk · Apr 3, 2026ClaudeValues“Doesn’t feel great to buy more than you need but 150 a month is not extortionate for a lawyer using Claude for business.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeNeutral“I’m honestly floored at how many people do not know that the native chat is different from the API.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeValues“Claude is by far the best LLM in my opinion.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeValues“ChatGPT has a two seat minimum, which is less bad, but I prefer Claude.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeCriticizes“Anthropic’s consumer TOS is a privacy waiver. Full stop.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeNeutral“You can set up Claude with the equivalent Enterprise set up with claude api.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeValues“Anthropic also changed its policy to allow any user to opt out of information being used for model training, so it's all moot.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeValues“I exclusively use the API for legal work and it’s more powerful than the chat interface, and it’s way more expensive so Anthropic definitely wants companies to use it.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeValues“We have it at my firm, which is 30-35 lawyers, and it is very inexpensive relative to other software we use (e.g. Everlaw).”open
  • r/Lawyertalk · Apr 3, 2026ClaudeCriticizes“Claude still has rights to train on this data to improve their future models, and also to share with third parties at their will.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeCriticizes“If OpenAI and Google are willing to meet one-seat business users where they are, Anthropic forcing a five-seat jump makes Claude much harder to justify for anyone handling sensitive client or business material.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeCriticizes“The TOS still waives your right to privacy, grants Anthropic ability to share your chat with third parties unannounced, denies you any IP indemnification, the right to request immediate destruction of your data on their servers, amongst other things.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeNeutral“Im working on an internal tool that let's me sanitize, work in Claude, then rehydrate the output.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeNeutral“He thinks Claude is a better product, but Claude is inherently more expensive if he wants privacy protections.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeValues“I prefer to use the frontier models’ native interfaces instead of API hookups, as the quality of the system-prompted reply and experience has a marked difference (I am a non-developer and use the service mainly for research or problem solving).”open
  • r/Lawyertalk · Apr 3, 2026ClaudeCriticizes“There is no IP idemnification, and Anthropic still reserves the right to share your information with third parties.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeNeutralThe author prefers Claude's native interface over API hookups because the system prompts make the output noticeably better. (summary, not a quote)open
  • r/Lawyertalk · Apr 3, 2026ClaudeValues“If I use it to draft something, I have it use Plaintiff and Defendant and other generic terms. But from what I’ve tested, it is the best at actually outputting something useful.”open
  • r/Lawyertalk · Apr 3, 2026Lexis+ AICriticizes“The one closed AI that offer safety for lawyers is Lexi’s AI/protege. But it sucks *ss so bad.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeCriticizes“It's not a matter of honesty - if Claude can offer it to 5+ seat bundles, they can offer it to individuals, even if it's at a premium.”open
  • r/Lawyertalk · Apr 3, 2026ClaudeNeutralThe author replaces identifying details with pseudonyms before uploading documents, but notes that Claude sometimes works in a missed real detail. (summary, not a quote)open
  • r/Lawyertalk · Apr 3, 2026ClaudeCriticizesSays Anthropic does not offer individual users the business-level privacy terms that Google and OpenAI do. (summary, not a quote)open
  • r/Lawyertalk · Apr 3, 2026ClaudeCriticizes“Anthropic’s business-tier options require a five-seat minimum. That means you either pay for three or four extra empty seats, or stay on the consumer plan, which lacks the contractual privacy posture you need.”open
r/legaltech
“Vlex just produced a hallucination. You want something that works and you can trust them just spend the money on the big guys.”

in “Is unbundling research actually viable for Federal Lit?” · 2 voices

CriticizesHallucinationUnverified voice
Original thread Share
1 more voice in this thread
  • r/legaltech · Feb 8, 2026vLex VincentMixed“We’ve been trialing vLex (Vincent) because the AI summaries are decent, but the renewal quote is steep, and honestly, we barely touch the global/international databases.”open

When both come up in one thread

Voices from threads where posters name Westlaw AI and vLex Vincent. Open the thread for the whole exchange.

r/biglaw
Westlaw AI
“It's a great way for me to get started at looking into the cases but I always read the cases because sometimes their summaries are a bit suspect.”

in “Does anyone like AI for legal research?” · 10 voices

ValuesLegal researchUnverified voice
Original thread Share
9 more voices in this thread
  • r/biglaw · Jun 16, 2026Lexis+ AICriticizes“The Lexis AI stuff has been disappointing tbh. It feels like they bolted a chatbot onto their existing search without really solving the core problem, which is that you need to verify every single citation anyway so what's the point.”open
  • r/biglaw · Jun 13, 2026CoCounselValues“Getting pointed toward the right cases early makes the rest of the research process much faster”open
  • r/biglaw · Jun 11, 2026Lexis+ AICriticizes“I understand how transformational AI can be for transactional work, but I've found AI to be more or less useless when it comes to legal research.”open
  • r/biglaw · Jun 11, 2026LegoraValues“I thought the same, but we've started using Legora recently and I've been a bit blown away at how much it has helped with research.”open
  • r/biglaw · Jun 11, 2026ClaudeValues“I find deep research on Claude or ChatGPT to be really helpful - the quotes just sometimes have minor errors”open
  • r/biglaw · Jun 11, 2026Lexis+ AIMixed“I like to use Lexis Protege, but I don’t think Lexis’s natural language search is very good.”open
  • r/biglaw · Jun 11, 2026vLex VincentValues“I find Vincent AI to be good at finding helpful cases that can get you on the right track.”open
  • r/biglaw · Jun 11, 2026Westlaw AIMixed“I find the Westlaw AI search helpful to give me a point of entry into the cases, but I agree it never gives me the best case, and its narrative explanations of the cases are often inappropriately extrapolated/borderline hallucinated.”open
  • r/biglaw · Jun 11, 2026Westlaw AICriticizes“I have found the actual AI query-based searches to be 85% useless.”open
r/biglaw
vLex Vincent
“I find Vincent AI to be good at finding helpful cases that can get you on the right track.”

in “Does anyone like AI for legal research?” · 10 voices

ValuesTime savedUnverified voice
Original thread Share
9 more voices in this thread
  • r/biglaw · Jun 16, 2026Lexis+ AICriticizes“The Lexis AI stuff has been disappointing tbh. It feels like they bolted a chatbot onto their existing search without really solving the core problem, which is that you need to verify every single citation anyway so what's the point.”open
  • r/biglaw · Jun 13, 2026CoCounselValues“Getting pointed toward the right cases early makes the rest of the research process much faster”open
  • r/biglaw · Jun 12, 2026Westlaw AIValues“It's a great way for me to get started at looking into the cases but I always read the cases because sometimes their summaries are a bit suspect.”open
  • r/biglaw · Jun 11, 2026Lexis+ AICriticizes“I understand how transformational AI can be for transactional work, but I've found AI to be more or less useless when it comes to legal research.”open
  • r/biglaw · Jun 11, 2026LegoraValues“I thought the same, but we've started using Legora recently and I've been a bit blown away at how much it has helped with research.”open
  • r/biglaw · Jun 11, 2026ClaudeValues“I find deep research on Claude or ChatGPT to be really helpful - the quotes just sometimes have minor errors”open
  • r/biglaw · Jun 11, 2026Lexis+ AIMixed“I like to use Lexis Protege, but I don’t think Lexis’s natural language search is very good.”open
  • r/biglaw · Jun 11, 2026Westlaw AIMixed“I find the Westlaw AI search helpful to give me a point of entry into the cases, but I agree it never gives me the best case, and its narrative explanations of the cases are often inappropriately extrapolated/borderline hallucinated.”open
  • r/biglaw · Jun 11, 2026Westlaw AICriticizes“I have found the actual AI query-based searches to be 85% useless.”open
r/LawFirm
vLex Vincent
“Pretty much provides a Westlaw Mass Practice report. I've been impressed so far.”

in “Anyone tried Vincent AI? Anyone been impressed by any AI utilities?” · 9 voices

ValuesData coverageUnverified voice
Original thread Share
8 more voices in this thread
  • r/LawFirm · Jan 28, 2026vLex VincentCriticizes“I do not trust Vincent AI anymore my my data is gone after 3weeks!”open
  • r/LawFirm · Nov 10, 2025ChatGPTCriticizes“Frequent hallucinations and consistently misreading statutes/codes and numbers.”open
  • r/LawFirm · Apr 25, 2025Westlaw AICriticizes“I uploaded a federal regulation into westlaw and it broke/hallucinated on me to no end.”open
  • r/LawFirm · Apr 25, 2025Westlaw AIValues“It has significantly shortened research time probably by 75% for me.”open
  • r/LawFirm · Apr 25, 2025ChatGPTValues“I did the work on my own as well and the AI nailed every question—though it did get confused as to what I was trying to accomplish because my questions covered a few different scenarios, but that feels more like user error.”open
  • r/LawFirm · Apr 25, 2025ChatGPTValues“I’ve been impressed by chatgpt on smaller tasks.”open
  • r/LawFirm · Apr 25, 2025ClaudeValues“Claude 3.7 > ChatGPT.”open
  • r/LawFirm · Apr 25, 2025ChatGPTCriticizes“The time spent prompting, verifying, and correcting hallucinations has seemed equal to or greater than if I had just done the task without it.”open
r/LawFirm
Westlaw AI
“Westlaw is the best. Most accurate data so their answers are way more accurate than Lexis.”

in “Lexis AI vs. Westlaw AI vs. Fast case AI (vLex)?” · 3 voices

ValuesAccuracyUnverified voice
Original thread Share
2 more voices in this thread
  • r/LawFirm · Dec 21, 2025vLex VincentValues“We have been extremely happy and at half the price.”open
  • r/LawFirm · Dec 21, 2025Lexis+ AIValues“I feel the quality of all these legal AI platforms is improving at a rate where even the least expensive options are (or very soon will be) sufficiently helpful for assisting with core tasks of research, drafting, and case analysis”open

Short answers

From the same record as the tables above.

Westlaw AI vs vLex Vincent for lawyers: what do lawyers say?

Westlaw AI has net sentiment +6 on 268 public lawyer voices and vLex Vincent has +52 on 31, as of . vLex Vincent is ahead on this record: the two 90% bands do not overlap. Net is like minus dislike as a share of voices.

How many lawyers have posted about Westlaw AI and vLex Vincent?

We count 268 public voices on Westlaw AI and 31 on vLex Vincent, 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 Westlaw AI or vLex Vincent?

Net sentiment (like minus dislike, as a share of voices) is +6 for Westlaw AI, 90% band −3 to +14, and +52 for vLex Vincent, 90% band +24 to +70. vLex Vincent has the higher net (+52 against +6) and the two 90% bands do not overlap. That describes who posts and how they feel, not which product is better.

What do lawyers use Westlaw AI and vLex Vincent for?

The task named most often on Westlaw AI is legal research (210 of 268 voices); on vLex Vincent it is legal research (21 of 31 voices). A voice has one task, set by our classifier.

Task reports with both: Legal research report