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Westlaw AI-Assisted Research: Thomson Reuters' one public AI price

Our verdict: Inside a pricing culture built on quotes, Thomson Reuters publishes exactly one self-serve AI number, and this is it: Westlaw Edge with AI-Assisted Research from $155.35/mo, on a three-year term, for firms up to ten attorneys. That makes it the cheapest published door into research-grade legal AI on this site — with two honest asterisks. It is a research tier, not an all-purpose assistant (drafting and document review live in CoCounsel, by quote), and the three-year commitment is the price of the price. For a small firm that lives on citation-grade research, it is the budgetable anchor; for one that wants breadth, weigh Paxton's $499 self-serve seat.

The short version:

What it is: Westlaw Edge with AI-Assisted Research — generative-AI answers grounded in the Westlaw database, inside the research platform whose citator your filings already answer to.
What it costs: a published from $155.35/mo, three-year term, for firms up to 10 attorneys — the only Thomson Reuters AI tier with a self-serve public price. Confirm current terms on the Westlaw pricing pages.
What it is not: CoCounsel. Deposition prep, document review, and the broader skills are separate, quote-priced products; Westlaw Precision with CoCounsel bundles are reported around $428/user/mo, unconfirmed.
The term trade: the low monthly number rides a 36-month commitment — price the full term, not the month, when comparing.

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See it explained

Any pricing shown in this video was current when it was recorded — check the vendor’s site for today’s price.

Westlaw Edge with AI-Assisted Research is the one Thomson Reuters AI product with a published self-serve price: from $155.35 per month on a three-year term for firms up to ten attorneys, delivering AI answers grounded in Westlaw.

What does AI-Assisted Research add to Westlaw?

You ask the research question in plain language; it answers from the Westlaw corpus with the supporting authorities linked, instead of handing you a results list to triage. For the daily grind of 'is there authority for X in this jurisdiction,' that collapses the search-skim-refine loop into a draft answer you verify.

Grounding matters here in a specific way: the answers cite into the same database — with KeyCite — that opposing counsel and the court will check your citations against. The duty to open and read every cited authority remains yours; the tool shortens the path to them, it does not sign the brief.

What does it cost, and what is the catch?

The published figure is from $155.35 per month for firms up to ten attorneys — on a three-year term. Over the term that is roughly $5,600 minimum, so evaluate it as a 36-month purchase, not a monthly one. Above ten attorneys, or for Precision tiers and CoCounsel bundles, pricing returns to quotes (third parties report Precision-with-CoCounsel around $428/user/mo; unconfirmed). Pricing basis: vendor-published starting price for the AI-Assisted Research tier; bundle figures third-party reported. Checked 2026-07-18.

What about confidentiality?

Confidentiality note: matter facts, client identities, and case strategy are protected by Model Rule 1.6 and its state versions. Before any of it reaches a third-party AI, get the vendor's data-handling and model-training terms in writing and check your state bar's guidance — ABA Formal Opinion 512 ties that diligence to the duty of competence. Our ethics and confidentiality guide lists the questions. Nothing here is legal or ethics advice.

Who is it the right call for?

Strong if…

Citation-grade research is the center of your practice and Westlaw is already the standard you answer to.
You want the cheapest published entry into research AI and can live with a 36-month term.
Your firm is ten attorneys or fewer — the published tier is sized exactly for you.
You prefer AI grounded in the database your filings will be checked against.

Maybe not if…

You need drafting, deposition prep, or document review — that is CoCounsel, priced by quote.
A three-year commitment to any research platform is more lock-in than you will accept.
You want one seat that does research and drafting and analysis — Paxton's $499 self-serve bundle is the published alternative.
Your research volume is too light to justify any dedicated database subscription.

Common questions

How much does Westlaw AI-Assisted Research cost?

Thomson Reuters publishes a starting price of $155.35 per month on a three-year term for firms up to ten attorneys — its one self-serve public AI price. Larger firms and Precision or CoCounsel bundles are quote-only.

Is Westlaw AI-Assisted Research the same as CoCounsel?

No. AI-Assisted Research is a generative-AI layer inside Westlaw Edge for research questions. CoCounsel is Thomson Reuters' broader AI assistant covering deposition prep, document review, and drafting, sold separately by quote.

Why is the monthly price so much lower than other legal AI?

The term. The $155.35 figure rides a 36-month commitment and covers the research tier only. Compare full-term cost and scope — roughly $5,600 minimum over three years for research AI — against self-serve monthly seats before deciding.

Do I still need to check the citations it gives me?

Yes, every one. The tool grounds its answers in Westlaw and links the authorities, but the professional duty to read what you cite — and the sanctions exposure for not doing so — stays with the lawyer.

Last reviewed: 2026-07-19. Nothing on this page is legal advice, an ethics opinion, or a recommendation to hire any provider.

Want the term math run before you sign?

A local AI consultant can price the three-year commitment against self-serve alternatives for your actual research volume, and set up the rollout if it wins — by zip code.

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