CoCounsel vs Westlaw: Is CoCounsel Included in Westlaw?

CoCounsel and Westlaw are two separate Thomson Reuters products that overlap on purpose. Westlaw is the research platform holding federal and state primary law plus the KeyCite citator. CoCounsel is the AI layer that drafts, reviews documents, and runs multi-step research. A plain Westlaw subscription does not include CoCounsel, but the top CoCounsel Legal tier does include full Westlaw Advantage access, so the answer depends on which direction you buy from. This is informational, not legal advice.

This is the single most confused question in legal software buying right now, and the confusion is not the buyer's fault. Thomson Reuters sells a tier called CoCounsel Legal that contains Westlaw, and a different tier called Westlaw Advantage with CoCounsel Essentials that contains some CoCounsel. Both names contain both products. They are not the same purchase and they do not cost the same.

Is CoCounsel included in Westlaw?

No, not automatically. If you have a standard Westlaw subscription, you do not have CoCounsel. They are separate line items on the Thomson Reuters price sheet, and adding the AI capability is a distinct commercial decision with its own cost.

What muddies this is that Thomson Reuters now sells bundles running in both directions. As of July 2026 the CoCounsel Legal plans page lists four offerings: CoCounsel Legal, Westlaw Advantage with CoCounsel Essentials, Practical Law Dynamic Tool Set with CoCounsel Essentials, and CoCounsel Essentials on its own. Two of those four put Westlaw and CoCounsel capabilities in the same subscription. So the honest answer is that CoCounsel is not included in Westlaw by default, but there are named packages where the two ship together.

Is CoCounsel part of Westlaw?

They come from different places and are converging. Westlaw is the legacy Thomson Reuters research platform, decades old, built around the West Key Number System and the KeyCite citator. CoCounsel came from Casetext, the startup Thomson Reuters acquired in August 2023 for 650 million dollars in cash.

Since then the branding has settled into a fairly clean split: the primary law and the citator are Westlaw, and the generative and agentic AI is CoCounsel. You can still buy Westlaw with no AI component at all, and you can buy CoCounsel Essentials without full Westlaw research. What you cannot easily do is get the top CoCounsel Legal experience without also paying for Westlaw content, because that tier is defined by having it.

What is the difference between CoCounsel and Westlaw?

The cleanest way to think about it is that Westlaw finds the law and CoCounsel does something with it.

• Westlaw carries federal and state case law, statutes, and regulations, editorially enhanced with attorney-written headnotes indexed into more than 400 topics and over 98,000 points of law. It includes KeyCite, the citator that tells you whether an authority is still good law, and Litigation Analytics for how a specific judge has ruled.
• CoCounsel takes a request in plain language, shows its reasoning step by step, and returns work product: a draft, a tabular analysis across a document set, a revised clause, a deposition outline. The higher tiers add Deep Research, which plans and executes a multi-step research task rather than answering a single question.

Thomson Reuters markets CoCounsel Legal as reasoning from authoritative Westlaw primary law and Practical Law guidance under the trademarked phrase Fiduciary-Grade AI. Behind the branding, the real claim is that the model is grounded in content the vendor licenses rather than in whatever was scraped off the open web, which is the main reason a firm would pay incumbent prices for AI instead of using a general assistant. Our breakdown of CoCounsel Legal pricing and tiers goes through each configuration in detail.

Do I need both CoCounsel and Westlaw?

Only if you do both jobs. The test is simple and most firms already know the answer.

If your week involves reviewing contracts, building clause libraries, preparing depositions, and producing first drafts, the CoCounsel feature set is doing work a search tool genuinely cannot do, and pairing it with licensed primary law is a defensible spend. If your week is finding the on-point precedent, reading it, and citing it, then you are looking at buying a large amount of drafting tooling in order to reach a search box.

There is a third group worth naming: firms already renewing Westlaw Advantage anyway. For you this is not a platform decision, it is an add-on decision, and framing it that way is worth real money in the negotiation. The question is narrow, what does adding Essentials cost above the Advantage rate you are already paying, and narrow questions get better answers from sales reps than open ones.

How much does CoCounsel cost compared to Westlaw?

Here is the asymmetry that almost nobody points out. Thomson Reuters publishes a rate for Westlaw Advantage and publishes nothing for any CoCounsel tier.

The Westlaw Advantage plans and pricing page on the Thomson Reuters sales site lists 256.75 dollars per user per month for single-circuit coverage and 399.75 dollars per user per month for all states plus federal, with online pricing available to firms of up to 10 attorneys and a stated 12 percent saving on a 2-year term or 18 percent on a 3-year. All four CoCounsel offerings, by contrast, route to a pricing link and send firms above 10 attorneys to a sales representative. No figure is shown.

That gap is usable. Since CoCounsel Legal contains full Westlaw Advantage access, the published Advantage rate is effectively the floor underneath the tier you are being quoted. Price the component you can see, then ask what the rest is worth. Third-party sources put CoCounsel somewhere between 104 and 639 dollars per user per month, and specifically report around 639 dollars for Westlaw Advantage with CoCounsel Essentials, but none of those figures appear on a Thomson Reuters page. Treat them as somebody else's negotiated deal rather than as a price list. We work through the arithmetic in how much CoCounsel costs, and the Westlaw side is covered in Westlaw legal research.

What happened to Casetext?

Thomson Reuters completed the Casetext acquisition in August 2023, ran the product largely unchanged for about eighteen months, then shut the standalone product down on April 1, 2025. SmartCite, the Casetext citator, closed with it, and there is no self-serve successor to it.

The technology continues inside CoCounsel Legal, so on the engineering side this really is a continuation. The commercial model is what did not survive. Casetext sold month to month with a price on the website, in the range of 65 to 100 dollars per seat. The CoCounsel tiers are neither month to month nor priced in public. For a solo who signed up for a hundred dollar research tool, that is a different category of purchase, not a version upgrade. Our account of the Casetext shutdown has the full timeline.

Which one should a small firm actually buy?

Start by separating the two jobs legal research is really made of: finding the on-point authority, and confirming it is still good law. Incumbent platforms sell them as one product, which is why the bill looks the way it does.

If validation is your genuine need, you are buying a citator, and KeyCite arrives with the Westlaw content rather than with the AI. Adding CoCounsel does not make your citations safer. If drafting is your genuine need, CoCounsel Essentials is the relevant product and you should price it against standalone AI drafting tools, not assume the incumbent bundle is the cheapest path to the same capability.

And if what you mostly do is find cases, price that half on its own. Cases takes a legal question in plain English and returns on-point US federal and state precedents as headnote cards, each with the holding surfaced and a real citation, at a published 29 dollars per month with no sales call. It is not a citator and it does not draft your contracts; run the citation through whatever citator you have, which for a lot of US lawyers is the Authority Check included with a bar-provided Fastcase or vLex library. Our citator comparison lays out every option and what each costs.

One last practical note, whichever way you go. A research platform switch fails on adoption far more often than on features, and the firms that get value out of an expensive license are the ones that treat the rollout as a real onboarding program rather than a lunch-hour demo. Budget for the training, not just the seats.

The short version

CoCounsel is not included in a standard Westlaw subscription. CoCounsel Legal, the top tier, does include full Westlaw Advantage. Westlaw Advantage with CoCounsel Essentials is a different and smaller bundle. Thomson Reuters publishes a rate for Westlaw Advantage alone and publishes nothing for any CoCounsel configuration, so the published Westlaw figure is the most useful anchor you have going into the conversation. Decide which of the two jobs you are actually buying before you compare the tiers, because the tier names will not tell you.

Informational research, not legal advice. Always verify the citation.