Legal AI for Australian firms, compared honestly
Most legal AI comparisons are written by whoever is selling. This one names the cases where a competitor is the better buy, because a comparison that says "we win every row" is not a comparison, it is a brochure.
Two things separate these tools once you look past the demo. Where the answer comes from: retrieved source documents, or the model's memory. And what leaves your environment: the full brief, or a version with the client stripped out. Almost every real-world failure traces back to one of those two.
| Legal Brain | Harvey | CoCounsel | Lexis+ with Protégé | ChatGPT / Claude | |
|---|---|---|---|---|---|
| Built specifically for Australian law | Yes Australian legislation and case law is the primary corpus | Partly Multi-jurisdiction, with Australian firms among its clients | Partly Multi-jurisdiction, Australian content via Thomson Reuters | Partly Multi-jurisdiction, Australian content via LexisNexis | No General purpose, no jurisdiction focus |
| Answers grounded in retrieved sources | Yes Retrieves first, then answers from what it found | Yes Retrieval over connected sources | Yes Retrieval over Westlaw content | Yes Retrieval over Lexis content | No Answers from training data. This is where fabricated citations come from |
| PII anonymised before the model sees it | Yes Client-identifying detail is stripped on the way in | Partly Enterprise data protections; anonymisation not published as a feature | Partly Enterprise data protections; anonymisation not published as a feature | Partly Enterprise data protections; anonymisation not published as a feature | No Whatever you paste is sent as-is |
| Requires a separate research subscription | No Standalone | No Standalone | Yes Sits on top of Westlaw | Yes Sits on top of Lexis+ | No Standalone, but not a legal research tool |
| Published pricing | Partly Early access, pricing on request | No Not published. Reported at roughly US$1,000 to $2,000 per seat per month for mid-market firms | Partly Reported at US$225 to $400+ per user per month, plus the Westlaw subscription underneath | Partly Quote-based. Australian entry packages reported from around A$160 per month | Yes Around US$20 to $30 per user per month |
| Realistic fit | Australian firms that need grounded answers without sending client detail offshore | Large firms running a whole-of-practice transformation with a budget to match | Litigation and research teams already committed to the Thomson Reuters stack | Firms already committed to the LexisNexis stack | General drafting and summarising on material that is not confidential |
How to read this
If you already pay for Westlaw or Lexis, start with CoCounsel or Lexis+ with Protégé. You are part-way to the bill already, and a second tool has to justify itself against something you are effectively getting at a discount.
If you are a large firm changing how the whole practice works, Harvey is built for that scale of programme, and is priced for it. Reported figures put it at roughly US$1,000 to $2,000 per seat per month for mid-market firms. It does not publish pricing, so get a quote rather than trusting any number, including this one.
If you are using ChatGPT or Claude for legal work, the problem is not quality of writing, it is that a general model answers from memory rather than from sources. That is the mechanism behind fabricated citations, and it is why courts are now ordering costs. See what Australian courts are doing about fabricated citations.
Where Legal Brain fits: Australian legislation and case law as the primary corpus, answers bound to the source they came from, and client-identifying detail stripped before the query leaves your environment. No research subscription required underneath. If you need multi-jurisdiction coverage across the US and UK, we are not the right tool and one of the others will serve you better.
Frequently asked questions
What is the best legal AI tool for Australian law firms?
It depends on what you already pay for. If you hold a Westlaw or Lexis subscription, the AI layer on top of it is the cheapest useful step. If you are running a firm-wide transformation with budget behind it, Harvey is built for that. If you want Australian law coverage with client detail anonymised before it reaches a model, and no research subscription underneath, that is the case for Legal Brain.
How much does Harvey AI cost?
Harvey does not publish pricing. Third-party reporting puts it at roughly US$1,000 to $2,000 per seat per month for mid-market firms, falling substantially at very large firm scale. Treat every published figure, including ours, as indicative only.
Is ChatGPT safe to use for legal work?
Not for confidential client material. It answers from training data rather than retrieved sources, and anything pasted into a consumer service has been disclosed to a third party. A US federal court has already found documents produced with a publicly available AI tool were not protected by attorney-client privilege or work product.
Sources
- Harvey, CoCounsel and Legora seat pricing (reported, not vendor-published)
- Legal AI pricing comparison: Harvey vs CoCounsel vs Clio
- Lexis+ with Protégé pricing signals and buyer questions
- Lexis+ AI, Australian listing and pricing
Competitor names and trade marks belong to their owners. Nothing here is an endorsement by them. Pricing that a vendor does not publish is shown as reported by the named third party and may be out of date or wrong; confirm directly with the vendor before making a buying decision.
See where Legal Brain lands for your firm
If one of the other tools is the better fit for how you work, we will tell you that.