CoCounsel Review (Thomson Reuters): AI Legal Assistant for Australian Law Firms

Verdict (TL;DR): CoCounsel is the most credible enterprise AI legal assistant available in Australia. It runs on Westlaw and Practical Law content, hosts data on Australian servers, and is actively used by local firms. Pricing is opaque and enterprise-targeted — it is not a tool for sole practitioners or small firms operating outside a Westlaw subscription. It does not replace qualified legal advice, and Australian professionals should treat outputs as a starting point for human review, not a finished work product.

Score: 17/25 — ⭐⭐⭐⭐ Very Good

Last reviewed: 26 June 2026 by Adam.

What CoCounsel is

CoCounsel is Thomson Reuters' AI legal assistant for law firms, in-house legal teams, and government legal professionals. It was acquired from Casetext in 2023 and rebuilt into Thomson Reuters' broader legal research ecosystem, sitting on top of Westlaw and Practical Law content.

The tool handles four broad tasks: legal research (grounded in Westlaw case law and statutory databases), document analysis (reviewing, summarising, comparing, and interrogating contracts and court documents), AI-assisted drafting (generating clause-level and full-document drafts from firm precedents or Practical Law templates), and litigation preparation (deposition prep, timeline generation, complaint analysis).

CoCounsel launched in Australia in early 2024. It is now sold and supported locally, with Australian data hosting and integrations with Westlaw Precision Australia and Practical Law Australia — both of which carry Australian case law and legislation.

What it costs in Australia

CoCounsel pricing in Australia is not published publicly. Thomson Reuters uses a quote-based model tied to firm size, practice area coverage, and contract term.

In the US market, publicly available pricing for a solo attorney on Westlaw Advantage with CoCounsel Essentials starts at approximately USD $639/user/month (~AUD $895/user/month at the current AUD/USD exchange rate of ~0.64, inclusive of GST considerations). (AU pricing differs; treat as indicative only.) Firms with more than 10 attorneys are quoted by a sales representative.

There are four plan tiers: - CoCounsel Essentials — document analysis, drafting, and agentic workflows only; no Westlaw content. - Westlaw Advantage with CoCounsel Essentials — adds Australian case law, legislation, and KeyCite citation checking. - Practical Law Dynamic Tool Set with CoCounsel Essentials — adds Practical Law practice notes, checklists, and template content across 20+ practice areas. - CoCounsel Legal — full access across all tiers.

Australian firms interested in pricing should contact Thomson Reuters AU directly (thomsonreuters.com.au).

For Australian buyers: pricing is in AUD, billed directly by Thomson Reuters Australia. GST applies. All contracts are through the Australian entity.

How it works in practice

CoCounsel operates as a conversational AI assistant within a dedicated web interface, inside Microsoft Word (via an add-in), and through integrations with Microsoft Teams, Outlook, SharePoint, and iManage. Australian firms using Westlaw Precision Australia will find it most useful — CoCounsel draws directly on that database to ground research responses in verified, citation-backed Australian law.

A typical workflow: upload a commercial lease, ask CoCounsel to identify unusual clauses, and receive a structured analysis with citations to relevant Australian case law. Or ask it to research a question under the Australian Consumer Law, and receive a sourced answer with KeyCite flags on the cases cited — so you can see if they have been overruled or criticised.

The agentic workflow system automates multi-step tasks. Ask it to review a deposition transcript and extract admissions, or to draft a contract amendment based on a term sheet. These tasks happen end-to-end, not in a single prompt.

What it does well

Australian law grounding. This is the material differentiator. CoCounsel connected to Westlaw Precision Australia means research responses are grounded in real Australian case law and legislation — not US law by default. The citations are verifiable and link back to primary source documents.

Data hosted in Australia. Thomson Reuters confirms that all customer prompts, content, and outputs are stored and processed in Australia. This matters for Privacy Act compliance and for firms with data sovereignty obligations. The company holds ISO/IEC 42001:2023 certification for AI management. Data is encrypted in transit (TLS 1.2) and at rest (AES-256). Customer data is not used to train AI models.

Practical Law Australia integration. For transactional lawyers, access to Practical Law Australia's practice notes, precedent documents, and checklists — AI-assisted — is a meaningful time saving. The "Search and Summarise Practical Law" feature compresses what would be hours of background reading.

Enterprise-grade security posture. Zero-retention API calls to LLM providers. Customer identity is never exposed to third parties. Retention periods are configurable at the organisation level.

Multi-document analysis. Tabular analysis across large sets of contracts is a standout feature — relevant for due diligence and bulk contract review work.

What it doesn't do well

No published pricing. Every competitor in this space at least hints at a price range. Thomson Reuters gives you a request-a-demo form. For legal technology buyers evaluating options, this friction is real.

US-centric origins show. While Australian law coverage is real and improving, the most advanced agentic features — Deep Research, Litigation Document Analyzer — were built and optimised for US federal and state law. Australian firms should test these features specifically for local law before committing.

Not accessible to sole practitioners or small firms operating outside a Westlaw subscription. If you are a sole practitioner or a small firm without a Westlaw relationship, CoCounsel Essentials could theoretically be purchased standalone, but the value proposition drops sharply without grounded legal content underneath it.

This tool does not replace qualified legal advice. CoCounsel is designed as a research and drafting aid for trained legal professionals. It produces outputs that require lawyer review. Non-lawyers using it without supervision face significant risk of misinterpreting legal analysis. Outputs should not be filed or relied upon without a qualified solicitor or barrister reviewing the work product.

Pricing opacity creates trust friction. For a tool positioned on trust and verified content, the absence of transparent pricing is a peculiar choice.

Australian fit

This is one of very few legal AI tools that takes Australian data residency seriously and backs it with contractual and technical controls. The Australian law content coverage is genuine, not aspirational. For those reasons it scores well on Australian fit — though the lack of pricing transparency and the enterprise-only positioning keep it from a perfect score.

Alternatives

If CoCounsel is outside your budget or firm size, consider:

• Harvey — enterprise AI for large law firms, US-built but expanding; less Australian law grounding than CoCounsel, similarly opaque pricing.
• Lexis+ AI (now Protégé) — the direct LexisNexis competitor; also grounded in Australian law databases; full AU data hosting for Legal AI mode.
• Josef — Australian-built legal automation platform; a better fit for document automation and workflow tools for smaller firms and in-house teams.

For broader context, see our Best AI Legal Tools for Australia roundup.

Bottom line

CoCounsel is the right call for mid-to-large Australian law firms already on Westlaw. It is the most credibly Australian-grounded AI legal assistant on the market — local data, local law, local support. The lack of transparent pricing and the enterprise-only entry point are genuine limitations, but for firms that qualify, it delivers real efficiency gains on research, drafting, and document analysis. Test it specifically against Australian legal queries before committing, and ensure your firm's retainer clearly documents that AI outputs require solicitor review before use.

This tool does not replace qualified legal advice.

Score

Australian Fit gate: AU Fit 3/5 — below the ≥4/5 threshold for Excellent or Top Pick.

Frequently asked questions

Does CoCounsel cover Australian law?

Yes. CoCounsel in Australia integrates with Westlaw Precision Australia (Australian case law and legislation) and Practical Law Australia. Research responses are grounded in Australian primary legal sources with verifiable citations — this is a genuine capability, not a marketing claim.

Is CoCounsel data stored in Australia?

Yes. Thomson Reuters confirms that all customer prompts, content, and outputs are stored and processed in Australia. The tool uses zero-retention API calls to third-party LLM providers, and customer data is not used to train AI models.

How much does CoCounsel cost in Australia?

Thomson Reuters does not publish AUD pricing publicly. Pricing is quote-based, tied to firm size, practice area coverage, and contract term. Australian firms should contact Thomson Reuters Australia for a tailored quote. In the US market, indicative pricing for a single-attorney Westlaw + CoCounsel plan starts around USD $639/month, but Australian pricing differs.

Sources

• Thomson Reuters CoCounsel AU product page: https://www.thomsonreuters.com.au/en-au/products/cocounsel.html (accessed 26 June 2026) — Wayback 15 April 2026
• CoCounsel Legal plans page: https://legal.thomsonreuters.com/en/products/cocounsel-legal/plans (accessed 26 June 2026) — Wayback 3 July 2026
• Thomson Reuters CoCounsel data residency FAQ (AU page): https://www.thomsonreuters.com.au/en-au/products/cocounsel.html#faq (accessed 26 June 2026) — Wayback 15 April 2026
• CoCounsel pricing configurator (US, indicative only): https://sales.legalsolutions.thomsonreuters.com/en-us/products/cocounsel-essentials/plans-pricing (accessed 26 June 2026) — Wayback 21 June 2026
• ISO/IEC 42001:2023 certification announcement: https://www.thomsonreuters.com/en-us/posts/innovation/cocounsel-achieves-iso-iec-420012023-certification-another-milestone-in-trusted-ai/ (accessed 26 June 2026) — Wayback 10 February 2026

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