Screenshots of the Harvey, Clio, Thomson Reuters and Spellbook official pages, taken October 25, 2026
I have worked in IT for about twenty years, and when a small office asks me about AI, I do not start with which tool is smartest. I start with where the data goes and who checks the output. That order matters even more for lawyers, who owe duties of confidentiality and honesty to clients and courts. This guide covers the tools law firms are being sold, the free options people search for, and the rules that decide whether using them is safe. It is general information, not legal advice.
Quick answer- Legal research AI that cites its sources, such as CoCounsel Legal (built on Westlaw content, according to Thomson Reuters) and Clio Work, is a safer starting point than a general chatbot, but you must still check every citation.
- Harvey and Spellbook are the other names vendors push at law firms. Harvey is a broader platform and Spellbook focuses on contracts. I found no public pricing for either on the pages I read.
- Free chatbots are fine for general learning, not for client facts. California's State Bar guidance says a lawyer must not put confidential client information into a generative AI tool that carries material confidentiality or security risks without informed client consent.
- A New York federal court fined two lawyers and their firm $5,000 in 2023 for filing fake cases that ChatGPT produced.
Jump to: Best AI | Free | Law students | Non lawyers | The rules | Who uses what | Claude or ChatGPT | Fake citations | Comparison | Final pick | FAQ
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Best AI for Law Firms
Image: Thomson Reuters (official page), screenshot taken October 25, 2026
Law firm AI falls into two groups. General chatbots answer anything but are not tied to legal sources. Legal AI products connect the model to legal content and tie answers to citations you can open. For research, that second group is the better fit, because the main risk in legal work is an invented or misread authority.
CoCounsel Legal from Thomson Reuters describes itself as AI that reasons from Westlaw content, Practical Law guidance and your firm's own documents, with every citation linked so attorneys can click through and check the work. That is the vendor's claim. Thomson Reuters lists separate plans for firms with fewer than 10 attorneys and more than 10 attorneys, and its plans page (dated September 14, 2026 in search results) shows three levels: CoCounsel Legal, Practical Law Dynamic Tool Set with CoCounsel Essentials, and CoCounsel Essentials.
Image: Thomson Reuters (official page), screenshot taken October 25, 2026
Image: Thomson Reuters (official page), screenshot taken October 25, 2026
Who should pick CoCounsel Legal Research and drafting firmsYou already pay for Westlaw or Practical Law, or you want answers tied to citations you can open. Skip it if you want a price you can see before a sales call, or if your work is mostly contracts and you want a narrower tool.
Clio Work is Clio's legal AI. Its pricing page says it can analyze documents, transcripts and recordings and surface facts, claims and risks with citations back to the source, draft summaries and timelines, and research over 1 billion legal documents from more than 100 countries, checked through Clio's citator. Clio says you can use it on its own by uploading documents, or connect it to Clio Manage to pull in matters. It also says a free trial is available and that firm data is not used to train external AI models. Those are Clio's statements, so read the terms before you rely on them. Pricing is on Clio's pricing page.
Image: Clio (official page), screenshot taken October 25, 2026
Image: Clio (official page), screenshot taken October 25, 2026
Image: Clio (official page), screenshot taken October 25, 2026
My take (20 years in IT): For a small office, the practical question is whether the tool sits inside software you already use. Fewer places for client data to live means fewer vendors to vet. If you already run your matters in one system, start by asking that vendor what its AI does with your files.
Harvey's homepage describes a platform with Agents, Vault (storing and bulk-analyzing documents) and Knowledge (research on legal, regulatory and tax questions), with separate paths for law firms and in-house teams. I found no public price on the pages I read, and I could not verify any claim beyond what the vendor says about itself.
Image: Harvey (official page), screenshot taken October 25, 2026
Image: Harvey (official page), screenshot taken October 25, 2026
Image: Harvey (official page), screenshot taken October 25, 2026
Spellbook is aimed at contract work. Its homepage lists features for reviewing and redlining contracts, drafting, comparing contracts to standards, asking questions, and encoding your own standards as playbooks, and it highlights a new Autonomous Contract Management product. The call to action on the homepage is Book a Demo.
Image: Spellbook (official page), screenshot taken October 25, 2026
Image: Spellbook (official page), screenshot taken October 25, 2026
Who should pick which Quick guideResearch-heavy litigation or advice work: CoCounsel Legal or Clio Work. Contract-heavy work: Spellbook. Larger legal teams that want a wider platform: Harvey. Skip all of them if you cannot yet describe how you will check the output, because none of them removes that job.
Free AI for Law Firms and Best Free AI for Lawyers
Free usually means one of two things: a free trial of a legal product, or a free plan of a general chatbot. Clio says Clio Work starts with a free trial. For the other vendors above, I did not see a free plan on the pages I read.
General chatbots such as ChatGPT and Claude are widely available, but I did not read their current data terms for this guide, so I will not make claims about them. The rule from the California State Bar is the useful part: reasonable efforts to protect client confidences take more than relying on marketing assurances. That can include reviewing terms of use, privacy policies or vendor documentation, and in some cases asking a qualified IT or cybersecurity expert.
Free AI for Law Students
Law students face a different risk: honesty rules at school. I did not find a single policy that applies to all law schools, so check your school's and each professor's AI policy before you use any tool on graded work. Use AI to quiz yourself, summarize public material you paste in, or explain a doctrine, and then check the answer against the case or statute itself. The fake-case story below shows what happens when that last step is skipped.
Best Legal AI for Non Lawyers
I found no neutral head-to-head test of legal AI for people without a law license, so I will not name a winner. What I can say from the sources is that none of these products replaces a lawyer, and the tools sold to law firms are built for professionals who will check the output. If you are not a lawyer, a sensible use is learning the vocabulary, organizing your documents and writing a clear list of questions for a real lawyer. Do not file anything in court that an AI wrote without having it checked, and do not paste sensitive personal details into a tool whose terms you have not read.
AI in Law and Legal Practice, What the Rules Say
Image: American Bar Association (official page), screenshot taken October 25, 2026
The American Bar Association's Formal Opinion 512, issued July 29, 2024, is its first formal opinion on generative AI. According to the ABA news release, it says lawyers using these tools must fully consider their duties, and points mainly to four model rules:
- Competence (Rule 1.1): lawyers should understand the benefits and risks of the technology they use.
- Confidentiality (Rule 1.6): client information stays confidential regardless of its source unless the client gives informed consent.
- Communication (Rule 1.4): lawyers must reasonably consult with clients about the means used to reach their goals.
- Fees (Rule 1.5): if a lawyer spends 15 minutes entering information into a tool to draft a pleading, that time and the time to review the draft can be billed, but in most cases the lawyer cannot bill the client for learning how to use the tool.
Image: American Bar Association (official page), screenshot taken October 25, 2026
The opinion also covers supervising staff and vendors, advancing only meritorious claims, and candor toward the court. It says lawyers must review AI output, including analysis and citations, before submitting it to a court, and notes problems that have already occurred, such as citations to nonexistent opinions.
Image: State Bar of California (official page), screenshot taken October 25, 2026
The State Bar of California's 2026 Practical Guidance replaces its 2023 version and, at the request of the California Supreme Court, addresses agentic AI, meaning systems that can start tasks and use other tools with less prompting. The guidance says professional judgment cannot be delegated to AI, that lawyers remain responsible for reviewing and approving all outputs, decisions, advice and filings, and that the greater the system's autonomy, the greater the oversight a lawyer needs. It also says confidentiality risks grow when an AI agent has ongoing access to email, document systems or client files, so lawyers should limit that access.
My take (20 years in IT): California and the ABA are two sources, not the whole picture. Rules differ by state and may differ by court. The IT version of that advice is simple: write down what each tool can access, who can turn it on, and where the logs are. Then ask your state bar and your malpractice insurer what they require.
Which AI Are Law Firms Using?
I did not find a survey I could read and cite, so I will not give percentages. What I can tell you is which products vendors market to law firms: Thomson Reuters CoCounsel Legal, Clio Work, Harvey and Spellbook, plus general chatbots that individual lawyers may use on their own. The risk for a firm is the second group, because a tool nobody approved is a tool nobody has checked. If you manage a firm, set a written list of approved tools.
Is Claude or ChatGPT Better for Lawyers?
I found no independent test comparing them for legal work, so I cannot call one better. The question that matters more is which plan you would use and what its terms say about using your inputs, keeping data, and giving administrators control. Compare the official pages of ChatGPT and Claude for the plan you would actually buy, and have your IT person read the terms. The California guidance says that is the kind of review lawyers should do. Whichever you pick, the output still needs a human check.
Fake Citations, the Mata v. Avianca Lesson
The best-known warning is Mata v. Avianca, a case in the Southern District of New York. In an opinion dated June 22, 2023, the court said there is nothing inherently improper about using a reliable AI tool for assistance, but that the rules put a gatekeeping duty on attorneys to make sure their filings are accurate. It found that the lawyers Peter LoDuca and Steven A. Schwartz and their firm, Levidow, Levidow & Oberman P.C., had submitted nonexistent judicial opinions with fake quotes and citations created by ChatGPT and then stood by them. The court found bad faith based on conscious avoidance and false and misleading statements, ordered letters to the judges whose names were falsely attached to the fake opinions, and imposed a $5,000 penalty, jointly and severally, paid into the court registry. You can read the full order.
My take (20 years in IT): The lesson is not that AI is banned. It is that a confident answer is not a source. Open every case the tool cites, read the passage, and confirm it says what the tool claims. If you cannot find it, do not file it.
Quick Comparison
| Tool | Best for | What I read | Watch out for | Link |
|---|
| CoCounsel Legal | Research, drafting, document analysis | Vendor says it is grounded in Westlaw and Practical Law with linked citations | Pricing goes through sales | Visit site |
| Clio Work | Document analysis, research, drafting | Vendor says it works on its own or with Clio Manage; free trial | Read the data terms yourself | Visit site |
| Harvey | Larger legal teams, broad platform | Agents, Vault and Knowledge on the homepage | No public price found | Visit site |
| Spellbook | Contract review and drafting | Review, draft, compare, ask, playbooks | Contract-focused, demo-led | Visit site |
How to Choose AI for a Law Firm
- Where does client data go? Read the terms, not the marketing page. California's guidance says marketing assurances are not enough.
- Can you check the answer? Prefer tools that link every claim to a source you can open.
- How much can it do on its own? The more autonomy, the more oversight California's guidance says you need.
- Who approves tools? Keep a short written list of what staff may use.
- Who will you tell? Ask what your state bar and your clients expect you to disclose.
Final Recommendation
- Research and drafting: try CoCounsel Legal or Clio Work, and judge them on how easily you can verify a citation.
- Contracts: ask for a demo of Spellbook using a sample contract with no client facts.
- Larger teams: look at Harvey, and get the terms in writing.
- Free: use the free trial of Clio Work or a chatbot for non-client tasks only.
- Always: read the ABA opinion and your own state's guidance.
Frequently Asked Questions
Is it ethical for lawyers to use AI?
The ABA says lawyers may use generative AI but must fully consider duties such as competence, confidentiality, communication, supervision, candor to the court and reasonable fees. Your state may add its own rules.
Can a lawyer paste client information into a free chatbot?
California State Bar guidance says a lawyer must not input confidential client information into a generative AI tool that may present material risks to confidentiality or security without informed client consent. Check your own state rules before doing it.
Can a firm bill clients for time spent using AI?
The ABA release says a lawyer can bill for time entering information and reviewing the draft, but in most circumstances cannot bill the client for learning how to use the tool. Fees must still be reasonable.
What happened in Mata v. Avianca?
Two lawyers and their firm filed fake cases generated by ChatGPT. On June 22, 2023, a federal court found bad faith and imposed a $5,000 penalty, among other sanctions.
Is there a free AI that is safe for law firms?
A free trial such as Clio Work lets you test a legal product, but safety depends on the terms and on what you put in. Keep client facts out of any tool until you have reviewed its data terms.
Try These Tools
These are links to the official pages. I have no affiliate relationship with these vendors.
Sources
All pages were read on October 25, 2026. Some vendor pages loaded only in part, so vendor statements above are attributed to the vendors. This guide is general information and not legal advice. Screenshots come from the official pages named in each caption and belong to their owners.
Last updated: October 25, 2026.
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