This isn't legal advice, just the operator's perspective I use to run AI tools in my own business in Germany. AI contract review with Claude, ChatGPT or Copilot works well as a first pass: the AI summarises the contract, finds clauses, deadlines and costs, and writes you a list of questions for your lawyer. It won't give you a binding answer on whether a clause holds up or whether to sign. It can miss or invent passages, and a contract is a confidential document full of personal data. If you review contracts for others, German law adds a hard limit: the Legal Services Act (Rechtsdienstleistungsgesetz, RDG). Other countries have their own rules on who may give legal advice, so check yours.
I'm a developer, not a lawyer. I work with AI daily; my fourteen AI employees run on Claude Team, some on open models or the API. One house rule matters even more with contracts: whoever produced something does not check it. More basics on AI at work are collected on my AI Basics page.
What AI can do with contracts
An AI reads twenty pages faster than you and doesn't tire. Five jobs where it takes real work off your plate:
- Summarising. What's it about, who owes what, how long does it run? How to summarise with a clear purpose is in Summarize Texts and PDFs with AI.
- Finding clauses. Termination, liability, warranty, penalties, jurisdiction, automatic renewal: the AI pulls out the passages and quotes them.
- Extracting deadlines and costs. Every date, deadline and amount apart from the main price, with its location in the contract, ready for your calendar.
- Comparing two versions. "What changed between draft 1 and draft 2?"
- Collecting questions. What's unclear, what's missing, what's unusual? That becomes your list for the conversation with your lawyer or the other side.
In all five, the result is a working list, not a legal opinion: it prepares you, it decides nothing.
AI contract review in five steps
- Prepare the contract. Black out or replace names, addresses, bank details and signatures wherever the AI doesn't need them. "Meier GmbH, 1 Sample Street" becomes "landlord". Check for a confidentiality clause first (more below).
- State your role and goal. The AI needs to know which side you're on and what you need the result for.
- Ask for verbatim quotes. For every statement, the passage from the contract, word for word, with section or page. And explicitly allow: "Not in the contract."
- Check every quote yourself. Open the contract and read each quoted passage. Whatever you can't find, you delete.
- Turn the rest into questions. Whatever stays open goes as a question to the other side or to your lawyer, not as an answer to yourself.
A prompt for steps 2 and 3 might look like this, as an example for a service agreement:
"I'm the client in this service agreement. List every obligation I have, every deadline with its date, every cost apart from the agreed fee, and every provision on termination, liability and renewal. Quote the relevant passage word for word for each point, with the section number. Answer only on the basis of this contract, not from your general knowledge. If the contract says nothing about a point, write: Not in the contract. At the end: ten questions I should ask a lawyer before I sign."
These building blocks come from Anthropic's guide to reducing hallucinations: allow "I don't know", quotes first, only the material provided.
An example of mine: a contract and the payments behind it
I always check data protection contracts such as data processing agreements with AI. But I've also reviewed property management contracts with Claude, along with bank statements, payments and rent increases. Bank statements aren't a contract. The example shows, though, what AI can do when it comes to a contract and the payments behind it.
The setup is nested: the account sits with the property management company, which also controls it. They deduct their fee there, transfer the base rent to a rental pool and pay out the rent including service charges to me. With one rent increase, the base rent and the rent including service charges were raised at the same time, and something went wrong: more money was transferred, but the base rent wasn't increased, only the rent including service charges was paid at the higher amount. The property management company didn't notice.
I didn't have the bank statements for months, then more than 100 pages arrived at once. Claude uncovered the error by analysing those statements. I would never have found it myself. It's more than 600 euros a year that I would have lost and that the tenant now has to pay in arrears.
What AI can't do with contracts
- Judge whether a clause is valid. That depends on statute, case law and your situation. An AI can write something plausible about it, but it isn't liable, and it often doesn't know recent rulings.
- Know your context. Verbal or side agreements, earlier emails, your history with the other party: what isn't in the chat, the AI doesn't know.
- Decide. Whether a risk is acceptable for you is a business decision. The AI can prepare it, not make it.
- Guarantee citations. If the AI names a statute or a ruling, check it against an official source. For German law, that's gesetze-im-internet.de.
The legal limit in Germany: the Legal Services Act
The German Legal Services Act (RDG) governs who may provide out-of-court legal services in Germany (section 1(1)). Section 2(1) defines a legal service, here in German with my translation:
„Rechtsdienstleistung ist jede Tätigkeit in konkreten fremden Angelegenheiten, sobald sie eine rechtliche Prüfung des Einzelfalls erfordert.“
(A legal service is any activity in specific matters of others as soon as it requires a legal examination of the individual case.)
Section 3 says when it's allowed: providing out-of-court legal services independently is not permitted unless it is allowed by one of the provisions it lists (sections 5, 6, 7, 8, 10 and 15) or "durch oder aufgrund eines anderen Gesetzes", by or under another statute.
My reading, not legal advice: reviewing your own contract with AI is your own matter, and the Act talks about matters of others. You remain fully responsible for what you sign. Reviewing contracts for clients, say as a consultant or agency, is different. That can be a legal service, and AI doesn't change it: the Act looks at the activity, not the tool. One of the exceptions in section 3 is section 5(1), legal services as an ancillary service that belongs to your professional profile. Whether that covers your case depends, under the same provision, on content, scope and connection to your main activity, taking into account the legal knowledge that main activity requires. If you want to offer this, ask a lawyer first. In my reading, general explanations like this article fall under section 2(3) no. 5, which exempts discussing legal questions for the general public in the media.
Hallucinations: when the AI invents a clause
With contracts, a hallucination is expensive: a notice period that actually reads differently, a liability cap that doesn't exist, a statute section that isn't real. Just as dangerous is a clause the AI simply overlooks. Anthropic says itself that the known techniques significantly reduce hallucinations but don't eliminate them: "Always validate critical information, especially for high-stakes decisions."
What helps: provide the material, allow "I don't know", ask for verbatim quotes, check every statement against the text. With very long contracts, the context window matters too, see Context and Context Windows in AI Explained. How to spot hallucinations in general is in AI Hallucinations: Why AI Makes Things Up. And my house rule counts double here: have the result checked in a second pass with its own instructions, not in the same chat.
Confidentiality and data protection
A contract almost always contains personal data: names, addresses, signatures, often bank details. Uploading it to an AI tool means handing that data to a service provider. Settle three questions first:
- Can the contract leave the house? Many contracts have a confidentiality clause or a separate non-disclosure agreement. Whether uploading to a cloud service falls under it depends on its wording. When in doubt, anonymise more or ask.
- Which plan? A free personal account is the wrong place for client contracts. Use a business plan with a data processing agreement and no training on your content. How I decide this in general is in AI and Privacy: What the AI Gets to See. If you work in Microsoft 365: what applies to Copilot is in Microsoft Copilot and GDPR at Work.
- What does the AI actually need? To find notice periods it doesn't need a name. Whatever isn't needed stays out.
For very sensitive contracts, a local model keeps the text on your machine, see Local AI and Privacy: Cloud or Server?
Frequently asked questions
Can I have my contracts reviewed by AI?
For your own contracts, the Legal Services Act shouldn't stand in the way in my reading, because it's about matters of others. This isn't legal advice. Mind confidentiality clauses and data protection: a business plan instead of a free account, names only where needed. Your signature stays your responsibility.
Does AI contract review replace a lawyer?
No. The AI prepares the summary, clauses, deadlines and questions. Whether a clause is valid and what to negotiate is for a lawyer who is liable for the answer. A good question list makes that time more effective.
Which AI is best for contract analysis?
There's no reliable ranking for your case. Have two tools review a contract you know well with the same prompt, and see which one misses or invents passages.
Can I review my clients' contracts with AI as a consultant?
Under German law, that can be a legal service under section 2(1) RDG, which section 3 RDG only allows where the Act or another statute permits it. AI doesn't change that. Whether an exception such as the ancillary service under section 5 RDG applies, clarify with a lawyer first.
Can AI draft contracts too?
It can write drafts, with the same limits as for reviewing: mistakes and invented statute references are possible, and a draft doesn't replace a legal review.
What to do next
Take a contract you need to renew or cancel soon, anonymise it and run the prompt above on a business plan. Check every quoted passage and turn the rest into your question list. Why I always have results checked in a separate pass is in Using Claude Well: Six Habits. How others use AI for contracts and paperwork in their business is what we discuss in my German-speaking community Claude Practitioners.
