AI Contract Review: How to Use Claude for Due Diligence

Claude AI Can Review an Entire Contract in a Single Pass

Contract review is the legal task most transformed by AI. With Claude's 200,000-token context window, attorneys can upload an entire merger agreement, SaaS contract, or commercial lease and receive a structured risk analysis in minutes — work that previously consumed hours of associate time. Anthropic's Claude is uniquely suited to this task because it can hold an entire document set in memory without losing context or requiring you to break files into pieces.

What Types of Contracts Can Claude Review?

Claude handles virtually every contract type attorneys encounter in practice:

• M&A agreements: Asset purchase agreements, stock purchase agreements, merger agreements with complex rep and warranty sections
• Commercial contracts: SaaS agreements, MSAs, vendor contracts, licensing deals
• Real estate: Purchase and sale agreements, commercial leases, title documents (see our guide to Claude AI for real estate lawyers)
• Employment: Executive employment agreements, non-competes, severance packages
• Finance: Loan agreements, security agreements, intercreditor agreements

How to Structure a Contract Review Prompt

The key to effective AI contract review is using the CRAFT prompting framework. A generic "review this contract" prompt produces generic output. Instead, structure your prompt with these elements:

Example prompt: "Context: We represent the buyer in a $25M acquisition of a logistics company. Delaware law governs. Role: Act as a senior M&A attorney reviewing the seller's first draft APA. Ask: Identify every indemnification provision, survival period, and basket/cap structure. Flag any that deviate from market-standard terms for transactions of this size. Format: Table with columns for Section Number, Provision Summary, Market Standard Comparison, Risk Level, and Recommended Redline. Tone: Analytical, suitable for a partner review memo."

Building a Due Diligence Workflow with Claude

For full due diligence, attorneys can chain multiple Claude conversations into a complete workflow:

• Pass 1 — Risk identification: Upload the full agreement and request a risk matrix organized by severity.
• Pass 2 — Specific clause analysis: Drill into high-risk provisions identified in Pass 1 with targeted questions.
• Pass 3 — Redline generation: Ask Claude to draft alternative language for each flagged provision.
• Pass 4 — Comparison: Upload both the original and your client's standard terms, then ask Claude to produce a gap analysis.

What Claude Cannot Do in Contract Review

AI contract review has clear limitations that every attorney must understand:

• No legal advice: Claude identifies risks and drafts language, but the attorney makes all strategic decisions.
• No real-time data: Claude cannot check whether a specific regulatory requirement has changed since its training cutoff.
• No context beyond the document: Claude does not know about prior dealings, business relationships, or negotiation dynamics unless you provide them.
• Citation verification: If Claude references specific cases or regulations, verify them independently.

Confidentiality Considerations

Before uploading any client contract to Claude, ensure you are using a plan with appropriate data protections. Claude's Team and Enterprise plans offer zero data retention — your documents are never stored or used for training. This aligns with your obligations under the ABA ethics rules for AI use. For details on which plan is right for your firm, see our Claude pricing breakdown for lawyers.

Get the complete guide with contract review prompt templates for every major agreement type.