You can build a legitimate legal AI stack for under $100/month — Claude Pro ($20), ChatGPT Plus ($20), and Briefpoint ($89) cover research, drafting, and discovery. That's $129 total if you want all three, or just $20 if you start with Claude Pro alone. The days of needing a $50,000 enterprise contract to use AI in your practice are over.

Here's the reality: 90% of what expensive legal AI tools do, a well-prompted Claude Pro or ChatGPT Plus can handle for $20/month. The premium tools add compliance guardrails, verified citations, and firm-wide deployment — important for BigLaw, but overkill for most solos and small firms. The minimum viable AI stack is $20/month, and it'll transform your practice if you learn to use it properly.

Claude Pro is the single best $20 you can spend on legal AI. The 200K token context window means you can paste entire contracts, briefs, or deposition transcripts and get meaningful analysis. Claude's prose quality is the best of any AI model — your drafts read like a senior associate wrote them, not a machine. Use it for: drafting motions and briefs, analyzing contracts, summarizing depositions, writing client letters, legal research (with verification), and document comparison. The Team plan ($30/seat/month) adds the critical promise that your data won't be used for training — worth the extra $10 if you're handling any client information.

ChatGPT Plus ($20/Month): The Versatile Second Tool

ChatGPT Plus gives you GPT-4o with web browsing, file uploads, and custom GPTs. Where it beats Claude: web access for checking current regulations and recent case developments, data analysis on spreadsheets and financial documents, and the massive ecosystem of legal-specific custom GPTs other attorneys have built. Where it loses to Claude: writing quality, context window size, and nuanced legal analysis. The ideal setup is both — Claude for drafting and deep analysis, ChatGPT for research with web access and data crunching. Together they're $40/month.

Briefpoint ($89/Month): Discovery Automation That Pays for Itself

Briefpoint is the only specialized legal AI tool under $100/month that's genuinely worth the price. It automates discovery responses — interrogatories, requests for production, requests for admission — generating first drafts from the propounded discovery in minutes. If you handle litigation with any discovery volume, Briefpoint pays for itself on the first set of interrogatories. A set of responses that took a paralegal 4-6 hours now takes 30 minutes of review and editing. At $89/month, you need to save roughly 1-2 hours per month to break even, and most litigators save 10-20 hours.

Free Tools Worth Using: vLex, Google NotebookLM

vLex Vincent AI offers a free tier for legal research with AI-assisted case finding. It's not Westlaw, but for quick research questions and case discovery, it's surprisingly capable at zero cost. Google NotebookLM (free) lets you upload legal documents and creates an AI assistant that only answers from your sources — excellent for analyzing a set of case files or contract documents without hallucination risk. Casetext's free tier (limited) still provides basic case research. These free tools won't replace paid research platforms for serious work, but they're useful supplements.

What $100/Month Gets You vs. $1,000/Month Enterprise Tools

The honest comparison: $100/month stack (Claude Pro + ChatGPT Plus + free tools) gives you 80% of the capability at 10% of the cost. You get excellent drafting, solid research, document analysis, and general legal AI assistance. What you don't get: verified citations with source links (CoCounsel/Westlaw AI), firm-wide deployment with admin controls (Harvey), automated compliance checks (Spellbook), and the comfort of a legal-specific AI that won't hallucinate case law. For a solo or small firm doing $300K-1M in revenue, the $100/month stack is the right answer. The enterprise tools make sense at $2M+ when the risk calculus changes.

The Bottom Line: Claude Pro at $20/month is the minimum viable legal AI stack — add ChatGPT Plus and Briefpoint when your volume justifies it, and you've got 80% of what enterprise tools offer for under $130/month.

AI-Assisted Research. This piece was researched and written with AI assistance, reviewed and edited by Manu Ayala. For deeper takes and the perspective behind the research, follow me on LinkedIn or email me directly.