Paper Trail: September 19, 2026

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The Claude-Native Law Firm

Authors: Zack Shapiro
Link: post on X

Summary. A practitioner’s account of building a two-person boutique law firm around Anthropic’s Claude as its core operating layer. Shapiro describes using detailed prompts and custom Claude skills to encode his analytical frameworks, preferred formats, drafting voice, and judgement for tasks such as contract review, transaction support, drafting, and client communications. The article emphasises that AI generates and assists with first-pass work under lawyer supervision; legal judgement and final approval remain with the attorney.

Authors: Anthropic
Link: GitHub

Summary. An open-source benchmark built to evaluate and improve agent capabilities for supporting legal work. Each task consists of an instruction, a client matter containing relevant materials, and a requirement that the agent produce a work product for review, mirroring how work is assigned, performed, and reviewed at large law firms.

Astra for Law

Author: OpenAI
Link: OpenAI page

Summary. A legal AI foundation that combines GPT-6 Astra with legal-analysis and writing instructions, a legal search index, and integrations with specialist legal tools. The legal search index covers US case law, statutes, regulations, court rules, and administrative decisions. Astra for Law is designed for law firms and legal technology companies to build workflows around their own expertise, precedents, and governance requirements. It is initially available to selected law firms through Trusted Access in ChatGPT and Codex, with API availability planned subsequently.