Astra for Law

Astra for Law is an OpenAI offering that combines the GPT-6 Astra model with a legal search index, custom instructions for legal analysis and writing, and tools aimed at professional legal work. The index covers U.S. case law, statutes, regulations, court rules and administrative decisions across more than 230 million URLs, with sources added daily. It includes the Free Law Project's CourtListener case-law collection.

OpenAI reports that on 200 questions from the private validation set of Vals AI's Legal Research Bench, at the highest reasoning effort, Astra for Law passed the correctness check on 54.0% of questions, against 38.7% for GPT-6 Astra using web search alone. These are vendor-reported results. The offering also includes 26 ecosystem plugins connecting ChatGPT to tools such as Relativity and Clio, and OpenAI says it is working with Latham & Watkins on information permissions, ethical walls and firm oversight.

Access is initially limited to selected law firms through a Trusted Access Program in ChatGPT and Codex, with API availability described as coming soon. It appears in the model picker as "GPT-6 Astra Law" and in the API as gpt-6-astra-law. Harvey and Legora are named as API customers that will build on it. Eligible firms get Zero Data Retention on the API, and ChatGPT Enterprise usage is excluded from human review by default. The legal index is focused on U.S. law.