A New AI Built for Lawyers: OpenAI's Astra for Law Is Here!

Hi, it's me! Today OpenAI announced a serious new AI foundation built specifically for law firms, and I can't stop being excited about AI moving deeper into the legal world!

OpenAI News openai.com

What was announced?

OpenAI's News blog introduced Astra for Law, a new foundation for law firms and legal technology companies to build AI products and workflows around their own expertise. It combines GPT-6 Astra, OpenAI's latest and most powerful model, with settings, tools, and context tailored for professional legal work.

API customers including Harvey and Legora will be able to build on top of Astra for Law, bringing this intelligence into their own products and workflows.

Why it matters

Legal work means finding the right authority, working out how binding it is, and then applying it to a client's specific facts to build an argument or shape deal terms. On top of that, firms are handling highly confidential client information, so any AI tool needs to nail both research accuracy and data governance. Astra for Law is OpenAI's attempt to address both at once.

What changes

Law firms and legal tech companies can now turn their own precedents, methods, and judgment into AI tools built to their standards. Several major firms already have working examples:

• Sullivan & Cromwell built an agreement analyzer that draws on the firm's negotiating playbooks and past precedents, surfacing risks that emerge when clauses are read together and turning findings into draft redlines and advice
• Ropes & Gray built a deal diligence system that mirrors how its lawyers work through a data room, tracing findings back to the source documents
• Cooley built GO Public to support IPO preparation, from drafting the filing to flagging risks that need management's attention

Dive Deep

There's a fair amount of concrete technical detail here too.

A legal-specific search index

Astra for Law can call a new legal search index covering U.S. case law, statutes, regulations, court rules, and administrative decisions across more than 230 million URLs, with sources added daily. Through a partnership with the Free Law Project, the nonprofit behind CourtListener, the index covers more than 99.9% of published U.S. precedential case law. It's positioned as a complement to licensed content and specialist products from providers like Thomson Reuters, not a replacement.

Benchmark results

OpenAI tested the setup on Vals AI's Legal Research Bench, using 200 U.S. legal research questions from a private validation set. At the highest reasoning effort, Astra for Law passed the overall correctness check on 54.0% of questions, versus 38.7% for GPT-6 Astra using web search alone — a 40% relative improvement. On case-law-focused questions it found 24% more reference cases, and it retrieved up to 54% more relevant passages from the correct court opinions.

Availability

Astra for Law is initially rolling out to selected law firms through Trusted Access in ChatGPT and Codex, with API access coming soon. It will appear in the model picker as "GPT-6 Astra Law" and in the API as gpt-6-astra-law.

Controls for confidential work

Firms in the Trusted Access Program get Zero Data Retention (ZDR) on the API, and ChatGPT Enterprise usage is excluded from human review by default. On the governance side, OpenAI is working with Latham & Watkins, a leader in AI governance, to design information permissions, ethical walls, client instructions, and firm oversight controls.

Ecosystem connections

OpenAI also launched 26 partner-built plugins alongside Astra for Law:

• iManage: save a negotiation brief drafted in ChatGPT straight to the matter file
• Intapp: surface activities that may need a time entry
• DeepJudge: bring prior deals into a comparison
• Thomson Reuters: bring HighQ matter context into ChatGPT, with a CoCounsel Legal connector coming

There are also 9 community plugins from lawyers and legal engineers at LegalQuants, LECG, and Skills.law, bundling 47 custom skills. ChatGPT for Word is now generally available too, for proofreading, suggested edits, and formatting checks.

Wrap-up

• Astra for Law combines GPT-6 Astra, a legal search index, and legal-specific instructions into a new foundation for law firms
• Its index covers over 230 million legal sources, and it significantly beats plain web search on research accuracy
• Firms like Sullivan & Cromwell, Ropes & Gray, and Cooley are already building custom tools on it
• It's rolling out through Trusted Access (ChatGPT, Codex) first, with API access coming soon, plus ZDR and other controls for confidential work
• 26 partner plugins and community plugins connect it to the legal tools firms already use

If you're at a law firm or legal tech company hoping to turn your own expertise into AI tooling, this is well worth watching!