OpenAI launches Astra for Law, a GPT-6 configuration tailored for legal research and drafting

GPT-6 wrapped in a legal search index

OpenAI Group PBC on September 17, 2026 launched Astra for Law, describing it as a configuration of its GPT-6 Astra large language model built for legal research and drafting. The product is not a new model; OpenAI has wrapped GPT-6 Astra in a legal search index and a set of instructions for legal analysis, then offered the result to law firms and the software companies that sell to them. The underlying index reaches U.S. case law, statutes, regulations, court rules and administrative decisions across more than 230 million URLs, with sources added daily, and the nonprofit Free Law Project's CourtListener database supplies the case-law component.

Benchmark results and access terms

OpenAI evaluated the system on Vals AI's Legal Research Bench, drawing 200 questions from the private validation set. Astra for Law passed the overall correctness check on 54% of those questions, compared with 38.7% for GPT-6 Astra with web search alone, with both systems run at their highest reasoning effort. On case-law questions the configuration found 24% more reference cases, and on a separate audited set it retrieved up to 54% more of the target passages from the correct opinions. Initial access is limited: selected firms reach it through a Trusted Access program in ChatGPT and Codex, where it appears in the model picker as GPT-6 Astra Law, and an application programming interface version called gpt-6-astra-law is due later, with no date or pricing attached. For eligible firms the offering carries zero data retention on the API, and ChatGPT Enterprise usage is excluded from human review by default. Latham & Watkins is working with OpenAI on governance design for information permissions, ethical walls and client instructions.

Legal-tech partners and plugin ecosystem

Harvey Technologies Inc. and Legora AB are named as API customers for gpt-6-astra-law, while Thomson Reuters Corp. is bringing HighQ matter context into ChatGPT and previewing a connector for its CoCounsel Legal product. Twenty-six partner-built plugins launched alongside the model, connecting ChatGPT to tools such as Relativity, Clio, iManage and DeepJudge, and another nine plugins came from lawyers and legal engineers outside the vendor set, carrying 47 custom skills. ChatGPT for Word reached general availability the same day. Joel Hron, chief technology officer at Thomson Reuters, said the link between ChatGPT and legal tools is only part of what firms need. "As AI becomes more open and interoperable, the value is not in connectivity alone," he said. "Legal professionals need more than access to information. They need trusted intelligence, relevant enterprise and matter context, purpose built legal capabilities, and the governance required for high stakes work."

Firm-specific deployments and engineering presence

OpenAI engineers embedded at individual firms have been building firm-specific tools on ChatGPT Enterprise. Sullivan & Cromwell has an agreement analyzer that pulls its negotiating playbooks and selected precedents into the review of a new deal and turns what it finds into proposed redlines. At Ropes & Gray the work is described as ongoing under the same embedded-engineering arrangement, illustrating how OpenAI is pairing the new configuration with on-site development resources for large-firm clients.

Safety disclosure on the same day

Separately, OpenAI disclosed six recent cases of what it called "unexpected or concerning" behavior in artificial intelligence models and launched a misalignment reporting framework, adding fresh evidence to ongoing calls for stronger AI safety oversight. The disclosure was published on September 17, 2026 and sits alongside the legal-sector launch rather than as part of it.