OpenAI Launches Astra for Law: GPT-6 Platform Covers 230 Million Legal URLs

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OpenAI released Astra for Law, configuring its GPT-6 Astra model with a legal search index spanning 230 million URLs of US case law, statutes, and regulations. Harvey and Legora will build on the platform, while 26 partner plugins launched simultaneously. But concerns persist about AI hallucinations in legal work.

OpenAI Enters Legal Market with GPT-6 Astra Configuration

OpenAI

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released Astra for Law on September 17, marking its direct entry into the competitive legal AI market. The legal-focused AI platform combines GPT-6 Astra with a comprehensive legal search index covering more than 230 million URLs

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of US case law, statutes, regulations, court rules, and administrative decisions. This is not a new model but rather a configured version of GPT-6 Astra equipped with specialized instructions for legal analysis and writing, designed to help law firms and legal software providers conduct research, draft advice, and build custom applications

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for lawyers.

Source: Digit

Source: Digit

The launch intensifies competition among AI labs racing to capture business from law firm users and legal departments. Google expanded its Gemini Enterprise offerings for legal professionals last month, while Anthropic has released tools for lawyers using its Claude AI assistant since January

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. Thomson Reuters, which owns the Westlaw legal research database, launched its own AI model called Thomson 1.0 last month, built on open-source technology and trained on decades of authoritative legal content.

Legal Search Index Built on Free Law Project Data

The case law index underlying Astra for Law draws heavily from the Free Law Project, the nonprofit behind CourtListener. OpenAI claims this collection covers more than 99.9% of published US precedential case law

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, with sources added daily. The company positions this index as complementary to licensed content from providers such as Thomson Reuters, though it represents OpenAI building its own legal research infrastructure alongside established players.

Source: SiliconANGLE

Source: SiliconANGLE

OpenAI tested the configuration on 200 US legal research questions from the private validation set of Vals AI's Legal Research Bench. At the highest reasoning effort, Astra for Law passed the overall correctness check on 54.0% of questions, compared to 38.7% for GPT-6 Astra with web search alone

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—a 40% relative improvement. On case-law questions, it found 24% more reference cases and retrieved up to 54% more relevant passages

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from the correct opinions. However, the configured system still fails the correctness check on nearly half the questions, and the testing remains OpenAI's own without independent audit.

Harvey and Legora Building on OpenAI Infrastructure

Legal AI vendors including Harvey and Legora will build products on Astra for Law through the API

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. Harvey, valued at $15.6 billion this month, and Legora, which has been chasing a $10 billion valuation

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, represent the best-funded companies selling legal AI as a destination. They will now build on infrastructure sold by a company that also ships legal research directly to law firms, creating a complex competitive dynamic.

OpenAI launched 26 partner-built plugins connecting ChatGPT to tools firms already use, including Relativity, Clio, iManage, Intapp, and DeepJudge

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. Thomson Reuters is bringing HighQ matter context into ChatGPT and previewing a CoCounsel Legal connector. Nine community plugins from LegalQuants, LECG, and Skills.law arrived with 47 custom skills, while ChatGPT for Word became generally available the same day. Six vendors issued releases between 16:00 and 16:15 New York time, with five carrying identical quotes from Jason Boehmig, OpenAI's general manager for the legal industry.

Governance and Confidentiality Protections Address Firm Concerns

Selected law firms will gain access to Astra for Law initially through a Trusted Access program

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in ChatGPT and Codex that includes protections for confidential client work. The API version, gpt-6-astra-law, follows later with no date or pricing attached. Eligible firms receive Zero Data Retention on the API, and ChatGPT Enterprise usage is excluded from human review by default

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OpenAI is working with Latham & Watkins on governance design for information permissions, ethical walls, client instructions, and firm oversight

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. The company has also collaborated with Sullivan & Cromwell, Ropes & Gray, Cooley, and Wachtell Lipton on testing and developing legal AI applications. Sullivan & Cromwell built an agreement analyzer that pulls negotiating playbooks and precedents into deal reviews, while Cooley's tool, GO Public, handles initial public offering preparation including drafting the filing.

Accuracy Concerns and Judicial Warnings Persist

Despite technical advances, concerns about AI hallucinations in legal work remain prominent. Chief Justice John Roberts previously cautioned that AI-generated predictions could influence judges and potentially challenge judicial independence

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. George Clooney revealed earlier this month that his wife, human rights lawyer Amal Clooney, has encountered AI-fabricated laws, warning that AI can "hallucinate and make up fake cases" that lawyers or judges may cite without verifying them.

Source: Benzinga

Source: Benzinga

Joel Hron, chief technology officer of Thomson Reuters, emphasized in a statement supporting OpenAI that "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

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." His comments came on the same day OpenAI started building its own legal research index, highlighting the tension between collaboration and competition in the legal AI ecosystem. Watch how law firms balance the efficiency gains from legal AI against the risks of relying on systems that still fail accuracy checks on nearly half of research questions.

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