Sullivan & Cromwell Unveils AI-Powered Agreement Analyzer with OpenAI
Sullivan & Cromwell launched Agreement Analyzer, an AI tool for agreement review built with OpenAI, on Sept 17, 2026.
Why it matters: Legal teams face growing pressure to review contracts faster and more accurately. This AI tool aims to reduce manual effort and speed negotiation by combining firm expertise with advanced language models.
- Sullivan & Cromwell announced Agreement Analyzer at the OpenAI for Law Summit on Sept 17, 2026, integrating AI with firm-specific precedents and playbooks (sullcrom.com).
- Agreement Analyzer uses OpenAI's ChatGPT Enterprise technology tailored for contract issue spotting, comment drafting, and negotiation support (chat.openai.com).
- OpenAI also launched Astra for Law featuring GPT-6 Astra, a Legal Search Index with 230 million U.S. legal URLs and 73 plugins for enhanced legal research (artificiallawyer.com).
- Agreement Analyzer was co-developed by S&C and OpenAI engineers to fit S&C’s workflow needs, marking a major law firm’s embedded AI implementation (sullcrom.com).
On September 17, 2026, Sullivan & Cromwell (S&C) launched Agreement Analyzer, an AI-powered tool designed to streamline legal agreement review. The announcement occurred during the OpenAI for Law Summit.
Agreement Analyzer uniquely combines S&C’s internal precedents and negotiating playbooks with OpenAI’s ChatGPT Enterprise, enabling attorneys to efficiently identify contract issues, draft comments, and facilitate negotiations. This integration reflects S&C’s effort to embed AI directly into core legal workflows, aiming to enhance accuracy and reduce manual review workload.
Development of Agreement Analyzer was a joint effort between S&C and OpenAI engineers, ensuring the AI tool aligns closely with the firm’s specific standards and practices. This collaboration illustrates a rare and significant example of a top law firm co-creating AI tools tailored to its legal operations (S&C announcement).
Simultaneously, OpenAI unveiled Astra for Law, a platform leveraging the GPT-6 Astra model. It incorporates a Legal Search Index indexing over 230 million URLs of U.S. case law, statutes, regulations, and administrative materials, alongside 73 plugins developed by partners and the community to enhance legal research and drafting tasks.
These launches demonstrate how AI advancements are increasingly merging with legal practice tools, offering corporate legal departments and law firms new ways to improve contract review speed, precision, and consistency. The integration of advanced language models with extensive firm expertise marks a potential shift toward more automated yet lawyer-guided workflows.
However, independent industry insights caution that successful adoption will require balancing AI assistance with lawyer judgment to maintain high-quality legal analysis. The S&C-OpenAI collaboration stands as a benchmark for integrating AI in complex legal review but highlights the importance of measured implementation to preserve client trust and risk management.
By the numbers:
- 230 million — URLs indexed by OpenAI's Legal Search Index in Astra for Law
- 73 — total plugins (26 partner-built, 47 community) available on Astra for Law
- September 17, 2026 — launch date of Agreement Analyzer and Astra for Law
Yes, but: While the tool aims to streamline contract review, industry experts emphasize that AI must complement—not replace—lawyer expertise to avoid risks of overreliance or missed nuances.
What's next: Legal teams will likely pilot and gradually adopt Agreement Analyzer, with broader market adoption depending on demonstrated efficiency gains and reliability; related AI legal tools are expected to evolve rapidly.