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Glowing holographic neural network shaped like an open law book hovering above a sleek black monolith with streams of case-law citations flowing into it
Future of Legal AI

OpenAI Launches GPT-Legal — First Foundation Model Trained Exclusively on Case Law, Aimed Squarely at Westlaw and Harvey

OpenAI used a Saturday-morning livestream to unveil <strong>GPT-Legal</strong> — the first general-purpose foundation model trained exclusively on US case law, statutes, and regulatory materials. The pricing undercuts Westlaw by 70%, the hallucination rate beats Harvey by half, and the timing — three days after the $9.4B Thomson Reuters–Harvey deal — was unmistakable.

May 17, 2026·12 min read