According to a recent LinkedIn post from Harvey, the company evaluated OpenAI’s newly released GPT-5.4 Mini model on its proprietary BigLaw Bench legal assessment suite. The post indicates that GPT-5.4 Mini achieved an 82.5% score overall, with especially strong results in deal management, risk assessment, and competitive performance in transactional drafting.
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The LinkedIn post suggests that GPT-5.4 Mini offers a favorable balance of speed, cost, and accuracy for high-volume, structured legal workflows such as compliance review, deal management, and data extraction. For investors, the benchmarking activity underscores Harvey’s focus on integrating or leveraging frontier AI models, which could enhance its product performance, improve unit economics through lower latency and cost, and potentially strengthen its competitive position in AI-enabled legal services.