Harvey post-trained an open model with expert data, nearly doubling completed legal tasks

ccerrato147 · x · 2026-11-11

Legal AI firm Harvey already validated the specialized-model route: it post-trained an open model with expert data from Mercor and others, reporting nearly twice as many completed tasks on its held-out legal benchmark as the base model, without using customer data. The author argues that once a company's AI usage is large enough, training a specialized model pays for itself as the upfront bill spreads across many uses — so cheaper inference could actually grow Mercor's customer base.

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