Thomson 1: The New $40M Legal AI Model | Thomson Reuters Joel Hron

Thomson Reuters is transforming into an AI-first technology company with the launch of "Thomson," a specialized model designed for legal, tax, and compliance professionals. By building upon an open-source foundation and augmenting it with proprietary data and expert human feedback, the company achieves high-performance results in domain-specific tasks while maintaining cost efficiency. This strategy prioritizes "model ownership," allowing the organization to capture and compound institutional knowledge into a proprietary asset rather than relying solely on third-party frontier models. The model, which excels in deep research and tabular analysis, is being integrated into the CoCounsel platform to automate complex workflows. By utilizing internal subject matter experts to refine training through reinforcement learning, Thomson Reuters ensures the model remains accurate and verifiable, effectively addressing the unique challenges of high-stakes professional environments.