Thomson Reuters Launches Proprietary AI Model Thomson

August 24, 2026
Thomson Reuters launched Thomson, its first proprietary large language model. The company said it spent $40 million to train the model from an open source foundation and will first deploy it in CoCounsel Legal.

Thomson Reuters announced in a press release the launch of Thomson, its first proprietary large language model, developed in house. The company said it spent $40 million on talent and compute to train the model from an open source foundation.

Thomson is fully owned and controlled by Thomson Reuters. The company said the model was trained using proprietary content from Westlaw, Practical Law, Checkpoint, and Reuters, with subject matter experts involved in training objectives and evaluations.

The first deployment is in Tabular Analysis within CoCounsel Legal for law firms and corporate legal departments. Thomson Reuters said it also plans to extend Thomson models across its legal and tax portfolio.

The company is making a small version of Thomson available as an open weight model on Hugging Face for academic and non commercial use.

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