The company used an open-weight model as the base for its own model.
August 24, 2026
Information services vendor Thomson Reuters launched its own proprietary model on Monday, which it said it trained at less than half the cost of other frontier AI models. The release shows what is possible for SaaS vendors like Thomson Reuters that are looking to capitalize on the AI market.
Developed in-house, Thomson was built on the vendor’s proprietary content -- with a focus on legal information -- technology and domain expertise. The model starts with a base model called Snowdon, developed by the FAIR Lab at Imperial College London.
Thomson Reuters, based in Toronto, frames its model, Thomson, as comparable to the strongest frontier models on the market, including Claude Opus 4.8, GPT 5.5 and Gemini 3.1 Pro. The new model comes after SaaS vendors in the legal information services sector were shaken following Anthropic's release of Claude Cowork plugins in February.
