# Here's how Thomson Reuters is loosening Claude's costly grip

> **Open Intelligence Dossier** · First detected: 2026-08-25 00:07 UTC · Category: Business

## Executive Summary
Thomson Reuters has launched its own proprietary LLM, Thomson 1.0, to reduce reliance on Anthropic's costly AI infrastructure.

## Intelligence Brief
Thomson Reuters has officially launched a proprietary large language model named Thomson 1.0. According to coverage from LawSites and SiliconANGLE, this new AI model is specifically designed for legal work and was trained using specialized content from Westlaw and Practical Law. This development represents a strategic shift for the company as it integrates its own internal technology into its legal services ecosystem. CEO Steve Hasker has provided details regarding the model's implementation, signaling a move toward greater technical independence in the realm of generative artificial intelligence. Multiple outlets, including Business Insider and The New Stack, are focusing on the economic and operational motivations behind this launch.


Business Insider specifically highlights the goal of loosening the costly grip that Claude, an AI developed by Anthropic, has had on the company's operations. While Thomson Reuters has now introduced its own model, The New Stack notes that the company has continued to use Anthropic's technology even after training its own model. This indicates a hybrid approach where proprietary tools coexist with established third-party AI systems to maintain performance levels. The context for this move centers on the high cost and dependency associated with using external LLMs like Claude for massive datasets of legal information. By training Thomson 1.0 on its own proprietary legal datasets, such as Westlaw and Practical Law, Thomson Reuters aims to leverage its unique intellectual property.


The transition to a proprietary model allows the company to potentially lower operational expenses while tailoring the AI's outputs to the specific nuances of legal documentation and research, which differs from general-purpose AI training. Observers are now watching how Thomson Reuters balances the use of its own model against its ongoing relationship with Anthropic. The coverage indicates that the company is not abandoning Claude entirely but is instead diversifying its AI capabilities. Future updates will likely focus on how Thomson 1.0 performs in real-world legal applications compared to the external models it is intended to supplement or replace. The company's ability to scale this internal model while maintaining the accuracy required for legal work remains a key point of interest for the industry.

## Multi-Source Evidence Table
| Source Outlet | Headline | Verification URL |
|---|---|---|
| The New Stack | Thomson Reuters trained its own AI model. Then it kept using Anthropic’s anyway. | [Source Link](https://news.google.com/rss/articles/CBMiXEFVX3lxTE5RelNWYlpvSV9NY3ZFNV9QQ2R4ZmhZUnl2cmN5bVhmamY3S3VBaEdfM3g2WFdLLVRHZy1kalZuM2IwbWhub3Jqdy10S0JOWVgtMTNYUDd2WXNWVVhx?oc=5) |
| Artificial Lawyer | TR CEO Steve Hasker on Thomson 1.0 | [Source Link](https://news.google.com/rss/articles/CBMihgFBVV95cUxOSkZvcTNibjVHZGVwUE9MNnV0MnVZMjJuYVZ4Y3lhNnRfNXUwOVRlX2hHOUVwczFQOFplZmZQNjdmWERVN0lZUGM5OExERUJKbm1Hek1DdlhQdy1fTG1qclMyejhLX1hiR1VaNmI4S1ktWVF1aDQ5UnF0am83MURlQktTbEJvdw?oc=5) |
| LawSites | Thomson Reuters Launches Thomson, Its Own Proprietary LLM Trained on Westlaw and Practical Law Content | [Source Link](https://news.google.com/rss/articles/CBMi1AFBVV95cUxNWHZSa25SZExid0JFOW5nM1BpeUUxTmYxNF83Ym9OcVhsaklyMWQ4c24yLXVKRDNUUTRFeHp4NE9TSWVfV0RYb05OMUFUUDlCSkR0U2FuZ1NYUU13X3VLQ0lpYVVlSklHUHVQbWtabEVQUjJnaWViSW8wMG9ZZHFCd00yenhaN2k4NHR1Y2lRWnhyMUFEaFRwNjUwdTI4TUFpUWF0N1lxbUE3ZnJuYWpiTUkwTjB1WnJnaE5yTGkyb0tfajluSTRvaHlDSGZqZ3N3RFVaYQ?oc=5) |
| SiliconANGLE | Thomson Reuters launches proprietary AI model for legal work | [Source Link](https://news.google.com/rss/articles/CBMingFBVV95cUxNMmpwLUt2cU1XVnVacVFrd2F4QkZJc0Q0MjZOZjA4T3FCUGxBdGhYaVVRQ2gzT0VpWDFzU3dlREVFOEx4MG5wWUZrcDJHcGRHODdyYVR3TER5eVlQR3pRWVQ1LXItMm5qWWtram5HZHZGNXpiQ0ZJZmh1a0dXVVRNZE5TeHY0WGpOYVRFeE03MFNpOHZicHFiazZ2LUpfQQ?oc=5) |
| Business Insider | Here's how Thomson Reuters is loosening Claude's costly grip | [Source Link](https://news.google.com/rss/articles/CBMimAFBVV95cUxQNTlJeGxyakhWMlAyR0JTaEV6UDVnaTZmWVMxYk9SSk5wNktnU3gyVnZWdzRBek5CMjJsdExoWXBkNzJlQlZUQWVsbmVoTkcyQWZlX1p4ZUo1YUdkajlXUkw2TV83eTM1WFdsSUphQmU0eWo0dXExYjlKSXgwNlZzSzRRMDBOLWthMTNVbTFlU3JuTURNZ0tpWA?oc=5) |
| qz.com | Thomson Reuters launches in-house AI model to cut Anthropic costs | [Source Link](https://news.google.com/rss/articles/CBMib0FVX3lxTE92VFNObjUtUy1TSG9qdFE2QUZ2dVFQZ1BJU21ZaThMVTU3OEJxdkQ1LXNVbFNfaXc0S2o0RTh3djJnQThJc3dTUm5abWpma2tIVnZhdzBVbnMxMElDb2E0QTNtMEdaVHdDOFZmNWYzVQ?oc=5) |

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*Canonical Source: https://pulse.byoviral.com/trend/2026-08-25/here-s-how-thomson-reuters-is-loosening-claude-s-costly-grip*