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Thomson Reuters connects CoCounsel Legal to Claude

Thomson Reuters connected CoCounsel Legal, which draws on Westlaw and Practical Law content, to Claude through an MCP integration announced as Anthropic expanded its legal tools. Pricing and subscription terms were not disclosed.

NEW YORK, May 12, 2026 Thomson Reuters connected its CoCounsel Legal system to Anthropic's Claude on May 12, 2026, as Anthropic expanded Claude's tools for lawyers, LawSites reported.1

Terms of the deal

The connector brings citation-grounded legal work to Claude. Thomson Reuters says CoCounsel Legal draws on 1.9 billion Westlaw and Practical Law documents, 1.4 billion KeyCite validity signals and a citation ledger that traces sources.1 The next-generation CoCounsel Legal, built on the Claude Agent SDK, was in beta, with general availability planned for summer 2026.1

The article does not disclose pricing or subscription terms for Thomson Reuters.1

Background

The same day, Free Law Project made CourtListener, with court decisions, PACER data, citation networks and oral argument audio, available as an MCP connector. Basic access is free, and elevated access requires a membership or commercial arrangement.1 Thomson Reuters has said it uses models from several AI providers in CoCounsel, and has not been reported to license its Westlaw content for model training in the sources checked here.

What it means for data sellers

The model is licensed access to a premium, curated corpus inside another company's AI product. The seller remains the content and subscription owner. Rights language matters: sellers in this position should be clear about whether partners may retrieve, display or train on their content.

How the deal came together

  1. Anthropic expands legal tools. On May 12, 2026, Anthropic announced expanded Claude tools for lawyers with connectors to third-party legal platforms.
  2. CoCounsel Legal connector. Thomson Reuters connected CoCounsel Legal, which it says draws on 1.9 billion Westlaw and Practical Law documents.
  3. Free Law Project joins. Free Law Project's CourtListener launched a separate MCP connector the same day.
  4. Next generation in beta. The next-generation CoCounsel Legal, built on the Claude Agent SDK, was in beta, with general availability planned for summer 2026.

Takeaways for companies with data

  • A publisher can reach AI users through a connector while keeping its product and subscription model.
  • The companies gave a size claim (billions of documents) as the main selling point, which comes from Thomson Reuters itself.
  • Open and paid sources can sit side by side: a free provider launched the same day.

Sources

Every numbered reference above points to an entry here. Figures come from these pages as of the date shown at the top of the article. Where a source reports a number it got from unnamed people, the text says so.

  1. Two legal research providers launch MCP integrations with Claude (LawSites, May 2026)

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About the AI Data Deal Tracker

SellYourAIData tracks publicly reported sales and licenses of data to AI companies, with the price, terms and sources for each. Entries are checked against public reporting and updated as deals change. SellYourAIData was not involved in this deal. To ask what your company's data could sell for, get a free valuation. To report a deal, contact us.