Definely MCP is now available in ChatGPT

We’re proud to be a launch partner for OpenAI for Law. Bringing the same review and verification tools you know from our Word add-in to ChatGPT Enterprise.

When we launched the Definely MCP earlier this year, the goal was simple: put specialist contract review inside the AI environments lawyers already use.

Lawyers can now call Definely review tools for validating defined terms, running precedent search, structural review, proofreading, and compiling issues lists, from inside whichever Enterprise AI platform they've already built into their workflow.

Definely's review technology is used daily by the world's leading law firms and in-house teams, including A&O Shearman, Slaughter and May and DLA Piper, alongside IKEA and Samsung. Definely MCP brings that same technology into the Enterprise AI workflow.

Accountability

The pace of AI assisted drafting continues to accelerate. A junior associate can turn around a first draft in minutes. A partner can pressure-test ten variations of a clause before lunch. What hasn't changed, and won't change, is where accountability sits. With the lawyer, not the model or the firm's AI policy.

The gap between how fast lawyers can now draft and how carefully they can review is the one Definely is built to solve. Asking an AI to mark its own homework isn't a credible answer for clients, risk committees, or courts. Lawyers need an objective, structurally independent layer, wherever they happen to be working.

What is Definely

Definely builds a deterministic, structured map of a document, consistently identifying every defined term, cross-reference, and clause relationship, and turning them into structured objects so review starts from a verified foundation.

Lawyers can now call on Definely tools directly into their AI conversation:

Verify contract drafts independently. Definely reviews through a separate, deterministic structural model checking for risk. Any problematic clause mechanics or missing provisions that could impact a deal.
Compare the draft against authoritative sources. Definely reviews against your firm's precedents and prior contract versions and surfaces every deviation with a traceable link back to the source it departs from.
Proofread contracts. Definely proofreads the document structurally and gives the lawyer a list of issues to work through.
Generate an issues list. Definely turns the changes in a marked-up contract into a structured issues list with columns for item, counterparty position, and client response.

Secure and trusted

Definely MCP runs on the same infrastructure and access controls as the Definely Word add-in: AES-256 encryption at rest, TLS 1.2+ in transit, and each user authenticating with their own Definely credentials. ISO 27001, ISO 42001, SOC 2 Type 2, and our most recent penetration test findings are all available in Definely's Trust Center, which your security team can request access to at trust.definely.com

Built for wherever lawyers work next

As Enterprise AI adoption in legal continues to broaden, our approach remains the same: put verifiable, structured review wherever lawyers are drafting and negotiating, so speed and verification can keep pace with each other.

“We're proud to be partnering with OpenAI for Law to bring Definely to ChatGPT. It has always been our mission to meet lawyers where they work; we started in Microsoft Word and are now in Enterprise AI with the Definely MCP. Where generation was once the bottleneck, it has now shifted to review. This is why we continue to support our customers enabling structured, credible and auditable review in the tools they use every day.”
Nnamdi Emelifeonwu, CEO