Meet CoCounsel—the world's first AI legal assistant

CoCounsel, our new AI legal assistant powered by OpenAI, is here—and it will change the practice of law

Today we’re thrilled to announce CoCounsel, the world’s first AI legal assistant. Now, for the first time, lawyers can delegate substantive work to AI and trust the results.

Want to see CoCounsel in action? Join us for a special introduction to CoCounsel on Wednesday, March 15, at 10:30 AM Pacific/1:30 PM Eastern. 

As we shared in our official press release, we’ve been collaborating with OpenAI to build CoCounsel on their latest, most advanced large language model. It was a natural fit between our two teams. OpenAI, the world leader in generative AI, selected Casetext to create a product powered by its technology that was suitable for professional use by lawyers. Our experience leading legal tech since 2013 and applying large language models to the law for over five years made us an ideal choice. 

With OpenAI’s powerful technology as our foundation, we’ve developed the only AI legal assistant knowledgeable, reliable, and secure enough to support the practice of law.

CoCounsel offers skills to handle both routine and sophisticated legal tasks—legal research memo drafting, deposition preparation, document review, and 4 more skills at launch, with more already in development. Delegating this time-consuming work gives lawyers more of their most precious resource—hours in the day—to focus on the higher-value, human work, such as creating strategy and building client relationships, that cannot be done by machine. 

So how did we create this one-of-a-kind solution? What sets it apart from a generalized, publicly available AI? And how do we know it’s ready for release?

Access to reliable information

By now most everyone knows AI is particularly good at fabricating uncannily convincing responses known as “hallucinations.” Because an AI is only as good as the data it can access, we began building CoCounsel by integrating Parallel Search, the first legal search tool to leverage breakthrough technology known as transformer-based neural nets to allow users to immediately find on-point concepts, even when they’re written in a way that would be missed by traditional approaches to search. 

This integration enables CoCounsel to draw upon reliable data to produce answers with exceptional accuracy and speed, supported by linked citations, making it easy for lawyers to verify CoCounsel’s output.

Rigorous, repeated testing

Casetext established a trust and reliability program managed by a dedicated team of experienced litigation and transactional attorneys and some of the country’s most talented AI engineers—our Trust Team. Since October 2022, our Trust Team has spent nearly 4,000 hours training and fine-tuning CoCounsel’s output based on over 30,000 legal questions.

An intensive beta program 

Casetext then invited a deliberately varied group of clients to use and give feedback on CoCounsel: 400+ lawyers from 40 different firms and organizations—including multinational law firms, solo law offices, nonprofits, and Fortune 50 corporations.

Over the course of several months, lawyers and legal professionals from these organizations used CoCounsel more than 50,000 times in their day-to-day work. These beta customers—without whose painstaking and thorough participation CoCounsel would not be the product it is today—gave us feedback vital to fine-tuning CoCounsel, work that continues to this day.

We’re endlessly grateful to our beta team. They’ve contributed not just to the development of this first-of-its-kind product, but also to the beginning of what we think will be a staggering transformation of the legal profession.

The utmost data privacy and security

As lawyers ourselves, we’re vigilant about security. Without iron-clad measures to keep their and their clients’ information confidential, lawyers cannot do their work effectively. 

So we made sure CoCounsel only accesses OpenAI’s model through dedicated servers—a “private entrance”—and through an interface between our technologies (an API) that never stores any content our customers upload to or enter into CoCounsel. This means none of the information used in CoCounsel is sent back to “train” OpenAI’s model. And Casetext has a zero storage policy—we never store client data and follow the stringent, externally-validated data requirements.

The most important outcome of all? Increased access to justice

CoCounsel will almost certainly help lawyers do better work and enjoy their work more, as they focus on the things most say they wish they could prioritize, but simply don’t have the room for today. 

Ultimately we see this change in how lawyers spend their time leading to a new normal, in which the cost of legal services decreases while the value of those services increases. A more valuable, more affordable product means more of the people who can’t afford a lawyer today can—which is desperately needed in the United States, where more than 90% of the legal needs of low-income Americans go unmet

And this is just the beginning. CoCounsel will be a force-multiplier for people who represent underserved communities through pro bono and legal aid work. Every one of our nonprofit beta customers has told us, in one way or another, that CoCounsel is already helping them work through their backlog and serve more clients. Doing this at scale will mean increasing access to justice for everyone. 

We are so proud and grateful to be a part of getting us all one step closer to the day when everyone will have access to high quality representation—and by extension, to justice—that today is often completely out of reach.

Learn more about CoCounsel at