Mar 10, 2026 | AI

Legal AI has moved beyond the stage where it can be considered an experiment.

We have watched AI transition from pilots and into the core of real legal work that is relied on, billed, filed, and defended. As this shift occurs, the AI conversation changes. It is no longer about curiosity or efficiency; it becomes about whether the system is truly dependable when the stakes are high.

That’s why the fact that more than one million professionals now use CoCounsel marks such an inflection point. This is not simply a vanity metric, but rather evidence that AI is being trusted with real workflows. Firms are no longer just testing solutions; they’re reshaping how work moves through their organizations, how expertise scales, and what clients experience as value. The gap between law firms that embrace that model and firms that don’t is already apparent, and it’s not going to close.

What’s becoming clear is that not all AI belongs in legal work.

The AI Line That Matters

Speed and fluency are easy to demo. They’re also the wrong bar. Legal professionals don’t operate in a world where “close enough” is acceptable. They operate in a world where answers have consequences for their clients, their firms, and the justice system itself.

General‑purpose AI is designed to sound plausible across almost anything. That’s impressive, but it’s also exactly the risk. In legal work, plausibility without grounding is a liability. Vertical AI startups focus on a specific domain, but are missing critical components including proprietary content depth, trusted workflows and enterprise-grade infrastructure.

This is where the difference between interesting AI and reliable AI shows up. At Thomson Reuters, we use the term fiduciary‑grade AI very intentionally. It means the system is built for environments where accuracy, accountability, and trust aren’t optional. Where sources matter. Where outputs need to be explainable. Where professionals have to stand behind the work. That’s the standard we built CoCounsel to meet. CoCounsel Legal is grounded in authoritative legal content refined over decades, not scraped public data. It draws directly from trusted sources like Westlaw and Practical Law, and it can connect to a law firm’s own knowledge and documents. Its outputs are transparent and citation‑backed because that’s what professionals need in order to rely on the result.

Equally important, the system itself is shaped and validated by domain experts who understand how legal work must be done, and what standards it must meet. Customer data is protected by design, not retrofitted through policy. Governance, accountability and oversight are built into the architecture.

CoCounsel Legal Reimagined: Built for How Legal Work Really Happens

The next generation of CoCounsel Legal reflects a simple belief: lawyers shouldn’t have to adapt themselves to AI.

For too long, legal AI has asked professionals to manage the system and choose solutions, craft prompts, stitch together workflows, and move work between platforms. That’s busywork. A lawyer’s value is not in learning how to operate software. It is in judgment, experience and strategy.

CoCounsel Legal removes that burden entirely.

With CoCounsel Legal, legal professionals describe what they need in plain language. The system determines how to get there by pulling the right sources, analyzing the relevant documents, applying jurisdiction‑specific guidance, and delivering work product that’s ready to be reviewed and used. Tasks that once took hours across multiple systems can now happen in a single workflow.

This is not an interface upgrade. It is a re-architecture of legal work execution.

“Lawyers don’t want to just operate software, and that’s not what great AI should do. CoCounsel keeps them in the analytical mindset they were trained for: going back and forth, challenging answers, and steering the work. With sourcing directly from Westlaw and Practical Law, they’re not wasting time second-guessing the results. We’re seeing adoption from associates to partners across every practice area. When it spreads that quickly, the experience just works.”

Andrew P. Medeiros
Managing Director of Innovation
Troutman Pepper Locke

Trust Is What Turns AI into Infrastructure

What we hear consistently from customers reflects that shift. They’re no longer asking whether to use AI. They’re asking which AI they’re willing to trust when the work actually matters.

Trust is what allows AI to move from the edges of practice into daily execution. It’s what enables law firms to embed AI into workflows that carry real legal, financial and reputational risk. And it is why one million professionals across more than 100 countries and territories now have access to CoCounsel.

That milestone isn’t the destination. It’s a signal that the profession is converging on a new operating model where AI becomes infrastructure, not novelty, and where advantage compounds for law firms that adopt dependable systems early.

The Future Is Already Taking Shape

The next chapter of legal work is not theoretical. It is already taking shape inside law firms that are using fiduciary-grade AI every day and moving faster, reducing friction and focusing more of their time on judgment rather than mechanics.

That’s the shift underway. And CoCounsel Legal is built for it.

Sign Up Now

The new CoCounsel Legal is entering beta in the United States soon, with general availability planned for later this year. More regions and territories will follow. 

Sign up now to join the waitlist for early beta access to the fully reimagined CoCounsel Legal experience. 

Fewer Steps. Bigger Outcomes. A fundamentally better way to practice law.