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Generative AI is already changing how legal professionals work, but not all tools are created equal. A new independent study by of US large law firms has quantified the business benefits of Lexis+ AI. The findings are compelling, and highly relevant for lawyers in the UK, too.

So what did Forrester Consulting uncover, and how can UK firms expect to benefit?

Lexis+ AI gives lawyers time back

, a commissioned study conducted by Forrester Consulting on behalf of UU����ֱ�� in May 2025, found using Lexis+ AI gave lawyers a lot of time back, especially unbillable time, or time that gets written off. This can lead to increased profitability. Those time savings came from a combination of:

• Increased lawyer productivity
• Recovery of written-off time
• Time savings for support staff
• Improved client delivery and satisfaction

“The blue-sky firm goal is more about looking forward to the future and making sure the firm is investing in things that keep us current. And, so, I think that’s where [Lexis+ AI] falls.”
— Director of Research and Information, $3B global law firm

These findings echo broader trends across the profession. A 2023 study by the found that law firms are increasingly investing in AI to unlock long-term business value and enhance lawyer productivity.

1. Faster research and drafting for senior lawyers

Forrester found that senior associates and partners at US law firms saved up to 2.5 hours per week on routine drafting and legal research using Lexis+ AI. It also found they:

• Reached stronger first drafts faster
• Found relevant case law quicker
• Reduced the need for hand-offs to juniors.

“Generative AI features have reenergized interest in these products. Partners are getting more interested and they're coming to more training sessions than they did before. Very senior partners want to do research and learn the genAI tools.” — Information & Research Senior Manager, large law firm, $3B annual revenue

2. Junior lawyers recover billable time

Junior lawyers often write off research time that isn’t client-billable, especially when they’re ramping up on new topics. With Lexis+ AI, US firms were able to:

• Recover between 15% and 35% of written-off time 
• Enable junior associates to the heart of the matter faster and focus on more complex work.

“[Lexis+ AI] can do a pretty good job of doing what a first-year associate might do from a research perspective in giving [an attorney] a good starting point.”
— CIO, large law firm, $231B annual revenue

3. Significant time savings for knowledge and research teams

Lexis+ AI isn’t just for lawyers. Research staff at large US firms saved 225 hours per year each, streamlining workflows across:

• Complex legal research
• Case law retrieval
• Document summarisation.
  

Whether you're a PSL, librarian or knowledge manager, efficiency in supporting teams translates directly into more value for the firm and better service for lawyers.

4. Improved client service and satisfaction

Forrester highlighted that lawyers at US firms using Lexis+ AI could:

• Deliver work faster and with fewer errors
• Locate “needle-in-the-haystack” legal insights
• Improve the overall client experience.

These efficiency gains align with guidance from the , which in its 2023 Risk Outlook report encouraged law firms to explore the use of AI to free up capacity for higher-value work and better meet client needs. The study highlights AI’s potential to improve service delivery while maintaining professional standards, making it not just a tech upgrade, but a regulatory opportunity too.

“...With a better starting point, sometimes you find something that’s surfaced that you’ve missed. In that way, [Lexis+ AI] must enhance client service quite significantly by making sure there’s no point unturned.”
— Director of Knowledge for Research, large law firm, $3B annual revenue

UK clients increasingly expect high-quality work on tight deadlines, particularly in regulated sectors like finance, energy, and healthcare. Lexis+ AI helps lawyers meet those expectations while managing risk.

5. A safe, secure platform for sensitive legal work

Security concerns are front of mind for legal professionals experimenting with AI. Lexis+ AI is built within the UU����ֱ�� ecosystem, offering:

• Commercial-grade cloud security
• Encryption and siloed user sessions
• GDPR-aligned processing via EU data centres.

Unlike consumer AI tools, Lexis+ AI is designed for professional legal use. That makes it suitable for handling confidential, client-sensitive work without compromising compliance.

The described AI as an emerging competitive differentiator for law firms, not just in delivery speed, but in how well firms can integrate it into day-to-day client service. Forrester’s study supports this, noting improved client satisfaction as a core unquantified benefit of Lexis+ AI.

6. Attracting and retaining talent in a tech-first market

The study also found that Lexis+ AI:

• Supported associate career progression
• Contributed to better work/life balance
• Helped firms stand out in a competitive talent market.

“If attorneys can get to 40 hours sooner in the week, they can have more work/life balance.”
— Director of Research, large law firm, $100M+ annual revenue

With graduates entering practice having trained with AI tools, offering Lexis+ AI positions your firm as modern, forward-thinking, and supportive of innovation.

A strategic asset

We believe the Forrester study proves what early adopters already suspected: Lexis+ AI isn’t just a nice-to-have—it’s a strategic asset.

For UK law firms facing:

• Fixed-fee pressures
• Demands for faster delivery
• Rising operational costs
• The war for talent

...Lexis+ AI offers a secure, scalable way to boost performance and profitability without increasing headcount.