Allen & Overy Announces Legal AI Product - Harvey

The AI product will eventually become available to all A&O firms worldwide.

Allen & Overy Announces Legal AI Product - Harvey

Lawnext.com and The Financial Times report that Allen & Overy, one of the largest law firms in the world, announced its integration of an artificial intelligence (AI) product known as Harvey into its global practice. The product is set to be used by more than 3,500 lawyers across 43 offices worldwide. Harvey relies on GPT-3, the large natural language model by OpenAI. The goal is to enable lawyers to create legal documents or perform legal research with simple instructions. 

Other law firms are bound to follow into A&O's footsteps. Harvey's founders, Gabriel Pereyra and Winston Weinberg, formerly of DeepMind and O'Melveny & Myers, respectively, are working with other law firms getting ready to deploy Harvey. Although they are yet to mention names, some firms will be using it for particular practices, while others, like A&O, will be deploying it for the whole company.

Harvey was trialed by A&O last November, and the trial resulted in:

  •  ~3,500 lawyers inquiring from Harvey
  • ~40,000 queries for their day-to-day client work
  • 250 practice areas
  • 50 different languages across all A&O offices

Harvey's ability to work across diverse practice areas and in multiple languages has been described as "unprecedented efficiency and intelligence." It's almost a fourth of the firm's daily work and about 80% of the their monthly work. David Wakeling, A&O partner, and head of its Markets Innovation Group that spearheaded the Harvey trial, called it a "game-changer" in the legal industry.

Pereyra and Weinberg noted that Harvey would be rolled out on a firm-by-firm basis as the product requires fine-tuning for each firm. They develop specific systems for particular firms, so you will have the specific model for A&O, which becomes fine-tuned for the firm. There's also the possibility of specializing in it more, where you can get specific models for cases. That is, you can have a case where you can have a specific client matter or particular litigation, and the model is fine-tuned for that litigation or transaction.

Image: Screenshot of Allen & Overy Home Page, February 17, 2023

Customer Stories

See how leading enterprise in-house teams have scaled smarter with Legal.io's high-caliber flex talent.

More from Legal.io


AI in the Courtroom: Tool or Stand In

A veteran Supreme Court advocate tested whether generative AI could outperform his own oral argument, highlighting both the promise and limits of large language models in high stakes appellate practice.

Feb 11, 2026
Read More
USPTO Seeks Public Input on AI’s Role in Patentability Assessment
USPTO Seeks Public Input on AI’s Role in Patentability Assessment

USPTO official emphasizes the importance of AI not derailing the critical role IP plays in incentivizing human ingenuity and investment.

May 02, 2024
Read More
Licensing Authorities
Licensing Authorities

Guide to bar association licensing authorities in the United States and abroad.

Nov 02, 2017
Read More
Community Discussion: How has the shift to remote work models impacted your legal operations, and what strategies have you implemented to adapt?
Community Discussion: How has the shift to remote work models impacted your legal operations, and what strategies have you implemented to adapt?

Legal Operations professionals discuss what changes have occurred in their legal department since implementing a remote work model.

Dec 21, 2023
Read More
National Bar Exam Scores Fall to Historic Low in February 2025

The average score on the February 2025 Multistate Bar Exam hit a record low, driven by repeat test takers and California’s shift away from the national exam format.

Mar 29, 2025
Read More
Ready to hire?

Schedule a free consultation to discuss your hiring needs.

Free 15-min consultation
Legal.io Platform
5 star reviews
Hiring made smarter

Easy-to-use platform for hiring legal talent, managing spend, and optimizing your panel — plus an average savings of 50%.

Need Immediate Help?

Submit a hiring request and let our experts handle the entire process for you.