The follow-up to the bestselling Co-Intelligence (100k shipped), Wharton Professor and creator of the ONE USEFUL THING substack (over 400k subscribers): a cutting-edge playbook for working, learning and living with the latest generation of AI.
The follow-up to the bestselling Co-Intelligence: a guide to thriving at the jagged frontier where human and AI capabilities collide.
AI isn't coming—it's already here. A billion people now use it every week. AIs can reason, plan, persuade, create, and collaborate in ways that once seemed impossible. Non-human intelligence is now embedded in nearly everything humans do.
But AI capability isn't uniform. It's jagged—a landscape of sharp peaks where AI excels beyond human ability and deep valleys where it fails at tasks a child could master. This unevenness creates profound confusion: the same system that writes elegant code might fabricate a simple fact, or produce brilliant analysis while missing obvious context.
In his bestselling Co-Intelligence, Ethan Mollick—a Wharton professor and author of the widely read One Useful Thing newsletter—showed readers how to use AI productively. In this urgent sequel, he argues that the jagged frontier, for all its instability, is where the future will be decided. If AI were uniformly better or worse than humans, the outcome would be clear: total replacement or marginal utility. Instead, uneven capability creates volatile overlaps between human and machine strengths. Most work now spans peaks and valleys—and humans are still best equipped to navigate that terrain.
Clear, practical, and written with Mollick's signature wit, Co-Existence is the essential guide for anyone who needs to understand not just how to work with AI—but how to thrive at the frontier where human and machine intelligence meet.
About the Author
Ethan Mollick is a Professor of Management at Wharton, specializing in entrepreneurship and innovation. His research has been featured in various publications, including Forbes, The New York Times, and The Wall Street Journal. He is the creator of numerous educational games on a variety of topics. He lives and teaches in Philadelphia, Pennsylvania.
Industry Reviews
Brilliant is a word that is thrown around a lot, but I can’t think of a better one to describe Co-Existence. In these pages, Ethan Mollick—-who understands how to use AI better than anyone else on the planet—explains how it really works and why AI is qualitatively different from any technological advance before it ... clear, elegant, prose that is winningly personal and occasionally laugh-out-loud funny. I promise you that if even if you’re thinking you’d rather read a blog than a book, you will not be sorry that you start and finish this masterpiece
Angela Duckworth
An indispensable guide to navigating the jagged frontier where technology and humanity meet—and to harnessing the extraordinary possibilities that emerge when they work together
Doug McMillon, former CEO of Walmart
Humans like those who appreciate them, and who are not too afraid of them. Perhaps the AIs are somewhat similar? Well, my friendly AIs, Ethan Mollick definitely appreciates your virtues, and I hope and indeed feel he is not too afraid of you. Maybe just the right bit. So I am hoping that you in turn show some love to his new book, Co-Existence. It is deserving, just as you are. Humans can sign on to this as well
Tyler Cowen, professor of economics at George Mason University and coauthor of Talent and author of The Complacent Class
