CoArena is a live arena where anyone can use the world's top computer-use models racing two of them on the same real computer task and judging which one did it better. Every battle becomes something the AI labs can't build themselves, an honest test of their agents on real work, and the data to make them better. The company was founded by Prateek Jannu; Nitish Kovuru.
It is part of YC Summer 2026. It is based in San Francisco, CA, USA.