Alex Krentsel presents Exo, a self-improving AI agent architecture

UC Berkeley PhD candidate and Google Research senior researcher Alex Krentsel presented Exo at Arena HQ, according to a post from Arena.

Exo borrows the exokernel idea from operating systems, separating an agent into a protected mechanism layer (state, history, secrets, and a "guardian") and a fully evolvable policy layer.

Arena says Exo was 31-62% cheaper than Codex and Pi on open-world RuneScape tasks. The post does not give further details of the tests, and the figures come from Arena's own account.