DARPA is seeking innovative research proposals for its Quantum Benchmarking Initiative, which aims to enable revolutionary advances in the design and evaluation of utility-scale fault-tolerant quantum computers. The opportunity, referred to as QBI 2026, targets specific challenges in developing these systems, excluding work that offers only evolutionary improvements. Proposals must be submitted in response to specific, forthcoming QBIT topic calls, which will provide detailed research outlines and instructions; submissions made directly to this program announcement will not be considered.