This document provides a summary of the TIP event “Bridging the Gap: Frontier Technologies and the Diffusion Dilemma,” which took place on 18 June 2025 at the OECD headquarters in Paris. It opens with an introduction that provides the context and objectives of the event, followed by a section highlighting the key takeaways from the discussions, focusing on frontier technologies (FTs), diffusion challenges, and their policy implications. The next section outlines implications for the OECD’s TIP policy agenda. A comprehensive summary of the event sessions is then provided, covering strategic decision-making in advancing FTs, technology diffusion, regional capabilities and investment strategies, interactive policy practice sessions, and complementarities and trade-offs in the STI policy mix.