Google A2UI adds swappable inference formats, with Express cutting latency up to 3x

Google released swappable inference formats for A2UI, its agent-optimized protocol for generative UI, letting agents generate an intermediate format that SDK compilers turn into validated A2UI messages. The new default, A2UI Express, uses up to 3x fewer tokens than Direct JSON for the same UI and cuts latency up to 3x, and it ships in the Python (a2ui-agent-sdk 0.9.0), TypeScript (@a2ui/agent) and Dart SDKs. Google also showed decision models such as TypeSafe's Jev choosing among predefined layouts, which it says can reduce latency up to 80x; in the Apparite example, screens were complete in 0.8 to 1.7 s across 11 prompts.