Fast, reliable A2UI, with swappable inference formats
A2UI now supports swappable inference formats, with A2UI Express as the new default that requires up to 3x fewer tokens than Direct JSON and can cut latency by up to 3x, while decision models like Jev can reduce latency by up to 80x for layouts defined in advance. Express is available in the Python agent SDK (a2ui-agent-sdk 0.9.0), the TypeScript agent SDK (@a2ui/agent) and the Dart SDK (a2ui_agent 0.0.1-wip004), and the SDK compiles the model's reply into validated A2UI messages. The post also describes the Apparite (jev2ui) example, where Jev answers layout questions and code builds the component tree, with screens complete in 0.8 to 1.7 s across 11 prompts in a small first-look sample.
Why it matters: It gives concrete latency and token figures plus working SDK versions for teams weighing Express against decision-model-driven layouts.