Understand this story
On October 27, 2026, Google launched a replaceable reasoning format for A2UI, with A2UI Express becoming the new default format. According to the Google Developers Blog, Express can reduce latency by up to 3x and reduce the tokens needed to generate comparable UI by up to 3x; when used with decision models such as Jev for layout decisions, the latency reduction can reach 80x. The format has landed in the Python agent SDK (a2ui-agent-sdk 0.9.0), the TypeScript SDK (@a2ui/agent), and the Dart SDK (a2ui_agent 0.0.1-wip004), and developers can switch formats with a single parameter when creating a generator. There are currently no reports of further developments.
AI-generated from public reports
Latest development · Report
Google A2UI Introduces Swappable Inference Formats, Express Cuts Latency by Up to 3xDevelopments
1 confirmed developments
Google launches replaceable reasoning format A2UI Express for A2UI
Source:Google Developers Blog
Reports and discussion timeline
Browse reports and discussion by time. Their evidence levels remain distinct.
Oct 27
Google Developers BlogFirst-party
Google A2UI Introduces Swappable Inference Formats, Express Cuts Latency by Up to 3x
Google A2UI adds swappable inference formats, among which A2UI Express, as the new default format, can reduce latency by up to 3x and cut the tokens needed to generate comparable UIs by up to 3x; when combined with decision models such as Jev for layout decisions, latency reductions can reach up to 80x. Express is now available in the Python agent SDK (a2ui-agent-sdk 0.9.0), the TypeScript SDK (@a2ui/agent), and the Dart SDK (a2ui_agent 0.0.1-wip004); developers can switch formats with a single parameter when creating a generator.