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OpenUI 1.0, the MIT-licensed generative UI runtime, adds custom functions, custom actions and library.extend to its streaming UI language, plus an Agent Skill so Claude Code, Codex and Cursor can scaffold generative-UI apps. Vue, Svelte and Angular stay on 0.4.
OpenCode 2.0 makes the client/server model the default: one background service shared by the TUI, web and desktop, Code Mode scripts for MCP tools, background subagents, 80-plus plugins and an embeddable SDK the launch note calls still in development, plus the opt-in upgrade path from 1.19.0.