anomalyco/opencode (formerly sst/opencode, 210k stars, MIT) splits the coding agent into a client layer and a server layer: the server exposes OpenAPI 3.1 plus an SDK generated from the spec, and the TUI is just one remote frontend of it, so a single session can be driven from a terminal, an IDE, GitHub Actions and ACP clients such as Zed. More than 75 providers plug in through the AI SDK and Models.dev, OpenCode Zen offers a curated gateway of models tested before listing, the 35+ built-in LSPs ship disabled with docs stating they are not always a net win, skills resolve from .opencode, .claude and .agents roots, and permissions are a three-state allow/ask/deny. It is the most engineering-first branch of open-source coding agents: interface before UI.
Shopify Reflex separates headless Core logic from native UI, exposes each ViewModel as typed state and actions, and runs one deterministic test suite against both iOS and Android.
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OpenAI keeps Git and rebuilds the server with Pando; Anthropic replaces the Git workflow with Scion. A detailed comparison of consistency, caching, migration, and fit.
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