OpenCode Union Alpha AI Free (WINDOWS)

OpenCode Union Alpha AI Free is the Windows OpenCode desktop with Union Alpha on OpenCode Zen and OpenRouter. Stealth coding model, 262k context, image in, tools.

What's new in v1.18.31 (September 16, 2026)

• Official OpenCode desktop v1.18.31 (September 14, 2026)
• Union Alpha free on OpenCode Zen and OpenRouter (stealth/union-alpha)
• 262,144 token context, 131,072 max output, image + tools
• ACP session restore; TUI shows remote config auth errors

How to use

1. Download v1.18.31.
2. Extract OpenCode-Union-Alpha-AI-Free.zip.
3. Run the OpenCode desktop.
4. Pick Union Alpha (Zen) or stealth/union-alpha on OpenRouter.
5. Open a repo. Chat.

Key Features

• Union Alpha free preview
• OpenCode Zen + OpenRouter
• 262k context
• Image input / tools / streaming
• Desktop, TUI, VS Code

FAQ

Who made Union Alpha? Stealth provider. OpenRouter routes it. Notes in files/notes/.

After the free week? Preview is about one week from Sep 16. Pricing after that is not public.

Weights? No Hugging Face dump. API / desktop only.

Requirements

Windows 10/11. Internet for Zen / OpenRouter.

License

MIT notes - Copyright (C) 2026 opencodeunionalpha