How to Install OpenCode for VS Code/Antigravity Terminal

AI agents can help coding, but OpenCode is a specific AI agent in terminal to work mainly with dirs and files, it can work with some code too. Here's how to install in VS Code/Antigravity (AntiG) IDEs:

• Backend: Install OpenCode CLI in terminal (eg. Pwsh)
  npm i -g opencode-ai
• Find the location of opencode command
  (get-command opencode).path
• Add path to opencode command (opencode.ps1)
  Add to PATH in System Properties
• Extension: Install OpenCode in VS Code/AntiG:
• Find the 'opencode' extension by SST to install
• Also install the 'OpenCode Beta' extension by SST
• Get Key: Authenticate OpenCode CLI
• Open opencode.ai/zen in browser to get key
• Run this command to set key
  opencode auth login
• Or type /connect later after run
• Run: Use either of these ways to start OpenCode
• Click OpenCode icon on top-right corner of IDE
• Or run 'opencode' command in terminal of IDE
• Choose Model: Type the following in OpenCode to choose model (Big Pickle is currently free, early 2026):
• /models

Notes: Some important and usage notes

• Run OpenCode by clicking icon better, it opens port for other tools
• OpenCode doesn't know editor context (eg. opened tabs) 'cause it's terminal-specific AI agent
• Light theme? none yet, type /themes and choose Nord, a bit lighter
• Edit opencode.json in %USERPROFILE%\.config\opencode
• Format: https://opencode.ai/docs/themes/#using-a-theme