OpenCode

Config Path

Windows:

C:\Users\User\.config\opencode\opencode.jsonc

Linux / macOS:

~/.config/opencode/opencode.jsonc

Example Config

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "anthropic": {
      "options": {
        "baseURL": "https://api.llmsrelay.com",
        "apiKey": "sk-cs4-YOUR_KEY"
      }
    }
  }
}

Notes

• Use your API key from the dashboard
• OpenCode should point to the bare Anthropic-compatible host: https://api.llmsrelay.com (no /v1)
• Recommended model IDs are the same stable Claude IDs used everywhere else

Windows setup

1. Install OpenCode

OpenCode ships as a standalone binary or via npm. Easiest path on Windows:

npm install -g opencode-ai
opencode --version

Alternative: download opencode-windows-x64.exe from GitHub Releases and put it on your PATH.

2. Create the config folder

OpenCode reads %USERPROFILE%\.config\opencode\opencode.jsonc:

mkdir $env:USERPROFILE\.config\opencode -ErrorAction SilentlyContinue
notepad $env:USERPROFILE\.config\opencode\opencode.jsonc

Paste the example config from the section above.

3. Optional: env vars instead of JSON

If you prefer environment variables, set them once with setx:

setx ANTHROPIC_BASE_URL "https://api.llmsrelay.com"
setx ANTHROPIC_API_KEY "sk-cs4-YOUR_KEY"

4. WSL note

If you run OpenCode inside WSL, the config path becomes ~/.config/opencode/opencode.jsonc and Windows env vars do not propagate — re-export them in ~/.bashrc.

5. Troubleshooting

• "opencode" not recognized — open a new PowerShell, or add %APPDATA%\npm to PATH.
• JSONC parse error — Notepad may save the file as UTF-8 with BOM. Use VS Code or notepad++ and save as UTF-8 (no BOM).
• 404 on requests — verify baseURL is exactly https://api.llmsrelay.com and does not include /v1.
• SmartScreen warning on first launch — click "More info" → "Run anyway" once, Windows will remember the choice.