OpenCode

Connect your toolsIntermediate3 min

Run OpenCode on Claude models through Zukko, billed from your balance.

You need: OpenCode (install), a fetch_... key (create one) and a balance from $1 (top up).

Open the settings file

mkdir -p ~/.config/opencode && touch ~/.config/opencode/opencode.json && open -e ~/.config/opencode/opencode.json

For a single project only, use opencode.json in its root.

Paste the settings

Replace fetch_... with your key and save:

json

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "anthropic": {
      "options": {
        "baseURL": "https://api.zukko.pro/v1",
        "apiKey": "fetch_..."
      },
      "models": {
        "claude-opus-5-5": {},
        "claude-sonnet-5": {}
      }
    }
  }
}

3
Pick a model
Run opencode in your project folder, type /models → Anthropic → claude-sonnet-5. Type "Hi".

Add other Claude models to the models block — names are in the model list.

If it doesn't work

What you see	What to do
404 on every request	`baseURL` needs `/v1`: `https://api.zukko.pro/v1`
No Zukko models in `/models`	Check the file path and commas, restart `opencode`
404 `model_not_found`	Take the name from the model list
401	Typo in the key — create a new one
402	Top up
403 `email_unverified`	Verify your email in the dashboard

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