Claude Code

Connect your toolsBeginner5 min

Run Claude Code through Zukko: no Anthropic login, no subscription, billed from your balance.

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

1
Install Claude Code
curl -fsSL https://claude.ai/install.sh | bash
Already installed if claude --version works. If claude.ai returns 403, install with npm.

Open the settings file

mkdir -p ~/.claude && touch ~/.claude/settings.json && open -e ~/.claude/settings.json

Paste the settings

Replace fetch_... with your key and save the file:

json

{
  "env": {
    "ANTHROPIC_BASE_URL": "https://api.zukko.pro",
    "ANTHROPIC_AUTH_TOKEN": "fetch_...",
    "ANTHROPIC_DEFAULT_OPUS_MODEL": "claude-opus-5-5",
    "ANTHROPIC_DEFAULT_SONNET_MODEL": "claude-sonnet-5",
    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "claude-haiku-5-5"
  }
}

4
Run it
Open a new terminal window:
bash
cd path/to/project claude
Type "Hi". If you get an answer, it works.

1Models

Slot in `/model`	Model	When
Opus	`claude-opus-5-5`	Hard tasks
Sonnet	`claude-sonnet-5`	Everyday work
Haiku	`claude-haiku-5-5`	Small background tasks

Switch slots with /model. To use another model, change the name in settings.json and restart claude. All models: Models and pricing.

2VS Code extension

Install the Claude Code extension from the Marketplace.
The ~/.claude/settings.json file from the steps above must exist — the extension reads the same file.
In VS Code settings, turn on Claude Code: Disable Login Prompt.
Ctrl/Cmd + Shift + P → Developer: Reload Window.

3If it doesn't work

What you see	What to do
Asks you to log in to Anthropic	The key goes in `ANTHROPIC_AUTH_TOKEN`, not `ANTHROPIC_API_KEY`. Check the commas in `settings.json`. Logged in to Anthropic before? Run `/logout`
401	Typo in the key or it was revoked — create a new one
402	Out of balance — top up, no restart needed
403 `email_unverified`	Verify your email in the dashboard
404 on every request	Remove `/v1`: the address is exactly `https://api.zukko.pro`
404 `model_not_found` or 503 `model_disabled`	Pick a model from the list
Windows: `claude` is not recognized	Close PowerShell and open it again

Other errors: Something went wrong: what to do.

Choose provider

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