Claude Code Fable 5 Configuration Guide

Installation Steps

1. Install Node.js

Visit the Node.js official website and download the LTS version (long-term support, more stable).

2. Install Claude Code

Open a terminal (macOS/Linux) or PowerShell (Windows) and install via npm:

npm install -g @anthropic-ai/claude-code

Get API Key

Go to the LLMoxy Console → Token Management → Create New API Key. In step 1 "Basic Info", select Claude Fable 5 Dedicated in the Token Group (instead of the default group) so the token can properly call the Fable 5 model. Fill in the remaining steps (model scope, budget and expiration, security) as needed. After completion, copy the generated key — the full key is displayed only once, please save it securely.

Configuration Steps

Claude Code connects to LLMoxy via two environment variables:

ANTHROPIC_BASE_URL — Fill in https://llmoxy.com (without /v1)
ANTHROPIC_AUTH_TOKEN — The LLMoxy API Key created in the previous step

macOS / Linux

{
echo ''
echo '# LLMoxy'
echo 'export ANTHROPIC_BASE_URL="https://llmoxy.com"'
echo 'export ANTHROPIC_AUTH_TOKEN="Your LLMoxy API Key"'
} >> ~/.zshrc   # Bash users change to ~/.bashrc

source ~/.zshrc  # or source ~/.bashrc

Not sure which Shell you are using? Run echo $SHELL, /bin/zsh corresponds to ~/.zshrc, /bin/bash corresponds to ~/.bashrc.

Windows (PowerShell)

[Environment]::SetEnvironmentVariable("ANTHROPIC_BASE_URL","https://llmoxy.com","User")
[Environment]::SetEnvironmentVariable("ANTHROPIC_AUTH_TOKEN","Your LLMoxy API Key","User")

After setting, close and reopen a new PowerShell window for it to take effect.

Remember to replace Your LLMoxy API Key with the real Key you copied from the console.

Launch and Use Fable 5

Enter your project directory and launch Claude Code:

claude

Enter /model, select or enter the model name:

claude-fable-5

Press Enter to confirm and start programming with Claude Fable 5.

Verification

echo "$ANTHROPIC_BASE_URL"   # macOS/Linux, should display https://llmoxy.com
echo $env:ANTHROPIC_BASE_URL # Windows PowerShell

If Claude Code can chat normally, it means you have successfully connected to LLMoxy.

Common Issues

Environment variables not taking effect: Confirm you have sourced the config file or reopened the terminal window.

claude command not found: Confirm node -v outputs the version normally, then restart the terminal.

npm install -g permission error: Do not use sudo npm install -g to force installation. We recommend using nvm to manage Node.js, or run npm config set prefix ~/.npm-global and add ~/.npm-global/bin to PATH.