Claude Code Integration

Integrate 9Router with Claude Code CLI to route your Anthropic API requests through 9Router's intelligent routing system.

Prerequisites

Claude Code CLI installed
9Router running locally or cloud endpoint configured
API key from 9Router dashboard

Setup

1. Configure Environment Variables

Set the following environment variables in your shell configuration file (~/.bashrc, ~/.zshrc, or ~/.bash_profile):

# Base URL for 9Router
export ANTHROPIC_BASE_URL="http://localhost:20128/v1"

# Optional: Set default models for aliases
export ANTHROPIC_DEFAULT_OPUS_MODEL="cc/claude-opus-4-5-20251101"
export ANTHROPIC_DEFAULT_SONNET_MODEL="cc/claude-sonnet-4-5-20250929"
export ANTHROPIC_DEFAULT_HAIKU_MODEL="cc/claude-haiku-4-5-20251001"

2. Reload Shell Configuration

source ~/.zshrc  # or ~/.bashrc

3. Verify Configuration

Check that the environment variables are set correctly:

echo $ANTHROPIC_BASE_URL

Model Aliases

Claude Code supports the following model aliases that map to 9Router models:

Alias	Model	Environment Variable
`opus`	Claude Opus 4.5	`ANTHROPIC_DEFAULT_OPUS_MODEL`
`sonnet`	Claude Sonnet 4.5	`ANTHROPIC_DEFAULT_SONNET_MODEL`
`haiku`	Claude Haiku 4.5	`ANTHROPIC_DEFAULT_HAIKU_MODEL`

Usage Examples

Using Model Aliases

# Use Opus model
claude --model opus "Explain quantum computing"

# Use Sonnet model
claude --model sonnet "Write a Python function"

# Use Haiku model
claude --model haiku "Quick code review"

Using Full Model Names

claude --model cc/claude-opus-4-5-20251101 "Your prompt here"

Settings File

Claude Code stores its configuration in ~/.claude/settings.json. You can manually edit this file if needed:

{
  "baseUrl": "http://localhost:20128/v1",
  "defaultModel": "sonnet"
}

Troubleshooting

Connection Issues

If you encounter connection errors:

Verify 9Router is running: curl http://localhost:20128/health
Check environment variables are set correctly
Ensure no firewall is blocking port 20128

Model Not Found

If you get "model not found" errors:

Verify the model name matches your 9Router configuration
Check that the provider connection is active in 9Router dashboard
Ensure the model is available in your connected providers

Cloud Endpoint

To use 9Router cloud endpoint instead of localhost:

export ANTHROPIC_BASE_URL="https://9router.com"

Make sure you have configured your API key in the 9Router cloud dashboard.

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