Claude Code Router (CCR)

Go proxy that routes Claude Code's Anthropic-format requests to OpenAI-compatible LLM providers.

Overview

CCR acts as a reverse proxy:

• Receives Anthropic API requests from Claude Code
• Converts to OpenAI format
• Forwards to provider (OpenRouter, Groq, LM Studio, etc.)
• Converts response back to Anthropic format

Install

go build -o ccr .

Usage

ccr start       # Start server
ccr stop        # Stop server
ccr status      # Show status
ccr restart     # Restart
ccr model       # List available models
ccr code        # Run Claude Code command via proxy
ccr activate    # Output shell env vars
ccr version     # Show version

Config

~/.claude-code-router/config.yaml:

port: 3457
host: "127.0.0.1"

Providers:
  - name: openrouter
    api_base_url: "https://openrouter.ai/api/v1"
    api_key: "${OPENROUTER_API_KEY}"
    models:
      - "anthropic/claude-3.5-sonnet"

Router:
  default: "openrouter,anthropic/claude-3.5-sonnet"
  think: "openrouter,anthropic/claude-3.5-sonnet"
  longContext: "openrouter,gpt-4o"
  longContextThreshold: 100000

Request Flow

1. Claude Code → CCR (Anthropic format)
2. CCR converts request to OpenAI format
3. Router selects provider/model based on rules
4. Provider forwards request
5. Response converted back to Anthropic format

Routing Rules (router/router.go)

1. Explicit provider,model in request
2. thinking.type == "enabled" → Router.Think
3. tokens > longContextThreshold → Router.LongContext
4. Default → Router.Default

Streaming

Provider SSE chunks → CCR converts to Anthropic SSE events:

• message_start, content_block_start, content_block_delta, content_block_stop
• message_delta, message_stop, ping
• Tool calls with input_json_delta

Build & Test

go build -o ccr .
go test ./...