How to Use Claude Code with Crazyrouter: Base URL Setup, Model Routing, and Cost Savings#
If you are already using Claude Code, switching to Crazyrouter takes about 2 minutes. You keep your existing workflow, gain access to more models, and typically reduce your API cost by 40-50%.
Why Switch Claude Code to Crazyrouter?#
| Feature | Anthropic Direct | Via Crazyrouter |
|---|---|---|
| Claude Code works | ✅ | ✅ |
| Pricing | Official rates | 40-50% lower |
| Models available | Claude only | Claude + GPT + Gemini + Grok + 300 more |
| Billing | Anthropic account | Unified, one invoice |
| Failover | None | Auto-failover between channels |
| Model switching | Manual code change | Change one parameter |
Setup: 3 Steps#
Step 1: Get a Crazyrouter API Key#
- Register at crazyrouter.com
- Go to Token Management
- Create a token — copy the
sk-key
Step 2: Set Environment Variables#
# Add to your shell profile (.bashrc, .zshrc, etc.)
export ANTHROPIC_BASE_URL=https://crazyrouter.com
export ANTHROPIC_API_KEY=sk-your-crazyrouter-key
Reload your shell:
source ~/.bashrc # or source ~/.zshrc
Step 3: Use Claude Code Normally#
claude
That's it. Claude Code will now route through Crazyrouter. Your prompts, context, and workflow stay exactly the same.
Verify It Works#
Run a quick test:
claude "What model are you and what is your base URL?"
You should see Claude respond normally. Check your Crazyrouter console logs to confirm requests are flowing through.
Advanced: Model Routing#
One of the biggest advantages of using Crazyrouter is model flexibility. You can switch between models without changing your integration.
Use Different Claude Versions#
# Default: Claude Sonnet (balanced)
export ANTHROPIC_MODEL=claude-sonnet-4-5-20250929
# For complex tasks: Claude Opus (strongest)
export ANTHROPIC_MODEL=claude-opus-4-6-20250918
# For simple tasks: Claude Haiku (fastest, cheapest)
export ANTHROPIC_MODEL=claude-haiku-4-5-20250929
Use Non-Claude Models via OpenAI Codex / Other Tools#
Since Crazyrouter supports OpenAI-compatible format too, you can also use:
# For OpenAI Codex CLI
export OPENAI_BASE_URL=https://crazyrouter.com/v1
export OPENAI_API_KEY=sk-your-crazyrouter-key
This means one Crazyrouter key powers both Claude Code and OpenAI Codex.
Cost Comparison#
For a typical developer using Claude Code moderately (about 500K tokens/day):
| Setup | Monthly Cost (est.) |
|---|---|
| Anthropic Max 5x subscription | $100/month (fixed) |
| Anthropic Max 20x subscription | $200/month (fixed) |
| Anthropic API direct | ~$60-80/month |
| Crazyrouter API | ~$30-45/month |
The savings come from Crazyrouter's lower per-token rates. For heavy users, the difference adds up fast.
Common Issues and Fixes#
| Issue | Solution |
|---|---|
ANTHROPIC_BASE_URL not recognized | Make sure you exported it and reloaded your shell |
| 401 Unauthorized | Check your API key is correct and has sufficient balance |
| Slow responses | Check status page; try a different model |
| Want to use both Claude and GPT | Set both ANTHROPIC_* and OPENAI_* env vars to Crazyrouter |
FAQ#
Does Claude Code work exactly the same through Crazyrouter?#
Yes. Same model, same capabilities, same context window. Crazyrouter proxies to the official Anthropic API.
Can I use Claude Code and OpenAI Codex with the same key?#
Yes. One Crazyrouter key works for both. Set the appropriate base URL for each tool.
Will my Claude Code settings and permissions carry over?#
Yes. Claude Code settings are local to your machine. Only the API routing changes.
Is there any latency difference?#
Minimal. Crazyrouter adds typically <50ms of routing overhead.
Can I switch back to Anthropic direct anytime?#
Yes. Just remove or change the ANTHROPIC_BASE_URL environment variable.
