Claude Code Proxy: Weekly Rate Limits? Resolved!

Route each Claude Code model tier to different providers! Use GLM for Haiku/Opus and keep Sonnet on your Claude subscription - all at the same time.

Why This Exists

Apparently I'm one of the "2%" of users that should encounter or be affected by Anthropic's new weekly limits. So I built this proxy to route certain models to LLM providers of your choice - welcome to the good ol days when we didn't need to worry about hitting our weekly limit. These models work with agents too!

Key Features

• ✨ 3 independent providers - Route Haiku, Opus, and Sonnet to different APIs simultaneously
• 🔄 Mix and match - GLM for speed/cost, Claude for premium
• 💰 Cost optimized - Route cheap tasks to alternatives, premium to Claude
• 🔐 OAuth preserved - Keep your Claude subscription active for Sonnet
• 🎯 Dead simple - Each tier configured with just 2 environment variables
• 🌐 Cross-platform - Works on macOS, Linux, and Windows

What It Does

Claude Code UI          Proxy Routes To
─────────────────       ───────────────────────────────
Haiku  (glm-4.6)        → GLM API
Opus   (glm-4.5-air)    → GLM API
Sonnet (claude-sonnet)  → Real Anthropic (OAuth)

How It Works

The proxy intercepts Claude Code's API requests:

1. You set: ANTHROPIC_BASE_URL=http://localhost:8082
2. Claude Code sends requests to: localhost:8082 instead of api.anthropic.com
3. Proxy checks model name:
   • glm-4.6 → Routes to GLM (HAIKU_PROVIDER_BASE_URL)
   • glm-4.5-air → Routes to GLM (OPUS_PROVIDER_BASE_URL)
   • claude-sonnet-4-5 → Routes to real Anthropic (OAuth passthrough)

Quick Start

macOS/Linux:

# 1. Install dependencies
pip install -r requirements.txt

# 2. Configure providers - Create .env file with:
cat > .env << 'EOF'
# Provider configurations
HAIKU_PROVIDER_API_KEY=sk-glm-xxx
HAIKU_PROVIDER_BASE_URL=https://api.z.ai/api/anthropic

OPUS_PROVIDER_API_KEY=sk-glm-xxx
OPUS_PROVIDER_BASE_URL=https://api.z.ai/api/anthropic

# Sonnet uses OAuth (leave commented)
# SONNET_PROVIDER_API_KEY=
# SONNET_PROVIDER_BASE_URL=

# Model name configuration
ANTHROPIC_DEFAULT_HAIKU_MODEL=glm-4.6
ANTHROPIC_DEFAULT_OPUS_MODEL=glm-4.5-air
EOF

# 3. Configure Claude Code (add to ~/.zshrc or ~/.bashrc)
export ANTHROPIC_DEFAULT_HAIKU_MODEL=glm-4.6
export ANTHROPIC_DEFAULT_OPUS_MODEL=glm-4.5-air
export ANTHROPIC_BASE_URL=http://localhost:8082  # ⚠️ CRITICAL

# 4. Start proxy & use Claude Code
python proxy.py &
claude

Windows (PowerShell):

# 1. Install dependencies
pip install -r requirements.txt

# 2. Configure providers - Create .env file with:
@"
# Provider configurations
HAIKU_PROVIDER_API_KEY=sk-glm-xxx
HAIKU_PROVIDER_BASE_URL=https://api.z.ai/api/anthropic

OPUS_PROVIDER_API_KEY=sk-glm-xxx
OPUS_PROVIDER_BASE_URL=https://api.z.ai/api/anthropic

# Sonnet uses OAuth (leave commented)
# SONNET_PROVIDER_API_KEY=
# SONNET_PROVIDER_BASE_URL=

# Model name configuration
ANTHROPIC_DEFAULT_HAIKU_MODEL=glm-4.6
ANTHROPIC_DEFAULT_OPUS_MODEL=glm-4.5-air
"@ | Out-File -FilePath .env -Encoding utf8

# 3. Configure Claude Code (add to PowerShell $PROFILE)
$env:ANTHROPIC_DEFAULT_HAIKU_MODEL = "glm-4.6"
$env:ANTHROPIC_DEFAULT_OPUS_MODEL = "glm-4.5-air"
$env:ANTHROPIC_BASE_URL = "http://localhost:8082"  # ⚠️ CRITICAL

# 4. Start proxy & use Claude Code
Start-Process python -ArgumentList "proxy.py" -WindowStyle Hidden
claude

What goes where:

• .env file → Provider configs + model name mappings (read by proxy)
• Shell env vars → Model names (ANTHROPIC_DEFAULT_*_MODEL) + base URL pointing to localhost:8082

Supported Providers

• GLM (via Z.AI) - Fast, cheap Chinese models
• Claude - Premium Anthropic models via OAuth
• Any Anthropic-compatible API - Works with any provider supporting /v1/messages

Use Cases

Haiku  → GLM (glm-4.6)      # $0.02/1M tokens
Opus   → GLM (glm-4.5-air)  # $0.01/1M tokens
Sonnet → Claude (real)      # Your subscription

Benefits

Benefit	Description
✅ Keep your Claude subscription	Uses OAuth, no API key needed
✅ 3 providers simultaneously	Different provider for each tier
✅ Native Claude Code support	Uses built-in environment variables
✅ Update-proof	No SDK modifications, survives updates
✅ Transparent	/model command shows actual routed model names
✅ Simple	Just environment variables, no complex config

Requirements

• Python 3.8+
• Claude Code installed globally
• Provider(s) with Anthropic-compatible API

Using with Agents

Agents automatically use your configured models:

---
name: my-agent
model: haiku  # Uses glm-4.6 (your ANTHROPIC_DEFAULT_HAIKU_MODEL)
---

API Endpoint Support

The proxy implements the following Anthropic API endpoints:

Endpoint	GLM Providers	Real Anthropic	Notes
POST /v1/messages	✅ Full support	✅ Full support	Main chat completion endpoint
POST /v1/messages/count_tokens	⚠️ Returns 501	✅ Full support	Token counting before sending. GLM doesn't support this - use token counts from message responses instead
GET /health	✅ Proxy health	✅ Proxy health	Proxy status endpoint (not forwarded to providers)

About Token Counting:

• Sonnet (Real Anthropic): Token counting works normally via /v1/messages/count_tokens
• Haiku/Opus (GLM): Token counting returns HTTP 501 with a helpful message. Token usage is still available in every /v1/messages response under the usage field.

Troubleshooting

Proxy not intercepting requests?

macOS/Linux:

echo $ANTHROPIC_BASE_URL  # Should output: http://localhost:8082
echo $ANTHROPIC_DEFAULT_HAIKU_MODEL  # Should output: glm-4.6
echo $ANTHROPIC_DEFAULT_OPUS_MODEL   # Should output: glm-4.5-air
# If empty, add to ~/.zshrc or ~/.bashrc:
# export ANTHROPIC_DEFAULT_HAIKU_MODEL=glm-4.6
# export ANTHROPIC_DEFAULT_OPUS_MODEL=glm-4.5-air
# export ANTHROPIC_BASE_URL=http://localhost:8082

Windows:

echo $env:ANTHROPIC_BASE_URL  # Should output: http://localhost:8082
echo $env:ANTHROPIC_DEFAULT_HAIKU_MODEL  # Should output: glm-4.6
echo $env:ANTHROPIC_DEFAULT_OPUS_MODEL   # Should output: glm-4.5-air
# If empty, add to PowerShell $PROFILE:
# $env:ANTHROPIC_DEFAULT_HAIKU_MODEL = "glm-4.6"
# $env:ANTHROPIC_DEFAULT_OPUS_MODEL = "glm-4.5-air"
# $env:ANTHROPIC_BASE_URL = "http://localhost:8082"

Check if proxy is running:

curl http://localhost:8082/health

Expected response:

{
  "status": "healthy",
  "haiku": {"model": "glm-4.6", "provider_set": true},
  "opus": {"model": "glm-4.5-air", "provider_set": true},
  "sonnet": {"uses_oauth": true}
}

Models not routing correctly?

• Verify model names in .env match ANTHROPIC_DEFAULT_*_MODEL vars
• Check proxy logs for routing info
• Test provider API keys directly with curl

Sonnet OAuth not working?

claude --login  # Refresh your Claude session

License

MIT

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