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Claude Max API Proxy

claude-max-api-proxy is a community tool that exposes your Claude Max/Pro subscription as a local OpenAI-compatible API endpoint. This lets you point WednesdayAI (and other OpenAI-compatible tools) at your subscription instead of an API key.
This is a community tool, not officially supported by Anthropic or WednesdayAI. Anthropic has previously blocked some subscription usage outside Claude Code. Review Anthropic’s current terms before relying on this path in production.

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How it works

WednesdayAI → claude-max-api-proxy → Claude Code CLI → Anthropic (via your subscription)
 (OpenAI format)    (converts format)                    (uses your login)
The proxy accepts OpenAI-format requests at http://localhost:3456/v1/chat/completions, converts them to Claude Code CLI commands, and returns responses in OpenAI format (streaming supported).

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Prerequisites

  • Node.js 20+
  • Claude Code CLI authenticated with a Claude Max or Pro subscription
  • claude-max-api-proxy npm package

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Quick setup

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1. Install the proxy

npm install -g claude-max-api-proxy

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2. Verify Claude CLI authentication

claude --version

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3. Start the proxy server

claude-max-api
# Runs at http://localhost:3456

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4. Test it

curl http://localhost:3456/health
curl http://localhost:3456/v1/models

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5. Configure WednesdayAI

Point WednesdayAI at the local proxy as a custom OpenAI-compatible endpoint: 
{
  env: {
    OPENAI_API_KEY: "not-needed",
    OPENAI_BASE_URL: "http://localhost:3456/v1",
  },
  agents: {
    defaults: {
      model: { primary: "openai/claude-opus-4" },
    },
  },
}

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Available models

Model IDMaps to
claude-opus-4Claude Opus 4
claude-sonnet-4Claude Sonnet 4
claude-haiku-4Claude Haiku 4

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Cost comparison

ApproachCostBest for
Anthropic APIPay per tokenProduction, high volume
Claude Max subscription + proxy$200/month flatPersonal use, development

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Auto-start on macOS

Create a LaunchAgent to run the proxy automatically: 
cat > ~/Library/LaunchAgents/com.claude-max-api.plist << 'EOF'
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>com.claude-max-api</string>
  <key>RunAtLoad</key>
  <true/>
  <key>KeepAlive</key>
  <true/>
  <key>ProgramArguments</key>
  <array>
    <string>/usr/local/bin/node</string>
    <string>/usr/local/lib/node_modules/claude-max-api-proxy/dist/server/standalone.js</string>
  </array>
  <key>EnvironmentVariables</key>
  <dict>
    <key>PATH</key>
    <string>/usr/local/bin:/opt/homebrew/bin:~/.local/bin:/usr/bin:/bin</string>
  </dict>
</dict>
</plist>
EOF

launchctl bootstrap gui/$(id -u) ~/Library/LaunchAgents/com.claude-max-api.plist