claudex

A CLI proxy to run Claude API requests (Anthropic-style) against OpenAI-compatible LLM providers (like OpenRouter), either for local development, automation, or as a bridge to OpenAI tooling.

Features

• FastAPI-based proxy for low-latency, robust relaying.
• Converts Anthropic Claude v3-style and Claude tool-calls API to OpenAI-compatible requests.
• Flexible environment variable configuration for provider settings.

Requirements

• Python 3.8+
• uvicorn for ASGI server
• FastAPI, httpx, python-dotenv, pydantic (see pyproject.toml)

Setup

git clone <your-repo-url>
cd claudex
python3 -m venv .venv
source .venv/bin/activate
pip install -e .
cp .env.example .env  # edit .env to fill in your API settings

Fill in your .env like:

TARGET_API_BASE=https://api.openrouter.ai/v1
TARGET_API_KEY=<your_provider_key>
BIG_MODEL_TARGET=openai/gpt-4.1
SMALL_MODEL_TARGET=openai/gpt-4.1-mini
LOG_LEVEL=INFO

Usage

After setup and installing dependencies, you can run the proxy in either of these ways:

1. Recommended: Run via the CLI/main entrypoint

# Run as module:
python -m claudex --host 0.0.0.0 --port 8082 --reload

# Or (if installed as a script):
claudex --host 0.0.0.0 --port 8082 --reload

2. Alternative: Run directly with Uvicorn

uvicorn claudex.proxy:app --host 0.0.0.0 --port 8082 --reload

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In a second terminal, you can now use the Claude CLI tool with this:

ANTHROPIC_BASE_URL=http://localhost:8082 DISABLE_PROMPT_CACHING=1 claude

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