gpt4free — Unified Free API for Multiple AI Providers

Introduction

gpt4free provides a unified Python client that routes requests to various LLM providers. It is designed for rapid prototyping and experimentation with different models through a consistent API surface, using an OpenAI-compatible interface.

What gpt4free Does

• Offers a single Python package to access multiple LLM providers
• Provides an OpenAI-compatible chat completions interface
• Supports text generation, image generation, and web search
• Includes a built-in GUI for interactive testing
• Handles provider rotation and fallback automatically

Architecture Overview

gpt4free is a pure Python library that implements an adapter layer on top of various LLM provider APIs. The client object mimics the OpenAI SDK interface, so existing code written for OpenAI can switch with minimal changes. Providers are loaded as plug-in modules, and the library selects an available one at runtime.

Self-Hosting & Configuration

• Install via pip: pip install g4f
• Run the GUI locally: g4f gui
• Set provider preferences in code or via environment variables
• Deploy as an API server with g4f api
• Docker image available for containerized setups

Key Features

• OpenAI-compatible SDK interface for drop-in replacement
• Supports dozens of model providers and hundreds of models
• Built-in web UI for interactive chat and image generation
• Async support for high-throughput applications
• Active community with frequent provider updates

Comparison with Similar Tools

• LiteLLM — production proxy with billing; gpt4free focuses on free-tier access
• OpenRouter — hosted routing service; gpt4free is self-contained and local
• Ollama — runs models locally on GPU; gpt4free routes to remote providers
• LangChain — full orchestration framework; gpt4free is a lightweight client only

FAQ

Q: Does gpt4free require API keys? A: For most providers it works without keys, though some providers may require authentication for higher limits.

Q: Is gpt4free production-ready? A: It is best suited for prototyping and experimentation. Provider availability can change without notice.

Q: Which models are supported? A: It supports GPT-4, GPT-4o, Claude, Gemini, Llama, and many more depending on available providers.

Q: Can I use it as a local API server? A: Yes, run g4f api to start an OpenAI-compatible server on localhost.

Sources

• https://github.com/xtekky/gpt4free
• https://g4f.ai