This repository contains demonstration scripts and documentation for the GPT_API_free service, a forwarding proxy that provides free access to various large language models including GPT, DeepSeek, Claude, Gemini, and others. The actual forwarding server is not included; instead, the repository offers Python examples using the OpenAI library and standard HTTP requests to illustrate how to interact with the service's API endpoints for chat completions, image generation/editing, audio transcription, speech synthesis, and file analysis. The code is minimal and educational, focusing on replacing the base URL and authentication header to route requests through the proxy. The codebase is primarily a collection of usage examples tightly coupled to the external service's address and API key format. There is no production logic, no tests, and no independent reusable components. The demos follow standard patterns for calling OpenAI-compatible APIs and serve as a quick-start guide for developers integrating the service. As such, the repository does not represent a standalone application but rather a documentation supplement for the GPT_API_free project.