Windows-Copilot-API; Access GPT-4 and GPT-5 models without API keys or billing (github.com)

A new unofficial tool called Windows-Copilot-API allows developers to access GPT-4 and GPT-5 models through a Microsoft Copilot account without the need for API keys or a paid plan. This project essentially turns the free chat experience found on copilot.microsoft.com into an API that can be easily integrated with Python applications or run as an OpenAI-compatible local server. Once a user signs in via a browser, their session remains active, enabling straightforward chat interactions without needing constant authentication. This development is significant for the AI/ML community as it democratizes access to advanced language models, allowing users who may not have the resources for an OpenAI account to utilize similar capabilities. The API supports features like streaming and multi-turn conversations, working seamlessly on Windows, macOS, and Linux environments. However, users should be mindful of rate limits and usage guidelines, as the bridge is intended for personal use rather than high-throughput demands. This tool can be particularly beneficial in regions where access to anonymous Copilot is restricted, enhancing the flexibility and reach of AI technologies for developers and enthusiasts alike.