ChessGPT is a website that allows users to play chess against ChatGPT, a conversational AI language model created by OpenAI. Developed by atomic14, the plugin can be used in ChatGPT sessions for playing chess. However, atomic14 created the website to make it easier for anyone to play. Users can copy and paste the moves into a ChatGPT session or use an APIKey if they have API access. The game is entirely client-side, making it safe to use. The website uses GPT-3.5, an older version of OpenAI's language model, and the code for the plugin is available on Github. ChessGPT is a unique tool for AI enthusiasts exploring the intersection of gaming and AI.