The llmchess tool uses AI models GPT-3.5-turbo and GPT-4 to play chess. To use the tool, users must order and access the API key, then select the model and start a game as the white player. The game can be controlled with the “start” and “end” buttons, and a log appears on the right-hand pane of the tool. The tool was tested on Google Chrome and was created by Max Hager for game enthusiasts.