The llm project by Simon Willison, available on GitHub, is a command-line tool designed to interact with large language models (LLMs) like OpenAI’s GPT models directly from the terminal. This tool simplifies working with LLMs by allowing users to send prompts and receive responses without needing to write custom API integration code. After configuring your API key for services like OpenAI, you can easily send commands such as llm 'Your prompt here' to interact with the model. The tool also supports multiple options, such as specifying the model, adjusting token limits, and storing results in JSON format for further use. It’s a powerful utility for developers who prefer interacting with LLMs through a streamlined, CLI-focused workflow.