RubyLLM is a streamlined Ruby API designed for interfacing with various AI models, including GPT, Claude, and Gemini, making it easier to build chatbots and AI applications without the hassle of managing multiple client libraries. It supports various functionalities such as image analysis, audio transcription, document extraction, and real-time response streaming, all while requiring minimal dependencies. Users can easily integrate this API into their applications by adding a simple gem and configuring their API keys.