MeetKai’s Functionary is a language model that can dynamically invoke external functions and plugins based on JSON Schema definitions, similar to OpenAI GPT function calls. The model determines when and how to execute functions, whether in parallel or serially, and interprets their outputs to decide next steps. Multiple model versions have been released, including 70B and 8B variants with up to 128k context length, with the medium version ranked 2nd on the Berkeley Function-Calling Leaderboard.