We present Genny, a live coding interface for interacting with generative models. By implementing a streamlined generative model API within a Web-based live coding environment, we explore possibilities for how generative models can support live coding. We describe the implementation of our interface components and the backend system for working with generative models, show several design patterns with template code, and describe use of a practical generation method for live coding performance. The system currently enables the generation of two-bar rhythm patterns using lightweight models that support near-instantaneous inference, which are able to suggest and display alternative rhythm patterns based on live coders’ own inputs. Finally, we discuss reflections on this implementation approach, its current limitations, and further possibilities.