Marimo is an open-source, next-generation Python notebook designed to enhance data exploration, experimentation, and application development. It offers a reactive programming environment that ensures code, outputs, and program state remain consistent, addressing common issues found in traditional notebooks. Marimo's notebooks are stored as pure Python files, making them Git-friendly and easily executable as scripts or deployable as interactive web applications. Key Features and Functionality: - Reactive Execution Model: Automatically re-runs dependent cells when changes occur, eliminating hidden state and ensuring reproducibility. - Interactive Widgets: Incorporates UI elements like sliders, text boxes, and interactive plots that synchronize seamlessly with Python code, enhancing data visualization and user interaction. - AI Integration: Supports AI-powered features such as intelligent code autocompletion, error auto-fixing, and integrated chat interfaces, with compatibility for models from OpenAI, Anthropic, Google Gemini, and local models. - SQL Integration: Allows execution of SQL queries directly within notebooks, supporting databases like DuckDB, PostgreSQL, MySQL, and SQLite, facilitating seamless data analysis. - Deployability: Notebooks can be deployed as interactive web applications, run as scripts, or executed in browsers via WebAssembly (WASM), providing flexibility in sharing and deploying work. Primary Value and User Solutions: Marimo addresses the limitations of traditional Python notebooks by offering a reproducible, interactive, and shareable programming environment. Its reactive execution model ensures consistency and eliminates hidden state, enhancing reliability in data analysis and experimentation. The integration of interactive widgets and AI-powered features streamlines the development of data applications, reducing the need for separate front-end development. By storing notebooks as pure Python files, Marimo facilitates version control and collaboration, making it an ideal tool for data scientists, AI engineers, and educators seeking a robust and flexible platform for their workflows.