Haven is a robust platform designed to assist users in building, training, evaluating, and deploying Language Learning Models (LLMs). Its open-source nature and self-hostable platform make it widely accessible, adhering to the belief that AI technology should be available to all. Using Haven, users can build AI models that are tailored to handle specialized tasks, ensuring a high level of customization and relevance to various projects. It employs an Apache-2.0 licensed open-source platform, which provides a flexible and adaptable framework for constructing AI models. While the platform allows users to own their LLMs, it maintains a support system for assistance, providing comprehensive documentation and community engagement channels for facilitated seamless use. The platform also offers the option to self-host code. Haven, backed by Y Combinator, seeks to promote the democratization of AI technology through its interactive and accessible platform.