Oumi, a platform open-source, streamlines the lifecycle of foundational models from data preparation to training and evaluation. It supports training and fine tuning models with parameters ranging from 10 millions to 405 billion using state-of the-art techniques like SFT, LoRA QLoRA and DPO. The platform supports text and multimodal models including architectures such as Llama DeepSeek Qwen and Phi. Oumi provides tools for data curation and synthesis, allowing users to efficiently generate and manage training datasets. It integrates with popular engines such as vLLM and SGLang for deployment, ensuring efficient serving of models. The platform provides comprehensive evaluation capabilities to assess model performance using standard benchmarks. Oumi is designed to be flexible and can run in a variety of environments, including local laptops, cloud infrastructures like AWS, Azure GCP, Lambda, etc.