Open-Sora is an open-source project dedicated to efficiently generating high-quality videos, making its models, tools, and content accessible to everyone. By embracing open-source principles, Open-Sora not only democratizes access to advanced video generation technology but also provides a streamlined and user-friendly platform that simplifies the complexities of video production. Our goal is to foster innovation, creativity, and inclusive content creation through Open-Sora. Currently in its early stages, the project is actively under development. Open-Sora supports the entire video data preprocessing, accelerated training, and inference workflow. The provided weights can generate 2 seconds of 512x512 resolution video after only 3 days of training. Open-Sora has also achieved a 46% cost reduction through improved training strategies.