Yi is a globally leading pre-trained model that has achieved SOTA international best performance indicators in multiple evaluations. It has a lightweight model size, surpassing large-scale open-source models, making it more friendly to the developer community. Suitable for individuals and research purposes, Yi boasts the ability to emerge as a large model, catering to diverse scenarios and satisfying the rigid needs of the open-source community. Yi's open-source model is completely open to academic research and simultaneously offers free commercial use application.