FlagAI (Fast LArge-scale General AI models) is an extensible toolkit for downloading, training, fine-tuning, and deploying large-scale AI models. It supports over 30 mainstream models including language models like Aquila and WuDao GLM, vision-language models like AltCLIP and EVA-CLIP, and text-to-image models like AltDiffusion. The toolkit provides APIs for quick model downloads and supports both Chinese and English benchmarks including SuperGLUE and CLUE.