Taobao has officially launched RecGPT, a self-developed large-scale recommendation model boasting billions of parameters, significantly upgrading its "Guess You Like" feature. Leveraging Taobao Xingchen LLM, RecGPT integrates users' historical behaviors and multimodal product data to deliver highly accurate personalized recommendations. Following this upgrade, user clicks have witnessed double-digit growth, with the number of items added to carts and average session duration increasing by over 5%. RecGPT further excels in anticipating users' potential needs, for instance, predicting a baby's age based on purchasing history of baby products to recommend age-appropriate items, along with providing tailored recommendation rationales to foster greater engagement. This milestone underscores the application of Taobao & Tmall Group's AIGR technology and represents a pivotal component within the broader AIGX technology ecosystem.