WeChat open-source multimodal embedding model WeMM-Embedding
On September 4, 2026, WeChat AI announced the open-source of the general multi-modal embedding model WeMM-Embedding. This model comes in three versions: 2B, 4B, and 9B, and is based on the Qwen3.5 architecture. The 9B version ranked first on the MMEB-v2 list with a score of 80.6, while the 2B version achieved a score of 77.9, surpassing the previous leading 8B open-source model. Currently, the model is deployed in core scenarios such as WeChat Video Accounts, live broadcasts, and official accounts, with an average daily call volume of over 1 billion times. It is used for retrieval, sorting, user modeling, and cross-domain understanding. Related papers, code, and models have been published on arXiv, GitHub, and Hugging Face.