Google AI language model MUM now used by a billion people each month across Search, Google Assistant, and other services The latest major milestone comes as Google’s AI efforts continue to expand across all of its products and services. Google AI’s multimodal model, MUM, is now being used by more than a billion people each month across Google Search, Google Assistant and other products and services, the company announced Tuesday. Unveiled in May 2021, MUM, which stands for Multimodal Unification Model, is a large language model trained on text and code, as well as images, audio and video. It was announced with much fanfare as a next-generation AI model that would power new kinds of search experiences beyond simple keyword matching. At the time, Google AI said MUM was 1,000 times more powerful than BERT, the previous generation of its large language models, and that it could understand and generate human language with unprecedented accuracy. Since its launch, Google has gradually rolled out MUM across its products and services. For example, it’s used to power features like Search’s .