On September 24, 2025, NVIDIA made a significant announcement: it was open-sourcing its generative AI facial animation model, Audio2Face. This open-source offering encompasses not just the model itself but also the software development kit (SDK) and a comprehensive training framework. In terms of functionality, this cutting-edge technology delves into the acoustic features of audio, like phonemes (the basic units of sound in a language) and intonation (the rise and fall of the voice). By analyzing these elements, it can drive the facial movements of virtual characters in real time. The result is incredibly precise lip-syncing, where the character's mouth movements perfectly match the spoken words, along with natural emotional expressions that bring the characters to life. Audio2Face operates in two distinct modes. Firstly, there's the offline rendering mode, which is ideal for pre-recorded audio. It allows for high-quality facial animation generation after the audio has been recorded. Secondly, the real-time streaming mode is designed for dynamic AI characters. This mode enables the characters to exhibit realistic facial expressions on the fly, responding instantly to the audio input. Due to these versatile features, Audio2Face has a broad range of applications. It can be a game-changer in the gaming industry, enhancing the realism of in-game characters. In the film and television production sector, it can streamline the process of creating lifelike animated characters. Moreover, in the customer service field, it can be used to develop virtual agents with more natural and engaging facial expressions, thereby improving the overall customer experience.