Hallo2 is a facial animation technology based on a latent diffusion generative model, generating high-resolution, long-duration videos driven by audio. It expands upon Hallo's capabilities by incorporating several design improvements, including the generation of long videos, 4K resolution outputs, and enhanced expression control through textual prompts. Key advantages of Hallo2 include high-resolution output, long-duration stability, and enhanced control via textual prompts, making it significantly beneficial for generating diverse and rich portrait animation content.