Stability AI, in collaboration with Arm and researchers from UC San Diego, has launched Stable Audio Open Small, a compact text-to-audio generation model with 341 million parameters. This model is designed to run efficiently on Arm CPUs, which power approximately 99% of smartphones, enabling users to generate sound effects directly on their mobile devices without the need for GPUs. The model can produce 11 seconds of audio in under 8 seconds, offering fast and royalty-free sound generation. The release also features a novel adversarial relativistic-contrastive (ARC) post-training technique that enhances the speed, diversity, and efficiency of text-to-audio generation across various devices. Stable Audio Open Small is free to use and supports quick fine-tuning, marking a significant advancement in mobile audio AI capabilities.