Hertz-dev is a full-duplex, audio-only transformer foundational model open-sourced by Standard Intelligence, featuring 8.5 billion parameters. This model represents scalable cross-modal learning technology capable of converting mono 16kHz speech into an 8Hz latent representation at a bitrate of 1kbps, outperforming other audio encoders. Key advantages of hertz-dev include low latency, high efficiency, and accessibility for researchers to fine-tune and build upon. Contextual information indicates that Standard Intelligence is committed to developing general intelligence that benefits humanity, with hertz-dev being a substantial step in that direction.