Dia2

Where most TTS systems wait for a full sentence, Dia2 begins speaking after the first few words arrive. Nari Labs' successor to its viral Dia model is a streaming dialogue engine released as open 1B and 2B checkpoints on Hugging Face, generating conversational audio progressively so a voice agent can respond with near-zero perceived latency. The model conditions on prior audio context, which keeps voices consistent across turns and lets developers steer delivery with an audio prefix, and it sustains up to about two minutes of English speech per generation. Built on Kyutai's Mimi codec, it runs in bfloat16 on CUDA 12.8 or newer GPUs with a CPU fallback, and installation goes through the uv package manager from the GitHub repository. Code and weights are both Apache 2.0, so commercial voice products can embed it freely. Nari Labs is candid that this is research-grade software: output quality varies between generations unless you fine-tune or anchor it with audio conditioning, but for real-time dialogue it occupies ground few open models touch.