Dia2 1B
Dia2 1B is the smaller public Dia2 model. It can begin producing speech while text is still arriving and can use audio prefixes for the speakers. Its documented output is English dialogue of up to two minutes.
Separate audio prefixes guide each speaker
The supplied command accepts prefix-speaker-1 and prefix-speaker-2 recordings. The script still uses [S1] and [S2] markers. This gives a dialogue system a way to preserve speaker context without requiring one fixed built-in voice.Dia2-1B model card
The smaller model uses a narrower decoder
The 1B configuration has a 1,024-wide decoder and 1,500 maximum context steps. These are internal model settings, not a published text-token allowance. The card's user-facing limit is two minutes of English speech.Dia2-1B model configurationDia2-1B model card
Streaming capability and a ready-made server are separate
The model card still lists a real-streaming TTS server and the Sori speech-to-speech engine as upcoming. Downloadable weights and generation examples are available; that wording does not establish that those additional serving components have shipped.Dia2-1B model card
Specifications & access
| Detail | Value and conditions |
|---|---|
| Access | Downloadable |
| Model identifiers | nari-labs/Dia2-1B |
| Published weight size | 1,076,244,736 parameters in safetensors metadata.Dia2-1B weight and publication metadata |
| Repository created | 15 November 2025.Dia2-1B weight and publication metadata |
| Architecture | 30 decoder layers with a 1,024-wide embedding, plus a three-layer depth transformer.Dia2-1B model configuration |
| License | Apache 2.0. Third-party assets, including Kyutai's Mimi codec, retain their own licenses.Dia2-1B model card |
Related models
- Dia 1.6B 0626
Nari Labs · Dia
The June 2025 Dia revision with documented Transformers integration, English dialogue generation and audio-conditioned voices.
Launch date not confirmedDownloadable The larger Dia2 streaming dialogue model, with a wider decoder, audio-prefix conditioning and word-timing output.
Launch date not confirmedDownloadable