---
license: other
license_name: nvidia-open-model-license
license_link: https://www.nvidia.com/en-us/agreements/enterprise-software/nvidia-open-model-license/
base_model: nvidia/diar_streaming_sortformer_4spk-v2.1
tags:
  - speaker-diarization
  - sortformer
  - onnx
  - streaming
---

# Ultra Sortformer 8-speaker (streaming) — ONNX export for TalkBar

ONNX export of the Ultra Sortformer 8-speaker streaming diarization model,
used by the TalkBar desktop app as its optional large-meeting (5–8 speaker)
live diarizer.

## Provenance

| Stage | Artifact | License |
| --- | --- | --- |
| Base model | [nvidia/diar_streaming_sortformer_4spk-v2.1](https://huggingface.co/nvidia/diar_streaming_sortformer_4spk-v2.1) | [NVIDIA Open Model License](https://www.nvidia.com/en-us/agreements/enterprise-software/nvidia-open-model-license/) |
| 8-speaker derivative | [mago-ai/ultra_diar_streaming_sortformer_8spk_v1](https://huggingface.co/mago-ai/ultra_diar_streaming_sortformer_8spk_v1) (`.nemo`) | labeled Apache-2.0 by its authors; the NVIDIA base terms flow through to derivatives |
| This repo | `diar_streaming_sortformer_8spk-v1.onnx` — format conversion (`.nemo` → ONNX) of the above, no weight changes beyond export | distributed under the NVIDIA Open Model License terms inherited from the base model |

TalkBar makes **no independent license claim** over these weights: they are
a derivative of NVIDIA's streaming Sortformer and are redistributed under
the NVIDIA Open Model License, with attribution to NVIDIA and to the
Ultra-Sortformer project. Consult the license link above before reuse.

## File

| File | Bytes | SHA-256 |
| --- | ---: | --- |
| `diar_streaming_sortformer_8spk-v1.onnx` | 492,246,192 | `f8dda3268c0a7009446b44edea789b25e4a01aae921c28da712050c74b75a252` |

The TalkBar app downloads this file at a pinned commit and verifies the
SHA-256 before installing.