May 13, 2026

Deepgram is rolling out v2 of our batch speaker diarization model. v2 is a new architecture available today on an opt-in basis through the new diarize_model parameter. In side-by-side human evaluation, v2 was preferred 3.3× over our current production diarizer (v1), with the largest gains on contact-center audio — median CER reduced roughly 80% compared to the prior version of the diarization model. Customers using diarize=true are unaffected.

Key Features:

• New diarize_model parameter — A single parameter that both enables diarization and selects the version. Most customers should choose latest; v2 or v1 are also accepted.
• diarize_model=latest auto-upgrades — Resolves to the newest GA diarizer. Today that's v2.
• No breaking changes — diarize=true continues to route to v1.
• Compatible with the rest of the platform — Works with Nova-1, Nova-2, Nova-3, enhanced, and base batch models (async and sync), monolingual and multilingual, alongside existing batch features.

New diarize_model parameter:

The new diarize_model parameter enables diarization and selects the model version in a single parameter — no need to also set diarize=true:

https://api.deepgram.com/v1/listen?model=nova-3&diarize_model=latest

Migration guidance:

• New integrations: For new projects we recommend diarize_model=latest. To pin a specific version, use diarize_model=v2 or diarize_model=v1.
• Existing diarize=true users: No breaking changes — your existing requests continue to work with v1. To pick up v2's improvements, update your requests to diarize_model=latest (always newest) or diarize_model=v2. We recommend testing on a representative sample of your audio before flipping production traffic.

No pricing changes. Diarization continues to be included at current rates.

• Available now on the /v1/listen endpoint, on both US-hosted and EU-hosted endpoints
• Supported on Nova-1, Nova-2, Nova-3, enhanced, and base batch models (async and sync), monolingual and multilingual
• Streaming: diarize_model is not accepted on streaming requests and returns 400. Use diarize=true for streaming diarization. Streaming improvements ship separately.
• Self-hosted support is now available. See Batch Diarization v2 Model Delivery for Self-Hosted Deployments for details.

Learn more in the Speaker Diarization documentation.

We’ve enhanced the Nova-3 Portuguese model with improved transcription accuracy across Portuguese language variants, including Brazilian Portuguese (pt-BR) and European Portuguese (pt-PT).

To use the updated model, set model="nova-3" and use one of the supported Portuguese language codes:

• language="pt"
• language="pt-BR"
• language="pt-PT"

Learn more about Nova-3 and supported languages on the Models and Language Overview page.