Deepgram Flux (conversational STT, English + Multilingual)
Speech and audio
flux-general-en
$0.0065 per minute
Deepgram Flux TTS
Voice-agent TTS served on /v2/speak (WebSocket for streaming LLM tokens, REST for batch).
Model idflux-haley-en
Price$0.045 per 1K characters
Checked29 September 2026
Where it stands
35newer speech and audio models since its release
- NVIDIA Nemotron 3.5 Transcribe (30B-A4B)28 Oct 2026
- Hy-SimulMT-30B-A3B22 Oct 2026
- Eleven Realtime v1 Max / Mini20 Oct 2026
- Voxtral Mini Transcribe 3 (+ Mini Transcribe Realtime 3)20 Oct 2026
- Voxtral Small Transcribe 320 Oct 2026
The 5 newest are listed. All speech and audio models
- Before it from Deepgram
- Deepgram Flux (conversational STT, English + Multilingual)2 Oct 2025
- Weights
- Closed weights; access is hosted only.
How to call it
2 ways to use Deepgram Flux TTS, with the model id each provider expects.
| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Deepgram API (real-time) | flux-haley-en |
wss://api.deepgram.com/v2/speak?model=flux-haley-en |
developers.deepgram.com |
| Deepgram API (batch) | flux-{voice}-en |
https://api.deepgram.com/v2/speak |
developers.deepgram.com |
Pricing
| Per 1K characters | $0.045 |
|---|
As published: “per 1K characters pay-as-you-go ($0.0405 Growth); free until 2026-09-12, standard pricing from 2026-09-13”.
Source: deepgram.com, checked 29 September 2026.
Specs
- Input
- Text
- Output
- Audio
- Context window
- Not published
- Max output
- Not published
- Open weights
- No
- Licence
- Proprietary
- Released
- 12 August 2026
- Status
- Current
- Type
- Speech and audio
What stands out
What its maker marketed at launch, and what people found later, each with its source.
Conversation-native TTS
Keeps context and voice consistency across turns of a conversation instead of treating each sentence in isolation; turn lifecycle events; on Interrupt reports exactly what the user heard (`text_spoken`).
~80 ms response, structured-content accuracy
Starts responding in as little as 80 ms under production load; tuned for account numbers, alphanumerics, drug names and money amounts.
Notes
English only (39 voices; American, British, Irish, Australian, Indian, Singaporean, Filipino accents); use Aura-2 for other languages. Self-hosted GA 2026-08-26; speed 0.5-1.5 and expressivity -2..2 controls. Launched alongside Deepgram passing $100M ARR.
Sources: https://developers.deepgram.com/docs/flux-tts/overview , https://developers.deepgram.com/docs/flux-tts/voices , https://deepgram.com/pricing , https://developers.deepgram.com/changelog