# Flux TTS Overview

Flux TTS brings the Flux promise to speech synthesis: a model and API built for the realities of a voice agent pipeline, not a one-shot text-to-audio pipe. It is served on the `/v2/speak` endpoint and shares one set of Flux voices across two transports. When a user barges in, `Interrupt` reports exactly what they heard (`text_spoken`) — the hard part of agent state reconciliation, answered by the API instead of reconstructed by hand.

## Two transports, one voice family

| Transport                                  | Endpoint                                 | Best for                                                                                                        |
| ------------------------------------------ | ---------------------------------------- | --------------------------------------------------------------------------------------------------------------- |
| **Real-time / conversational** (WebSocket) | `wss://api.deepgram.com/v2/speak`        | Live voice agents: stream LLM tokens in, stream audio back, interrupt and resume across turns                   |
| **Batch / pre-recorded** (REST)            | `POST https://api.deepgram.com/v2/speak` | Pre-generating fixed audio (IVR prompts, notifications, audiobook lines) where the whole text is known up front |

Not sure which to use? See [Batch vs Streaming](/guides/flux-tts-batch-vs-streaming).

## Why Flux TTS

- **Streaming-first** — Stream LLM tokens straight into the socket; the server places flush boundaries internally.
- **Turn-based lifecycle** — Each agent response is a turn with a clean start/finish, reported per turn.
- **Cross-turn voice consistency** — Conversational state persists across turns, so tone carries forward. See [Cross-Turn Context](/guides/flux-tts-context).

On barge-in, `Interrupt` reports exactly what the user heard, and mid-stream `Configure` adjusts speed without reconnecting.

## Start here

::::card-grid
:::card{title="Real-Time Getting Started" href="/guides/flux-tts-quickstart"}
:::

:::card{title="Batch (REST) Getting Started" href="/guides/flux-tts-batch"}
:::

:::card{title="Batch vs Streaming" href="/guides/flux-tts-batch-vs-streaming"}
:::

:::card{title="Build a Flux TTS Voice Agent" href="/guides/flux-tts-voice-agent"}
:::

:::card{title="Migrating from Aura" href="/guides/flux-tts-migrating"}
:::
::::

***

## Related pages

- [Amazon SageMaker](./amazon-sagemaker-index.md)
- [Aura](./aura-index.md)
- [Changelog](../changelog.md)
- [Custom Vocabulary](./custom-vocabulary-index.md)
- [Deepgram's Docs](../index.md)
- [Deployment](./deployment-index.md)
- [Docker/Podman](./docker-podman-index.md)
- [Features](./features-index.md)
- [Flux TTS](./flux-tts-index.md)
- [Formatting](./formatting-index.md)

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