### Authentication

`X-Hume-Api-Key` string

API Key authentication via header

### Request

This endpoint expects an object.

- **utterances** list of objects Required

A list of **Utterances** to be converted to speech output.

An **Utterance** is a unit of input for [Octave](https://dev.hume.ai/docs/text-to-speech-tts/overview), and includes input `text`, an optional `description` to serve as the prompt for how the speech should be delivered, an optional `voice` specification, and additional controls to guide delivery for `speed` and `trailing_silence`.

- **context** object or null Optional

Utterances to use as context for generating consistent speech style and prosody across multiple requests. These will not be converted to speech output.

- **format** object Optional Defaults to `{"type":"mp3"}`

Specifies the output audio file format.

- **include_timestamp_types** list of enums Optional Defaults to `[]`

The set of timestamp types to include in the response. Only supported for Octave 2 requests.

Allowed values: word, phoneme

- **num_generations** integer Optional `1-5` Defaults to `1`

Number of audio generations to produce from the input utterances.

- **split_utterances** boolean Optional Defaults to `true`

Controls how audio output is segmented in the response.

- **strip_headers** boolean Optional Defaults to `false`

If enabled, the audio for all the chunks of a generation, once concatenated together, will constitute a single audio file.

- **temperature** double or null Optional `0.1-1`

Sampling temperature for the speech generation model. Higher values increase variation; lower values increase consistency.

- **version** enum Optional

Selects the Octave model version used to synthesize speech for this request.

- **instant_mode** boolean Optional Defaults to `true`

Enables ultra-low latency streaming, significantly reducing the time until the first audio chunk is received.

### Response

OK

### Errors

422

Unprocessable Entity Error