> ## Documentation Index
> Fetch the complete documentation index at: https://doc.rapida.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Smallest AI STT

> Configure Smallest AI Pulse speech-to-text in assistant-api.

Smallest AI's Pulse model streams over a realtime WebSocket with 64ms time-to-first-transcript, supporting 38 languages plus word/sentence-level timestamps, speaker diarization, and PII/PCI redaction.

**Provider identifier:** `smallest`

***

## Vault Credential

| Key   | Description                                                                             |
| ----- | --------------------------------------------------------------------------------------- |
| `key` | Smallest AI API key from [app.smallest.ai/dashboard](https://app.smallest.ai/dashboard) |

***

## Setup

<Steps>
  <Step title="Get a Smallest AI API key">
    Sign in at [app.smallest.ai/dashboard](https://app.smallest.ai/dashboard) → **Developer → API Keys**.
  </Step>

  <Step title="Add to Rapida vault">
    In the Rapida dashboard → **Providers and Models**, add a credential, select provider **Smallest AI**, enter `key` = your API key.

    The same credential is used for both Smallest AI STT and TTS.
  </Step>

  <Step title="Configure the assistant">
    In the assistant's deployment settings → **Audio Input (STT)**, select **Smallest AI**.

    | Option                       | Example | Description                                                                          |
    | ---------------------------- | ------- | ------------------------------------------------------------------------------------ |
    | `listen.model`               | `pulse` | Only `pulse` is wired to the realtime endpoint — Pulse Pro is pre-recorded/HTTP only |
    | `listen.language`            | `en`    | ISO language code, or omit for auto-detect across 38 languages                       |
    | `listen.word_timestamps`     | `true`  | Per-word start/end/confidence timing                                                 |
    | `listen.sentence_timestamps` | `true`  | Sentence-level utterance segments                                                    |
    | `listen.diarize`             | `true`  | Speaker labels on words/utterances                                                   |
    | `listen.redact_pii`          | `true`  | Redacts names, addresses, phone numbers as `[ENTITYTYPE_N]` placeholders             |
    | `listen.redact_pci`          | `true`  | Redacts card numbers, CVVs, ZIP codes, account numbers                               |
    | `listen.numerals`            | `auto`  | Inverse text normalization mode                                                      |
    | `listen.smart_format`        | `true`  | Punctuation/capitalization in the transcript (defaults to `true` server-side)        |

    All feature flags are opt-in — omitted entirely from the connection string unless explicitly set.
  </Step>
</Steps>

***

<CardGroup cols={2}>
  <Card title="Smallest AI TTS" icon="volume" href="/opensource/services/assistant-api/tts/smallest">
    Smallest AI Lightning text-to-speech
  </Card>

  <Card title="STT Overview" icon="audio-waveform" href="/opensource/services/assistant-api/stt/overview">
    All STT providers
  </Card>
</CardGroup>