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

# Quick migration guide: realtime STT from AssemblyAI to Gladia

> Guide to seamlessly switch your realtime WebSocket transcription from AssemblyAI's SDK to Gladia's SDK.

This step-by-step guide shows how to switch your realtime transcription from AssemblyAI to Gladia with minimal code changes. It highlights equivalences, subtle differences, and drop‑in replacements so you can migrate quickly and confidently, without any regressions.

## Step-by-step guide

### Install the SDK

Install the official SDKs to enable realtime streaming. That's all you need to get started in Python or TypeScript.

*For AssemblyAI :*

<CodeGroup>
  ```bash Python theme={"system"}
  pip install assemblyai
  ```

  ```bash Typescript theme={"system"}
  npm i assemblyai
  ```
</CodeGroup>

*For Gladia:*

<CodeGroup>
  ```bash Python theme={"system"}
  pip install gladiaio-sdk
  ```

  ```bash Typescript theme={"system"}
  npm i @gladiaio/sdk
  ```
</CodeGroup>

### Initialize the client

Create and authenticate the client that manages your live connection. The shape is the same idea across providers—just swap the client and key.

*For AssemblyAI :*

<CodeGroup>
  ```python Python theme={"system"}
  from assemblyai.streaming.v3 import StreamingClient, StreamingClientOptions

  api_key = "<YOUR_ASSEMBLYAI_API_KEY>"

  assemblyClient = StreamingClient(
      StreamingClientOptions(
          api_key=api_key,
          api_host="streaming.assemblyai.com",
      )
  )
  ```

  ```typescript Typescript theme={"system"}
  import { AssemblyAI } from "assemblyai";

  const assemblyClient = new AssemblyAI({
    apiKey: process.env.ASSEMBLYAI_API_KEY!,
  });
  ```
</CodeGroup>

*For Gladia :*

<CodeGroup>
  ```python Python theme={"system"}
  from gladiaio_sdk import GladiaClient

  gladia_client = GladiaClient(api_key="<YOUR_GLADIA_API_KEY>")
  ```

  ```typescript Typescript theme={"system"}
  import { GladiaClient } from "@gladiaio/sdk";

  const gladiaClient = new GladiaClient({
    apiKey: process.env.GLADIA_API_KEY,
  });
  ```
</CodeGroup>

### Configure the session

Choose the model, audio format, and language options your app needs. Most parameters map one‑to‑one, so your existing settings carry over naturally.

#### AssemblyAI to Gladia parameter mapping

|     AssemblyAI    |                         Gladia                        | Notes / Example                                                                                                       |
| :---------------: | :---------------------------------------------------: | --------------------------------------------------------------------------------------------------------------------- |
|      `model`      |                        `model`                        | Choose the latest Gladia model ("solaria-1").                                                                         |
|     `encoding`    |                       `encoding`                      | Match the actual [audio format](/api-reference/v2/live/init#body-encoding) (e.g., `linear16` ↔ `wav/pcm`).            |
|                   |                      `bit_depth`                      | Choose the [bit depth](/api-reference/v2/live/init#body-bit-depth) value from your audio                              |
|   `sample_rate`   |                     `sample_rate`                     | Same unit (Hz).                                                                                                       |
|     `channels`    |                       `channels`                      | Same meaning.                                                                                                         |
| `interim_results` |     `messages_config.receive_partial_transcripts`     | Set `true` to receive [partials messages](/chapters/live-stt/features/partial-transcripts).                           |
|   `endpointing`   | `endpointing`; `maximum_duration_without_endpointing` | Port thresholds and consider a hard cap.                                                                              |
|     `language`    |    `language_config.languages` (+ `code_switching`)   | Pass one or more languages; enable switching when [multiple languages](/chapters/language/code-switching) are spoken. |

```json Gladia config example theme={"system"}
{
  "model": "solaria-1",
  "encoding": "wav/pcm",
  "bit_depth": 16,
  "sample_rate": 16000,
  "channels": 1,
  "language_config": { "languages": ["en"], "code_switching": false },
  "messages_config": {
    "receive_partial_transcripts": true,
    "receive_final_transcripts": true
  },
  "endpointing": 0.8,
  "maximum_duration_without_endpointing": 30,
  "realtime_processing": {
    "custom_vocabulary": false,
    "custom_spelling": false
  }
}
```

See the full schema in the [live init reference](/api-reference/v2/live/init).

### Start the transcription session

Open a live transcription session using your configuration. The flow is the same as with AssemblyAI: establish the WebSocket and get ready to stream audio.

*For AssemblyAI :*

<CodeGroup>
  ```python Python theme={"system"}
  from assemblyai.streaming.v3 import StreamingParameters

  assemblyClient.connect(
      StreamingParameters(
          sample_rate=16000,
          format_turns=True,
      )
  )
  ```

  ```typescript Typescript theme={"system"}
  const assemblySession = assemblyClient.streaming.transcriber({
    sampleRate: 16_000,
    formatTurns: true,
  });

  await assemblySession.connect();
  ```
</CodeGroup>

*For Gladia :*

<CodeGroup>
  ```python Python theme={"system"}
  gladia_session = gladia_client.live_v2().start_session(gladia_config)
  ```

  ```typescript Typescript theme={"system"}
  const gladiaSession = gladiaClient.liveV2().startSession(gladiaConfig);
  ```
</CodeGroup>

### Send audio chunks

Stream audio frames to the session as they are produced. Both SDKs accept small chunks continuously—keep your existing chunking logic.

*For AssemblyAI :*

<CodeGroup>
  ```python Python theme={"system"}
  assemblyClient.stream(audio_chunk)
  ```

  ```typescript Typescript theme={"system"}
  assemblySession.stream(audioChunk);
  ```
</CodeGroup>

*For Gladia :*

<CodeGroup>
  ```python Python theme={"system"}
  gladia_session.send_audio(audio_chunk)
  ```

  ```typescript Typescript theme={"system"}
  gladiaSession.sendAudio(audioChunk);
  ```
</CodeGroup>

### Read transcription messages

After audio is flowing, subscribe to transcript and lifecycle events. The mapping below shows how to translate AssemblyAI listeners to Gladia in a single place.

Event mapping from AssemblyAI to Gladia:

* `Transcript` → listen to Gladia `message` and branch on `message.data.is_final` to separate partial vs final results.
* `Open`/`Close`/`Error` → map to Gladia `started`/`ended`/`error`.

In practice, subscribe once to `message` and use the `is_final` flag instead of wiring separate listeners—less boilerplate, same control. To receive partials, enable `messages_config.receive_partial_transcripts: true` in your init config.

*For AssemblyAI :*

<CodeGroup>
  ```python Python theme={"system"}
  from typing import Type

  from assemblyai.streaming.v3 import (
      BeginEvent,
      StreamingClient,
      StreamingError,
      StreamingEvents,
      StreamingSessionParameters,
      TerminationEvent,
      TurnEvent,
  )


  def on_begin(self: Type[StreamingClient], event: BeginEvent):
      print(f"Session started: {event.id}")


  def on_turn(self: Type[StreamingClient], event: TurnEvent):
      print(f"{event.transcript} ({event.end_of_turn})")

      if event.end_of_turn and not event.turn_is_formatted:
          params = StreamingSessionParameters(
              format_turns=True,
          )
          self.set_params(params)


  def on_terminated(self: Type[StreamingClient], event: TerminationEvent):
      print(
          f"Session terminated: {event.audio_duration_seconds} seconds of audio processed"
      )


  def on_error(self: Type[StreamingClient], error: StreamingError):
      print(f"Error occurred: {error}")


  client.on(StreamingEvents.Begin, on_begin)
  client.on(StreamingEvents.Turn, on_turn)
  client.on(StreamingEvents.Termination, on_terminated)
  client.on(StreamingEvents.Error, on_error)
  ```

  ```typescript Typescript theme={"system"}
  assemblySession.on("open", ({ id }) => {
    console.log(`Session opened with ID: ${id}`);
  });

  assemblySession.on("error", (error) => {
    console.error("Error:", error);
  });

  assemblySession.on("close", (code, reason) =>
    console.log("Session closed:", code, reason),
  );

  assemblySession.on("turn", (turn) => {
    if (!turn.transcript) {
      return;
    }

    console.log("Turn:", turn.transcript);
  });
  ```
</CodeGroup>

*For Gladia :*

<CodeGroup>
  ```python Python theme={"system"}
  from gladiaio_sdk import (
      LiveV2WebSocketMessage,
      LiveV2InitResponse,
      LiveV2EndedMessage,
  )

  @live_session.on("message")
  def on_message(message: LiveV2WebSocketMessage):
      # Partial and final transcripts are delivered here
      # filter them with message.data.is_final field
      print(message)

  @live_session.once("started")
  def on_started(_response: LiveV2InitResponse):
      print("Session started. Listening...")

  @live_session.once("ended")
  def on_ended(_ended: LiveV2EndedMessage):
      print("Session ended.")

  @live_session.on("error")
  def on_error(error: Exception):
      print(f"Error: {error}")
  ```

  ```typescript Typescript theme={"system"}
  gladiaSession.on("message", (message) => {
    // Partial and final transcripts are delivered here
    // filter them with message.data.is_final field
    console.log(message);
  });

  gladiaSession.on("started", (info) => {
    console.log("Start session", info);
  });

  gladiaSession.on("ended", (info) => {
    console.log("End session", info);
  });

  gladiaSession.on("error", (err) => {
    console.error("Error", err);
  });
  ```
</CodeGroup>