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voiceai-sdk is the official Python client for the SLNG API. It targets Python 3.9+ and ships both a synchronous Slng client and an AsyncSlng for asyncio code.

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Install

pip install voiceai-sdk
Or with uv: 
uv add voiceai-sdk

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Initialize the client

Get a key from app.slng.ai, then construct the client: 
from voiceai_sdk import Slng

client = Slng()                      # reads SLNG_API_KEY
client = Slng(api_key="zpka_...")    # or pass it explicitly

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Text-to-speech

from voiceai_sdk import Slng

client = Slng()

audio = client.text_to_speech.create(
    model_variant="slng/deepgram/aura:2-en",
    text="Hello from the SLNG Python SDK.",
    voice="aura-2-thalia-en",
)

audio.write_to_file("hello.wav")

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Speech-to-text

from pathlib import Path
from voiceai_sdk import Slng

client = Slng()

transcript = client.speech_to_text.create(
    model_variant="slng/deepgram/nova:3-en",
    audio=Path("meeting.wav"),
)

print(transcript.text)

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Async client

For asyncio applications, swap Slng for AsyncSlng: 
import asyncio
from pathlib import Path
from voiceai_sdk import AsyncSlng

async def main():
    client = AsyncSlng()
    transcript = await client.speech_to_text.create(
        model_variant="slng/deepgram/nova:3-en",
        audio=Path("meeting.wav"),
    )
    print(transcript.text)

asyncio.run(main())

​
Discover models

models = client.models.list()
voices = client.voices.list(model="slng/deepgram/aura:2-en")