Qwen Audio 3.1 TTS Plus API

About Qwen Audio 3.1 TTS Plus

Speech synthesis for narration and dubbing, with 4 multilingual voices, plain-language delivery direction, inline emotion tags, and voice cloning.

Choose one of 4 voices with voice. Direct the delivery with instruction and with inline tags inside the text. Set voice to custom with voice_audio_url and voice_consent to clone a voice.

Also known as Qwen Audio TTS Plus, Qwen Audio TTS, Alibaba Cloud Qwen Audio 3.1 TTS Plus

Qwen Audio 3.1 TTS Plus specs

Model ID

qwen-audio-3-1-tts-plus

Author

Alibaba Cloud

Category

Audio Generation

Released

Oct 21, 2026

Input

Text

Output

Audio

Region

Singapore

Endpoints

POST/v1/audio/speechPOST/v1/audio/speech:streamWEBSOCKET/v1/realtimeGET/v1/voices

Alternate model IDs

qwen-audio-3.1-tts-plusalibaba/qwen-audio-3-1-tts-plus

Qwen Audio 3.1 TTS Plus API pricing

Live pay-as-you-go rates from the EmpirioLabs catalog. You are billed only for what you use, with no monthly minimum.

How to call the Qwen Audio 3.1 TTS Plus API

Qwen Audio 3.1 TTS Plus serves speech through POST /v1/audio/speech and returns playable audio. Send the text to speak as input with the model id qwen-audio-3-1-tts-plus. Get an API key from the EmpirioLabs dashboard.

curl https://api.empiriolabs.ai/v1/audio/speech \
  -H "Authorization: Bearer $EMPIRIOLABS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "qwen-audio-3-1-tts-plus",
    "input": "Welcome to EmpirioLabs. Your build just finished."
  }' \
  --output speech.mp3

import requests

response = requests.post(
    "https://api.empiriolabs.ai/v1/audio/speech",
    headers={"Authorization": "Bearer YOUR_EMPIRIOLABS_API_KEY"},
    json={"model": "qwen-audio-3-1-tts-plus", "input": "Welcome to EmpirioLabs."},
)
with open("speech.mp3", "wb") as f:
    f.write(response.content)

Qwen Audio 3.1 TTS Plus API parameters

Request parameters supported by the Qwen Audio 3.1 TTS Plus API on EmpirioLabs. Defaults apply when a field is omitted.

Good to know

Voices

• 4 voices that read Chinese, English, and other languages: longanlingxin_v3.1, longanhuan_v3.1, and longanfengyue_v3.1 are female, and xunanchuan_v3.1 is male.
• Every voice id ends in _v3.1, for example longanlingxin_v3.1.

Custom voices

• Set voice to custom, pass voice_audio_url, an https URL to 10 to 20 seconds of clear speech from one speaker, and set voice_consent to true to confirm that you have the speaker's permission to clone their voice.
• WAV, MP3, M4A, OGG, WEBM and FLAC are accepted, up to 15 MB. Record in a quiet room, without music or other voices.
• The response includes voice_id and voice_id_expires_at. Pass the voice_id as voice to reuse the voice for 7 days, on POST /v1/audio/speech, POST /v1/audio/speech:stream or the realtime socket, where session.update takes the same fields and session.updated returns the voice_id. Only the account that created it can use it, on this model only.
• Each account can hold 10 custom voices on this model at a time.
• GET /v1/voices?model=qwen-audio-3-1-tts-plus lists the model's voices, including your custom voices with their ids. Add type=custom to list custom voices alone.
• DELETE /v1/voices/{voice_id}?model=qwen-audio-3-1-tts-plus deletes a custom voice, which frees its place at once.
• In the Playground, set Voice to Custom to use a saved voice again, copy its id, or delete it.
• Creating, listing and deleting custom voices adds no charge.

Delivery direction

• instruction sets emotion, tone, character, pace, and speaking style in natural language, up to 1,000 characters.
• Inline tags inside the text change the delivery from that point, for example [excited] or [whispers], or add a one-time sound such as [laughing] or [sighing]. The full list of tags is on the input parameter.
• SSML input is not supported.

Input limits

• Up to 10,000 characters per request.
• language_hints biases pronunciation for mixed-language text.

Output

• MP3, WAV, PCM, or Opus at 8,000 to 48,000 Hz.
• POST /v1/audio/speech:stream sends audio chunks while the speech is generated.

Realtime

• WEBSOCKET /v1/realtime?model=qwen-audio-3-1-tts-plus takes text while it is still being written and returns audio as it is generated. Send input_text_buffer.append events, then input_text_buffer.commit, or session.finish to end the session.
• Audio arrives in response.audio.delta events: 16-bit PCM at 24,000 Hz by default, or MP3 or Opus. Set the voice, instruction, format and other options with session.update; a change applies from the next segment.
• Text is spoken in segments that end at sentence boundaries, and each segment ends with a response.done event carrying its usage.

Billing

• Billed per character of the input text. A Chinese character counts as two characters, and inline tags count as characters. The instruction is not billed.
• On the realtime socket each segment is billed for its own characters.

Qwen Audio 3.1 TTS Plus API: common questions

How much does the Qwen Audio 3.1 TTS Plus API cost?

On EmpirioLabs, Qwen Audio 3.1 TTS Plus is billed pay as you go: Synthesis $0.60 per 10,000 characters. The live rate card on this page always matches what the API charges.

Which endpoint does Qwen Audio 3.1 TTS Plus use?

Qwen Audio 3.1 TTS Plus is served through POST /v1/audio/speech on api.empiriolabs.ai with standard bearer-token authentication.

Can I try Qwen Audio 3.1 TTS Plus in the browser before integrating?

Open the EmpirioLabs playground and press Start session to try it in your browser. Qwen Audio 3.1 TTS Plus runs over a WebSocket rather than a request and response, so to build with it start from the realtime voice quickstart. Connect from your server with your EmpirioLabs API key and the model id qwen-audio-3-1-tts-plus, then stream audio in both directions.

How do I get a Qwen Audio 3.1 TTS Plus API key?

Create an EmpirioLabs account, then generate a key under API Keys in the dashboard. Billing is pay-as-you-go credits, so you only pay for the requests you make.