Voxtral TTS

Mistral's open-weight text-to-speech model: 4B parameters, 9 languages, zero-shot voice cloning, only 3 GB VRAM.

Spec	Value
Developer	Mistral AI
Parameters	4 billion
Architecture	Decoder-only TTS
Languages	9 (English, French, German, Spanish, Hindi, Arabic, Portuguese, Italian, Japanese)
License	Apache 2.0 (open weights)
VRAM	~3 GB (FP16)
Latency	70 ms for 10-second output
Voice cloning	Zero-shot from 3-second reference
Release	March 26, 2026

Why Voxtral TTS?

Voxtral TTS is Mistral's open-weight answer to ElevenLabs and OpenAI TTS. Key advantages for Clore.ai users:

• Runs on any GPU — only 3 GB VRAM means even an RTX 3060 works perfectly

• No API fees — self-hosted = unlimited synthesis at zero marginal cost

• Data privacy — audio never leaves your machine

• Zero-shot cloning — clone any voice from 3 seconds of reference audio

• 9 languages natively — including Hindi and Arabic, often missing from competitors

• Real-time speed — RTF 0.1–0.2× on RTX 4070+ (10-second clip in 1–2 seconds)

GPU Requirements on Clore.ai

GPU	VRAM	Performance	Clore.ai Price
RTX 3060 12GB	12 GB	✅ Good — 3–4× real-time	from $0.10/day
RTX 3090 24GB	24 GB	✅ Great — batch processing	from $0.30/day
RTX 4070 12GB	12 GB	✅ Excellent — 5–10× real-time	from $0.25/day
RTX 4090 24GB	24 GB	✅ Overkill — sub-second latency	from $0.50/day

Recommendation: An RTX 3060 12GB ($0.10/day on Clore.ai) is the sweet spot for most use cases. Voxtral only needs 3 GB VRAM, so you can run it alongside other models.

Quick Start on Clore.ai

Step 1: Rent a GPU Server

1. Go to Clore.ai Marketplace

2. Filter for any GPU with 8+ GB VRAM

3. Select a Docker deployment

4. Use image: pytorch/pytorch:2.4.0-cuda12.4-cudnn9-devel

Step 2: Install Dependencies

# Connect via SSH or Jupyter terminal
pip install torch torchaudio transformers accelerate

# Install Voxtral TTS package
pip install voxtral-tts

# Or use HuggingFace directly
pip install huggingface_hub
huggingface-cli download mistralai/Voxtral-TTS --local-dir ./voxtral-tts

Step 3: Basic Text-to-Speech

from voxtral import VoxtralTTS

# Initialize model (auto-downloads weights ~6 GB)
model = VoxtralTTS.from_pretrained("mistralai/Voxtral-TTS")
model.to("cuda")

# Basic synthesis
audio = model.synthesize(
    text="Welcome to Clore.ai — the decentralized GPU marketplace.",
    language="en"
)
audio.save("output.wav")
print(f"Generated {audio.duration:.1f}s of audio")

Step 4: Zero-Shot Voice Cloning

# Clone a voice from 3-second reference
audio = model.synthesize(
    text="This is my cloned voice speaking about GPU computing.",
    reference_audio="reference_speaker.wav",  # 3+ seconds
    language="en"
)
audio.save("cloned_output.wav")

Step 5: Multi-Language Synthesis

# Synthesize in 9 supported languages
languages = {
    "en": "Hello, this is Voxtral speaking in English.",
    "fr": "Bonjour, c'est Voxtral qui parle en français.",
    "de": "Hallo, hier spricht Voxtral auf Deutsch.",
    "es": "Hola, Voxtral hablando en español.",
    "hi": "नमस्ते, यह Voxtral हिंदी में बोल रहा है।",
    "ar": "مرحبا، هذا Voxtral يتحدث بالعربية.",
    "pt": "Olá, aqui é o Voxtral falando em português.",
    "it": "Ciao, qui parla Voxtral in italiano.",
    "ja": "こんにちは、Voxtralが日本語で話しています。",
}

for lang, text in languages.items():
    audio = model.synthesize(text=text, language=lang)
    audio.save(f"voxtral_{lang}.wav")
    print(f"[{lang}] Generated {audio.duration:.1f}s")

Production API Server

Deploy Voxtral as a REST API for integration into your applications:

# server.py — FastAPI wrapper for Voxtral TTS
from fastapi import FastAPI, UploadFile, File
from fastapi.responses import StreamingResponse
from voxtral import VoxtralTTS
import io
import soundfile as sf

app = FastAPI(title="Voxtral TTS API")
model = VoxtralTTS.from_pretrained("mistralai/Voxtral-TTS").to("cuda")

@app.post("/synthesize")
async def synthesize(
    text: str,
    language: str = "en",
    reference: UploadFile = File(None)
):
    kwargs = {"text": text, "language": language}
    if reference:
        ref_bytes = await reference.read()
        kwargs["reference_audio"] = ref_bytes
    
    audio = model.synthesize(**kwargs)
    
    # Return as WAV stream
    buffer = io.BytesIO()
    sf.write(buffer, audio.numpy(), samplerate=24000, format="WAV")
    buffer.seek(0)
    
    return StreamingResponse(buffer, media_type="audio/wav")

@app.get("/health")
async def health():
    return {"status": "ok", "model": "voxtral-tts", "languages": 9}

# Run the API server
pip install fastapi uvicorn python-multipart soundfile
uvicorn server:app --host 0.0.0.0 --port 8000

# Test it
curl -X POST "http://localhost:8000/synthesize?text=Hello%20world&language=en" \
  --output hello.wav

Docker Deployment

FROM pytorch/pytorch:2.4.0-cuda12.4-cudnn9-devel

WORKDIR /app
RUN pip install voxtral-tts fastapi uvicorn python-multipart soundfile

# Pre-download model weights
RUN python -c "from voxtral import VoxtralTTS; VoxtralTTS.from_pretrained('mistralai/Voxtral-TTS')"

COPY server.py .
EXPOSE 8000
CMD ["uvicorn", "server:app", "--host", "0.0.0.0", "--port", "8000"]

# Build and run
docker build -t voxtral-tts-api .
docker run --gpus all -p 8000:8000 voxtral-tts-api

Voxtral vs Other TTS Models

Feature	Voxtral TTS	ElevenLabs	Qwen3-TTS	Kokoro TTS	Fish Speech
Open weights	✅ Apache 2.0	❌ API only	✅	✅	✅
VRAM	3 GB	N/A (cloud)	8 GB	2 GB	4 GB
Languages	9	30+	50+	5	8
Voice cloning	3s ref	1s ref	5s ref	❌	10s ref
Latency	70 ms	~200 ms	~150 ms	50 ms	100 ms
Quality	⭐⭐⭐⭐⭐	⭐⭐⭐⭐⭐	⭐⭐⭐⭐	⭐⭐⭐⭐	⭐⭐⭐⭐
Self-hosted	✅	❌	✅	✅	✅

Batch Processing for Large Projects

import concurrent.futures
from voxtral import VoxtralTTS

model = VoxtralTTS.from_pretrained("mistralai/Voxtral-TTS").to("cuda")

# Process an entire audiobook chapter
paragraphs = [
    "Chapter 1: The Beginning...",
    "It was a dark and stormy night...",
    "The protagonist stepped forward...",
    # ... hundreds of paragraphs
]

def process_paragraph(idx_text):
    idx, text = idx_text
    audio = model.synthesize(text=text, language="en")
    audio.save(f"chapter1_part{idx:04d}.wav")
    return idx

# Sequential processing (GPU-bound)
for i, text in enumerate(paragraphs):
    process_paragraph((i, text))
    
print(f"Processed {len(paragraphs)} paragraphs")

Streaming Mode for Real-Time Applications

# Streaming synthesis for live applications
async def stream_synthesis(text: str, language: str = "en"):
    """Generate audio in streaming chunks for low-latency playback."""
    model = VoxtralTTS.from_pretrained("mistralai/Voxtral-TTS").to("cuda")
    
    async for chunk in model.synthesize_stream(
        text=text,
        language=language,
        chunk_size=4096  # ~170ms per chunk at 24kHz
    ):
        yield chunk.numpy().tobytes()

Troubleshooting

Issue	Solution
OOM on small GPU	Use model.half() for FP16 (halves VRAM to ~1.5 GB)
Slow first inference	Normal — model compiles CUDA kernels on first run (~30s)
Poor quality for language X	Ensure correct language parameter; some languages need longer reference audio
Audio artifacts	Increase reference_audio length to 5–10s for better voice cloning
Model download fails	Set HF_TOKEN env variable for gated model access

Cost Analysis: Voxtral on Clore.ai vs Cloud TTS

Service	1M characters/month	Notes
ElevenLabs Pro	$99/mo	500K chars included, overage fees
OpenAI TTS	$15/mo	$15 per 1M characters
Google Cloud TTS	$16/mo	Standard voices
Voxtral on Clore.ai	$3–15/mo	RTX 3060 @ $0.10–0.50/day, unlimited chars

Bottom line: Self-hosting Voxtral on Clore.ai is 6–30× cheaper than cloud TTS APIs, with zero character limits and full data privacy.

Further Reading

• Voxtral TTS on HuggingFace

• Mistral AI Blog — Voxtral Announcement

• Compare TTS models on Clore.ai

• Other Audio & Voice guides

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Last updated: March 30, 2026