Note on parameter count. Hugging Face reports ~5B parameters from the safetensors metadata, inflated due to how AWQ4 stores each group of 8 int4 weights packed into a single int32 tensor. Actual disk and VRAM footprint of the model is roughly (4.3 GB).

AWQ4-GEN

General-purpose AWQ4 W4A16 quant of Voxtral-Mini-3B-2507, calibrated across 8 European languages.

When to pick this variant

Use this if you serve mixed-language audio and want the safest all-around AWQ4. Matches the bf16 baseline on Polish, near-parity on Spanish and English, and 2x faster.

Benchmarks vs bf16 baseline

Data: FLEURS + Common Voice 15 + Multilingual LibriSpeech + ylacombe/google-argentinian-spanish (es-AR). Hardware: 2x RTX 4090, vLLM 0.25. Bold = best 4-bit variant.

Metric	Voxtral-Mini bf16 (baseline)	AWQ4-ARG	AWQ4-EN	AWQ4-GEN
WER es	5.82	4.68	4.60	4.55
WER de	6.06	7.13	6.66	8.16
WER fr	8.01	10.59	6.70	9.33
WER it	6.50	7.02	7.01	6.94
WER pt	7.16	7.21	6.14	6.08
WER nl	9.24	7.95	11.29	10.59
WER en (no MLS)	6.65	7.00	6.96	7.01
WER avg-6	7.13	7.43	7.07	7.61
WER es-AR	4.69	5.00	5.11	5.04
VRAM (weights)	8.8 GB	4.36 GB	4.36 GB	4.36 GB
Throughput (tok/s, higher=better)	170.9	185.0	186.3	186.5

Usage (vLLM)

bash

# 1. In your vLLM venv, add the deps Voxtral needs
uv pip install --python /path/to/vllm/venv/python "mistral-common[soundfile]"

# 2. Serve
vllm serve JuanGiner/AWQ4-GEN \
    --tokenizer-mode mistral \
    --config-format mistral \
    --max-model-len 8192 \
    --gpu-memory-utilization 0.9 \
    --port 8000

Then send audio to POST /v1/audio/transcriptions in OpenAI-compatible format.

Calibration

480 audio samples symmetric across 8 languages (60 per language via google/fleurs + ylacombe/google-argentinian-spanish). Fixes the Polish regression seen in the text-calibrated AWQ4.

Quantization was done with llmcompressor 0.10 (AWQ modifier, W4A16 scheme, group_size=128, duo_scaling=True), targeting Linear modules inside LlamaDecoderLayer. The compressed-tensors format matches what vLLM 0.25.x expects for AWQ models (weights re-fused for the vLLM Voxtral loader).

Base model & license

Base: mistralai/Voxtral-Mini-3B-2507, Apache-2.0. This quantized derivative is released under the same license.

juanginer/Voxtral-Mini-3B-2507-AWQ4-GEN