Voxtral-Mini-4B-Realtime-2602
by mistralai
Open-source realtime streaming speech-to-text with sub-500ms latency across 13 languages
mistralai/Voxtral-Mini-4B-Realtime-2602mixpeek://transcription@v1/mistral_voxtral_mini_4b_v1Deploy Voxtral-Mini-4B-Realtime-2602
Single-tenantMixpeek has no managed extractor for this model. On a single-tenant deployment you upload the weights and a custom plugin serves them next to the rest of your pipeline.
Overview
Voxtral Mini 4B Realtime is among the first open-source speech models to achieve offline-comparable accuracy with sub-500ms latency. Its natively streaming architecture pairs a causal audio encoder (~0.6B params) with a Ministral-3-based LLM decoder (~3.4B params), both using sliding window attention for constant-memory streaming inference.
On Mixpeek, Voxtral powers realtime and near-realtime transcription of audio and video content across 13 languages, with configurable latency from 240ms to 2.4s to balance speed against accuracy for live subtitling or batch processing.
Architecture
Two-component streaming architecture: (1) causal transformer audio encoder (0.6B params, 32 layers, causal attention) and (2) Ministral-3-based LLM decoder (3.4B params, 26 layers). Both use sliding window attention for streaming. Configurable transcription delay from 240ms to 2.4s.
How it runs
Mixpeek SDK Integration
// No extractor parameter takes a Hugging Face model id (checked against
// GET /v1/discovery/extractors, which returns 13), so Voxtral-Mini-4B-Realtime-2602 runs
// on your side and the output is upserted through POST
// /v1/namespaces/{namespace_id}/documents/upsert. On Enterprise the other
// path is to upload the weights instead: POST /v1/namespaces/{id}/models
// accepts the huggingface format and a custom plugin loads them.
const res = await fetch(
"https://api.mixpeek.com/v1/namespaces/ns_your_namespace/documents/upsert",
{
method: "POST",
headers: {
Authorization: "Bearer API_KEY",
"Content-Type": "application/json",
},
body: JSON.stringify({
collection_id: "col_your_collection",
documents: [
{
document_id: "asset-00412",
// The model produces text, so it lands in payload. Give the
// collection a text vector index and embed that text to make it
// searchable rather than only filterable.
payload: { extracted_text: modelOutput, source_key: "archive/2026/asset-00412" },
vectors: { "text-embedding": embeddingOfModelOutput },
},
],
}),
},
);
// Managed alternative, if this exact model is not the requirement:
// universal_extractor@v1 runs google/gemini-embedding-2
// (3072-d) over a bucket, with no inference of your own.Capabilities
- Realtime streaming transcription with <500ms latency
- 13 language support including English, Spanish, French, German
- Configurable latency/accuracy tradeoff (240ms-2.4s delay)
- Natively streaming architecture (no chunking workarounds)
- Apache 2.0 open-source
Use Cases on Mixpeek
Benchmarks
| Dataset | Metric | Score | Source |
|---|---|---|---|
| FLEURS (13 languages, 480ms) | Average WER | 8.72% | Mistral AI, Feb 2026: Voxtral Realtime paper |
| FLEURS English (480ms) | WER | 4.90% | Mistral AI, Feb 2026: Voxtral Realtime paper |
| FLEURS (13 languages, 2.4s) | Average WER | 6.73% | Mistral AI, Feb 2026: Voxtral Realtime paper |
Performance
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Specification
Research Paper
Voxtral Realtime
arxiv.orgBuild a pipeline with Voxtral-Mini-4B-Realtime-2602
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