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Kyutai STT Review

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Streaming-first open STT for self-hosted voice agents

Among the 43 speech-to-text tools we track, Kyutai STT has the 42nd-widest language coverage.

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Facts verified Jul 20, 2026Website →

What we know about Kyutai STT

Kyutai STT sits in the speech-to-text apis category, where it is streaming-first open STT for self-hosted voice agents. We keep this Kyutai STT profile grounded in primary sources, each fact dated to when we last confirmed it.

Kyutai STT does not publish a public per-minute rate we have been able to verify, so the price figure here stays blank until we can confirm one. We would rather show nothing than a guessed number; if you have a current Kyutai STT quote, it is the fastest way for us to close that gap.

On capabilities, Kyutai STT covers word-level timestamps, self-host / on-prem option, and websocket streaming api. Each of those is verified against Kyutai STT's own docs or dashboard, not marketing copy.

Among the 43 speech-to-text tools in our matrix, Kyutai STT leads with the 42nd-widest language coverage; the fact sheet below has the raw numbers behind that placement.

In total we track 14 verified facts for Kyutai STT today, each linking the primary source it came from so you can check our work - and vendor claims we have not measured ourselves are labeled as such on the Kyutai STT fact sheet below.

Reviewed by vsref Editorialfacts verified Jul 20, 2026Methodology →

Fact sheet

Capabilities
Capabilities facts
WER (vendor-claimed)~6.4 % WERJul 20
Streaming latency (vendor-claimed)~500 msJul 20
Languages supported2 languagesJul 20
Word-level timestamps✓ YesJul 20
Compliance & trust
Compliance & trust facts
Self-host / on-prem option✓ YesJul 20
Model weights licenseCC-BY-4.0Jul 20
Build experience
Build experience facts
Official SDKsPython (PyTorch), Rust, MLXJul 20
Max file size / durationHandles audio up to 2 hours per sequenceJul 20
Supported audio formats24 kHz mono audioJul 20
Websocket streaming API✓ YesJul 20
Commercial
Commercial facts
Model size (parameters)1B (en/fr), 2.6B (en)Jul 20
Hardware to self-hostGPU for serving; MLX on-device on Apple siliconJul 20
Project maintenance statusActive - latest commit 2026-01-26Jul 20
GitHub stars2,980 starsJul 20

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