Gradium Open-Sources Phonon, a 31M-Parameter On-Device TTS Model Under Apache 2.0
Gradium has open-sourced Phonon, a family of small text-to-speech models built to run on the device.

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Key points
- The Gradium Phonon on-device TTS model comes in 31M and 40M sizes.
- Performance: top English Elo among open models Gradium tested; about 7 ms to first audio on CPU.
- Phonon is an open-weight TTS family from Gradium, a Paris voice AI company spun out of Kyutai.
- Phonon 40m: 1 model per language (English, French, German, Spanish, Portuguese), CC BY-NC 4.0.
Sources (2)
- [1]Gradium Open-Sources Phonon, a 31M-Parameter On-Device TTS Model Under Apache 2.0MarkTechPost · Oct 22, 04:56 PM
Gradium has open-sourced Phonon, a family of small text-to-speech models built to run on the device.
The Gradium Phonon on-device TTS model comes in 31M and 40M sizes.
- [2]Phonon is now open-source, 31M and 40M TTS models designed to run on the edger/LocalLLaMA (top, daily) · Oct 20, 04:01 PM
Extractive summary: sentences quoted from the sources.
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