Open sourceOpen-source releaseSpeech & Audio2 sources · Oct 22, 2026

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.

Proof1 independent outlet1 community thread

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)

Extractive summary: sentences quoted from the sources.

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