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On November 5, 2026, Hugging Face released Phonon, an on-device TTS model, offering two sizes of approximately 65 MB and 75 MB, covering English, French, German, Spanish, and Portuguese, with more than 100 built-in voices. Phonon 31m supports only English, is open-sourced under Apache 2.0, and can be used in commercial products; Phonon 40m covers five languages and uses a non-commercial license. The company says Phonon ranks first in German and Spanish intelligibility on the Open TTS Leaderboard and leads in CPU streaming first-packet latency benchmarks, and that its accompanying inference framework ptts supports more than 10 backends including CPU, GPU, and NPU. On the same day, Unite.AI reported that Gradium issued a technical follow-up statement saying Phonon surpassed 200,000 downloads within two weeks of launch, and provided 95th-percentile CPU first-audio latency figures: Phonon 31m English at 28 milliseconds, Phonon 40m English at 38 milliseconds, and Pocket TTS at 165 milliseconds; the report also said the open weights were released on October 20.
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Gradium's on-device TTS model Phonon surpasses 200,000 downloads in two weeksDevelopments
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- Source:Hugging Face
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Nov 5
Unite.AI
Gradium's on-device TTS model Phonon surpasses 200,000 downloads in two weeks
On November 5, Gradium released a technical follow-up note stating that its on-device TTS model Phonon surpassed 200,000 downloads within two weeks of launch. Phonon ranks first in German and Spanish intelligibility on the Open TTS Leaderboard, places in the top three across all evaluated languages, and has at most one percent of the parameter count of comparison models. For 95th-percentile CPU first-audio latency, Phonon 31m English is 28 milliseconds, Phonon 40m English is 38 milliseconds, and Pocket TTS is 165 milliseconds. Phonon's open weights were released on October 20; the English 31m model uses the Apache 2.0 license with 8-bit quantized weights at 64.5 MB, while the 40m multilingual version uses the CC BY-NC 4.0 license.
Hugging FaceFirst-party
Hugging Face releases on-device speech model Phonon, with the 31m version open-sourced under Apache 2.0
Hugging Face has released the on-device TTS model Phonon, offering two sizes of approximately 65 MB and 75 MB, covering English, French, German, Spanish, and Portuguese, with more than 100 built-in voices. Among them, Phonon 31m supports only English and is open-sourced under Apache 2.0, allowing use in commercial products; Phonon 40m covers five languages but uses a non-commercial license. The company states that it ranks first in German and Spanish intelligibility on the Open TTS Leaderboard and leads in the CPU streaming first-packet latency benchmark, and that the accompanying inference framework ptts supports more than 10 backends including CPU, GPU, and NPU.