Gradium Phonon: open text-to-speech models small enough to run on a laptop CPU

PhononFree, open weights

Gradium released Phonon, a set of tiny open-weight text-to-speech models, the smallest of which is 31 million parameters and a 64 MB download. Gradium says it starts speaking in 7 milliseconds on a laptop CPU, with no GPU needed.

What it does

Phonon 31m speaks English with 37 voices and is Apache 2.0. Phonon 40m covers English, French, German, Spanish and Portuguese, and the 40m multilingual version has 102 voices; both 40m models are CC BY-NC. Good for scratch voiceover and temp dialogue while you cut.

Worth knowing

Runs through Gradium's xn-ptts code and is already in MLX-Audio, Transformers, LM Studio and Ollama. Only the 31m English model allows commercial use.

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