Capability change announced May 26, 2026
Gradium documents a capability change: “Phonon, our 100M-parameter on-device Text-To-Speech model, now reaches a 1.00% word error rate on the Seed-TTS English benchmark, outperforming NeuTTS Air…”
- Hosting route
- First-party API
- Affected scope
- On-device
- Announced
- May 26, 2026
- First seen by ModelClock
- Oct 20, 2026
What the provider published
gradium.ai ↗Phonon, our 100M-parameter on-device Text-To-Speech model, now reaches a 1.00% word error rate on the Seed-TTS English benchmark, outperforming NeuTTS Air (552M), KaniTTS2 (450M), and NeuTTS Nano (229M). With voice cloning disabled and a fixed high-quality voice, Phonon drops to 0.83% WER, ahead of Kokoro and Magpie. Phonon is based on Continuous Audio Language Models with flow-matching for waveform generation, first announced in April . It is in private beta. You can request access here .
On-device Text-To-Speech enables deployment scenarios that cloud APIs cannot serve: offline voice agents in vehicles and remote equipment, latency-sensitive products where a network round trip is unacceptable, privacy-sensitive applications in healthcare and consumer hardware where audio cannot leave the device, and high-volume applications where per-request API costs are prohibitive. Phonon runs entirely on the edge, removing the network from the voice pipeline.
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