4B-parameter multilingual TTS model achieves 70ms latency and zero-shot voice adaptation from 3-second samples, priced at $0.016/1k characters via API.
Summary
Replaces ElevenLabs for cost-sensitive voice agent deployments where latency matters; zero-shot cross-lingual voice adaptation enables speech-to-speech translation pipelines without separate retraining. Available now in API and open weights.
Why it matters
Replaces ElevenLabs for cost-sensitive voice agent deployments where latency matters; zero-shot cross-lingual voice adaptation enables speech-to-speech translation pipelines without separate retraining. Available now in API and open weights.
Implementation verdict
Production-ready. Integrates into existing STT+LLM stacks. Requires 3-5s voice sample for adaptation. Trade-off: human evaluation shows parity with ElevenLabs v3 quality but superior to v2.5 Flash on naturalness metrics. Worth adopting now for cost optimization if multilingual support needed; otherwise ElevenLabs remains faster iteration path.
Sources
Dev Signal
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