ZONOS2: real-time TTS with 8B params, 900M active, and high-fidelity voice cloning

In three linesZyphra releases ZONOS2, an open-source TTS model (Apache 2.0) with 8B parameters and 900M active at inference. Sparse MoE focused on zero-shot high-fidelity voice cloning (44.1 kHz DAC). Prosody score 88.7, outperforming Qwen 3 TTS (87.6) and ElevenLabs V3 (83.2). Trained on 6M+ audio hours, reads raw UTF-8 without phonemizer.

Summary generated by Claude — human-verified