Gepard : 0.6B streaming TTS built for real-time dialogue - 20× realtime factor, ~50ms time-to-first-audio, vLLM-native, Apache 2.0

Gepard 1.0 is a 555M parameter streaming TTS model using a Qwen3.5 0.8B backbone and Nemo NanoCodec for frame-by-frame generation. It achieves a 20x real-time factor and 50ms time-to-first-audio on an RTX 5090, supporting up to 256 parallel sequences via vLLM integration. The model provides zero-shot voice cloning and a 4.25 NISQA-MOS score.