Breeze TTS 2

audio_tokenizer/LICENSE · Apache-2.0 · Qwen/Qwen3-TTS-Tokenizer-12Hz

Apple M5 Pro · 48 GiB · TTFA / RTF / RSS

2026-10-24 · en · 8bit=3.20 s · bf16=3.68 s · seed=42 · CFG=4 · firstChunkFrames=3 · chunkFrames=25

MLXTTFA p50RTFRSS (GiB)Peak physical footprint (GiB)
8bit329 ms0.7073.948.22
bf16462 ms1.2586.0610.75

16 WAV · WER=0 · CER=0 · PCM SHA256=baseline · 10 E2E · Qwen3-ASR-0.6B-MLX-4bit

English/Chinese TTS with voice design, reference cloning and direction, and streamed audio (MLX BF16/8-bit, 24 kHz; research/non-commercial license).

BreezeTTS · 24,000 Hz · 16 × 2,048 · 80 ms · MLX BF16 / 8-bit

Usage

speech speak "The quick brown fox jumps over the lazy dog." --engine breeze \
  --instruct "A clear, calm English narrator." --stream -o design.wav

speech speak "The weather is beautiful today." --engine breeze \
  --voice-sample reference.wav --breeze-reference-text "Exact transcript." \
  --breeze-seed 42 -o clone.wav

speech speak "We need to discuss what happened." --engine breeze \
  --voice-sample reference.wav --breeze-reference-text "Exact transcript." \
  --instruct "Speak slowly, with a serious tone." --stream -o directed.wav

Swift API

import BreezeTTS

let model = try await BreezeTTSModel.fromPretrained()
let samples = try await model.generate(
    text: "The quick brown fox jumps over the lazy dog.",
    instruction: "A clear, calm English narrator.")

try await model.generateStreaming(text: "Hello, world!", instruction: "A warm voice.") { chunk in
    print(chunk.sampleRate, chunk.samples.count, chunk.isFinal)
}

Options

License

Derived from Breeze TTS 2 by BreezeBlue and licensed for research and non-commercial use only.

BreezeBlue Research and Non-Commercial License · Breeze TTS 2 MLX 8-bit · Breeze TTS 2 MLX BF16

Source and conversion

speech-swift / BreezeTTS · export_breeze_mlx.py · WER / CER / RSS / TTFA / RTF