---
license: mit
tags:
  - mlx
  - 4bit
  - whisper
  - stt
  - metalrt
  - apple-silicon
---

# Whisper Medium — MLX 4-bit Quantized

Custom MLX 4-bit quantization of [OpenAI Whisper Medium](https://huggingface.co/openai/whisper-medium) optimized for [MetalRT](https://github.com/RunanywhereAI/metalrt-binaries) GPU inference on Apple Silicon.

## Usage

Used by [RCLI](https://github.com/RunanywhereAI/RCLI) with the MetalRT engine for speech-to-text:

```bash
rcli setup          # select MetalRT or Both engines
```

> **Note**: Whisper Medium is in GPU beta. Whisper Tiny is recommended for production use.

## Performance (Apple M3 Max)

| Metric | Value |
|--------|-------|
| Latency (1.2s audio) | 233 ms |
| RTF | 0.19x |
| Quantization | MLX 4-bit |

## License

Model weights: [MIT](https://github.com/openai/whisper/blob/main/LICENSE) (OpenAI)
MetalRT engine: [Proprietary](https://github.com/RunanywhereAI/metalrt-binaries/blob/main/LICENSE) (RunAnywhere, Inc.)

## Contact

founder@runanywhere.ai | https://runanywhere.ai