Models

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Current Model Catalog

Izwi accepts many legacy aliases (for example lowercase IDs), but the canonical IDs below match izwi list output.

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Text-to-Speech (TTS)

Kokoro-82M requires espeak-ng: macOS, Linux, Windows

Voxtral-4B-TTS-2603 includes bundled voice assets licensed under CC BY-NC 4.0 and supports 20 preset voices with 24 kHz output.

VibeVoice-1.5B is a Microsoft long-form TTS model with reference-voice cloning. It uses saved or direct reference voices rather than built-in speaker presets.

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Speech Recognition (ASR)

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Diarization and Alignment

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Chat

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Currently Disabled (Not Listed by izwi list)

• Legacy Qwen3 chat IDs: Qwen3-0.6B, Qwen3-0.6B-4bit, Qwen3-1.7B, Qwen3-1.7B-4bit
• Qwen3-14B-GGUF
• Gemma-3-4b-it
• TTS 8-bit and BF16 metadata variants such as Qwen3-TTS-12Hz-0.6B-Base-8bit and Qwen3-TTS-12Hz-1.7B-VoiceDesign-bf16; selected 4-bit variants are the standard low-memory downloads exposed by izwi list.

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Downloading Models

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Via CLI

# List enabled catalog models
izwi list

# Download a model
izwi pull Qwen3-TTS-12Hz-0.6B-Base

# Download an ASR model
izwi pull Qwen3-ASR-0.6B-GGUF

# Download NVIDIA Nemotron 3.5 ASR
izwi pull Nemotron-3.5-ASR-Streaming-0.6B

# Download IBM Granite Speech rich ASR
izwi pull Granite-Speech-4.1-2B-Plus

# Download Microsoft VibeVoice models
izwi pull VibeVoice-1.5B
izwi pull VibeVoice-ASR

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Via Web UI

1. Open http://localhost:8080
2. Go to Models in the sidebar
3. Click Download on a model

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Managing Models

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View Downloaded Models

izwi list --local

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Get Model Information

izwi models info Qwen3-TTS-12Hz-0.6B-Base

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Load a Model into Memory

izwi models load Qwen3-TTS-12Hz-0.6B-Base

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Unload a Model

izwi models unload Qwen3-TTS-12Hz-0.6B-Base

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Delete a Model

izwi rm Qwen3-TTS-12Hz-0.6B-Base

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Model Storage

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Custom Model Directory

# CLI flag
izwi serve --models-dir /path/to/models

# Environment variable
export IZWI_MODELS_DIR=/path/to/models
izwi serve

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Manual Downloads

• Manual Download: Gemma 3 1B
• Manual Download Guide

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Model Status

izwi status --detailed

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Quantization Notes

• -4bit / -8bit / -bf16 are reduced-precision variants.
• -GGUF variants are quantized GGUF artifacts.
• Smaller/quantized variants reduce memory and disk use at some quality/accuracy tradeoff.
• izwi list shows enabled variants only. Some catalog metadata exists for experimental 8-bit/BF16 TTS artifacts, but the standard downloadable low-memory TTS variants are the explicit -4bit entries shown above.

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Next Steps

• Manual Model Downloads
• Model Management
• Voice Presets
• CLI Reference
• Troubleshooting