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Open-weight model · Text to speech

higgs-tts-3-4b

by Boson AI bosonai/higgs-tts-3-4b

Higgs TTS 3 is built for voice chat: it speaks, not just reads. It turns model responses into expressive conversational speech across 100+ languages, with zero-shot voice cloning and inline control over emotion, style, prosody, pauses, and sound effects.

Parameters4.7B
Context32,768
Weights9.3 GB
Licenseother
AccessOpen weights
Monthly Downloads103.1k

Runs On

What it takes to serve higgs-tts-3-4b (4.7B parameters): the memory its weights need at each precision, and the cheapest way to rent enough data-center GPUs to hold them.

PrecisionWeightsMemory neededCheapest setupPer hourAlso fits
16-bit 9.3 GB 11.2 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
8-bit 4.7 GB 5.6 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
4-bit 2.3 GB 2.8 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00

Memory is the weights at that precision plus 20% for the runtime and a short context; a long context needs more. Prices are the lowest on-demand hourly rates in the SAVRN Index, read Sep 18, 2026.

Model Card

Higgs TTS 3 is built for voice chat: it speaks, not just reads. It turns model responses into expressive conversational speech across 100+ languages, with zero-shot voice cloning and inline control over emotion, style, prosody, pauses, and sound effects. Higgs autoregressive decoder consumes interleaved text and audio tokens. Audio is encoded by the Higgs Tokenizer into 8 codebooks at 25 fps, staggered via a delay pattern, then mapped to backbone hidden states through a multi-codebook fused embedding. Output codes pass through a multi-codebook fused head, are de-delayed, and decoded back to waveform. The model reaches single-digit WER/CER on 102 languages, which split into · Chichewa/Nyanja…

Excerpt from the card by Boson AI, licensed other.

Configuration

Architecture
HiggsMultimodalQwen3ForConditionalGeneration
Context length (tokens)
32,768
Layers
36
Hidden size
2,560
Feed-forward size
9,728
Attention heads
32
Key/value heads
8
Head dimension
128
Vocabulary size
151,936
Model type
higgs_multimodal_qwen3

Identity and Version

Repository
bosonai/higgs-tts-3-4b
Publisher
Boson AI
Task
Text to speech
Modality
Audio
Library
transformers
Parameters
4.7B parameters
Languages
af, ar, as, ast, az, ba, be, bg
Revision
239f63fb7b02b1aa085f98d9efae5e35cc5523e8
First published
2026-06-04
Last updated
2026-09-04

Files and Weights

12 files, 9.3 GB in total. The weights are 1 file totalling 9.3 GB in safetensors.

Weights1 file · 9.3 GB
Configuration2 files · 92.9 KB
Tokenizer2 files · 11.4 MB
Documentation4 files · 90.8 KB
Other2 files · 65.5 KB
Repository1 file · 1.6 KB
Every file
FileTypeSizeSHA-256
model.safetensorsWeights9.3 GB 2f7965264c36
config.jsonConfiguration2.8 KB
model.safetensors.index.jsonConfiguration90.1 KB
AGENTS.mdDocumentation9.5 KB
LICENSEDocumentation32.2 KB
PROMPTING.mdDocumentation2.8 KB
README.mdDocumentation46.3 KB
assets/model_architecture.pngOther63.1 KB
chat_template.jinjaOther2.4 KB
.gitattributesRepository1.6 KB
tokenizer.jsonTokenizer11.4 MB eb883de2de5a
tokenizer_config.jsonTokenizer1.9 KB

License and Download

License
other
Access
Open weights, no gate
Download size
9.3 GB
Download from Boson AI

Released by Boson AI through its official repository on Hugging Face.

Memory Requirements

PrecisionWeights in memory
As published9.3 GB
16-bit9.3 GB
8-bit4.7 GB
4-bit2.3 GB

Weights only, from the published parameter count; the key-value cache and runtime add to this.

Built on This Model

Questions About higgs-tts-3-4b

How much GPU memory does higgs-tts-3-4b need?

About 11.2 GB at 16-bit and 2.8 GB at 4-bit: the weights (4.7B parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run higgs-tts-3-4b on?

At 16-bit, 1x MI300X from $1.85 an hour; at 4-bit, 1x MI300X from $1.85 an hour, at the lowest on-demand prices the SAVRN Index lists.

What license is higgs-tts-3-4b released under?

other, as its publisher declares it. Read the license text before commercial use.

What is higgs-tts-3-4b's context length?

32,768 tokens, from the maximum position embeddings in its published configuration.

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