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Open-weight model · Text to speech

higgs-tts-2-3b-base

by Boson AI bosonai/higgs-tts-2-3b-base

Check our open-source repository https://github.com/boson-ai/higgs-audio for more details! We are open-sourcing Higgs TTS 2, a powerful audio foundation model pretrained on over 10 million hours of audio data and a diverse set of text data.

Parameters5.8B
Context2,048
Weights11.5 GB
Licenseother
AccessOpen weights
Monthly Downloads311k

Runs On

What it takes to serve higgs-tts-2-3b-base (5.8B 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 11.5 GB 13.9 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
8-bit 5.8 GB 6.9 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
4-bit 2.9 GB 3.5 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

Check our open-source repository https://github.com/boson-ai/higgs-audio for more details! We are open-sourcing Higgs TTS 2, a powerful audio foundation model pretrained on over 10 million hours of audio data and a diverse set of text data. Despite having no post-training or fine-tuning, Higgs TTS 2 excels in expressive audio generation, thanks to its deep language and acoustic understanding. On EmergentTTS-Eval, the model achieves win rates of 75.7% and 55.7% over "gpt-4o-mini-tts" on the "Emotions" and "Questions" categories, respectively. It also obtains state-of-the-art performance on traditional TTS benchmarks like Seed-TTS Eval and Emotional Speech Dataset (ESD). Moreover, the model…

Excerpt from the card by Boson AI, licensed other.

Configuration

Architecture
HiggsAudioV2ForConditionalGeneration
Context length (tokens)
2,048
Layers
28
Hidden size
3,072
Feed-forward size
8,192
Attention heads
24
Key/value heads
8
Head dimension
128
Vocabulary size
128,256
Model type
higgs_audio_v2

Identity and Version

Repository
bosonai/higgs-tts-2-3b-base
Publisher
Boson AI
Task
Text to speech
Modality
Audio
Library
transformers
Parameters
5.8B parameters
Languages
en, zh, de, ko
Revision
d80c511612b3040ff2877ce3d408747df1739f11
First published
2025-07-01
Last updated
2026-06-25

Files and Weights

16 files, 11.6 GB in total. The weights are 1 file totalling 11.5 GB in safetensors.

Weights1 file · 11.5 GB
Configuration4 files · 2.4 KB
Tokenizer3 files · 17.3 MB
Documentation2 files · 35.0 KB
Other5 files · 15.3 MB
Repository1 file · 2.1 KB
Every file
FileTypeSizeSHA-256
model.safetensorsWeights11.5 GB 9c896b019ec1
config.jsonConfiguration1.1 KB
generation_config.jsonConfiguration351 B
processor_config.jsonConfiguration682 B
special_tokens_map.jsonConfiguration301 B
LICENSEDocumentation9.2 KB
README.mdDocumentation25.8 KB
chat_template.jinjaOther3.0 KB
emergent-tts-emotions-win-rate.pngOther838.0 KB 63bc6a63f3e3
higgs_audio_v2_architecture_combined.pngOther438.3 KB 6260cd2e9823
higgs_audio_v2_open_source_delay_pattern.pngOther33.0 KB
open_source_repo_demo.mp4Other14.0 MB 6dd765d355ff
.gitattributesRepository2.1 KB
higgs_audio_tokenizer_architecture.pngTokenizer117.2 KB f7c0177e38dd
tokenizer.jsonTokenizer17.2 MB 1a222563314b
tokenizer_config.jsonTokenizer405 B

License and Download

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

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

Built From

  • Described by arXiv:2505.23009

Memory Requirements

PrecisionWeights in memory
As published11.5 GB
16-bit11.5 GB
8-bit5.8 GB
4-bit2.9 GB

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

Questions About higgs-tts-2-3b-base

How much GPU memory does higgs-tts-2-3b-base need?

About 13.9 GB at 16-bit and 3.5 GB at 4-bit: the weights (5.8B parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run higgs-tts-2-3b-base 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-2-3b-base released under?

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

What is higgs-tts-2-3b-base's context length?

2,048 tokens, from the maximum position embeddings in its published configuration.

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