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Open-weight model · Text to speech

s2-pro

by Fish Audio fishaudio/s2-pro

Fish Audio S2 Pro is a leading text-to-speech (TTS) model with fine-grained inline control of prosody and emotion.

Parameters4.6B
Context
Weights11.0 GB
Licenseother
AccessOpen weights
Monthly Downloads95.3k

Runs On

What it takes to serve s2-pro (4.6B 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 9.1 GB 10.9 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
8-bit 4.6 GB 5.5 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
4-bit 2.3 GB 2.7 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

Fish Audio S2 Pro is a leading text-to-speech (TTS) model with fine-grained inline control of prosody and emotion. Trained on over 10M+ hours of audio data across 80+ languages, the system combines reinforcement learning alignment with a dual-autoregressive architecture. The release includes model weights, fine-tuning code, and an SGLang-based streaming inference engine. S2 Pro builds on a decoder-only transformer combined with an RVQ-based audio codec (10 codebooks, ~21 Hz frame rate) using a Dual-Autoregressive (Dual-AR) architecture: - Slow AR (4B parameters): Operates along the time axis and predicts the primary semantic codebook. - Fast AR (400M parameters): Generates the remaining 9…

Excerpt from the card by Fish Audio, licensed other.

Configuration

Feed-forward size
9,728
Head dimension
128
Vocabulary size
155,776
Experts
1
Experts active per token
1
Model type
fish_qwen3_omni

Identity and Version

Repository
fishaudio/s2-pro
Publisher
Fish Audio
Task
Text to speech
Modality
Audio
Library
Not stated by the source
Parameters
4.6B parameters
Languages
zh, en, ja, ko, es, pt, ar, ru
Revision
1de9996b6be38b745688de084d87a5633f714e4e
First published
2026-03-09
Last updated
2026-03-11

Files and Weights

13 files, 11.0 GB in total. The weights are 3 files totalling 11.0 GB in pth, safetensors.

Weights3 files · 11.0 GB
Configuration3 files · 136.4 KB
Tokenizer2 files · 13.1 MB
Documentation2 files · 15.5 KB
Other2 files · 3.5 MB
Repository1 file · 1.6 KB
Every file
FileTypeSizeSHA-256
codec.pthWeights1.9 GB 74fc41c5a715
model-00001-of-00002.safetensorsWeights5.0 GB c4218e8ac93b
model-00002-of-00002.safetensorsWeights4.1 GB 76738d23465d
config.jsonConfiguration1.9 KB
model.safetensors.index.jsonConfiguration32.7 KB
special_tokens_map.jsonConfiguration101.9 KB
LICENSE.mdDocumentation10.4 KB
README.mdDocumentation5.1 KB
chat_template.jinjaOther4.1 KB
overview.pngOther3.5 MB f77da18e7d3c
.gitattributesRepository1.6 KB
tokenizer.jsonTokenizer12.2 MB f24e08099d45
tokenizer_config.jsonTokenizer860.8 KB

License and Download

License
other
Access
Open weights, no gate
Download size
11.0 GB
Download from Fish Audio

Released by Fish Audio through its official repository on Hugging Face.

Built From

  • Described by arXiv:2603.08823

Memory Requirements

PrecisionWeights in memory
As published11.0 GB
16-bit9.1 GB
8-bit4.6 GB
4-bit2.3 GB

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

Questions About s2-pro

How much GPU memory does s2-pro need?

About 10.9 GB at 16-bit and 2.7 GB at 4-bit: the weights (4.6B parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run s2-pro 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 s2-pro released under?

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

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