Fishaudio: S2.1 Pro

fishaudio/s2.1-pro

Context

Input

text

Output

audio

Tool calling

Not listed

About this model

Fish Audio S2.1 Pro is a state-of-the-art production-grade neural speech synthesis model optimized for ultra-low latency. With a Time-to-First-Audio (TTFA) as low as ~70-90ms, it is built for live conversational AI and turn-taking dialogue systems. It natively supports 83 languages without separate endpoints, features high-consistency voice cloning from reference audio, and excels at natural prosody for long-form narration.

Compare Text-to-Speech Models Compare Audio Models

Input modalities

text

Accepted as model input

Providers

Available routing options for this model through OneInfer.

openrouter

Available

Text to speech

$15.000 / 1M characters

Routing

OneInfer optimized

Pricing

Current OneInfer pricing for this model.

Usage	Price
Text to speechTTS	$15.000 / 1M characters

Performance

Published evaluation results associated with this model.

No benchmark data is listed for this model.

API example

Refer Documentation

curl -X POST https://api.oneinfer.ai/v1/ula/generate-audio \
  -H "Authorization: Bearer YOUR_JWT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
  "provider": "openrouter",
  "model": "fishaudio/s2.1-pro",
  "prompt": "OneInfer makes AI inference simple.",
  "stream": false,
  "voice_id": "English_expressive_narrator",
  "format": "mp3"
}'