OpenRouter

Fishaudio: S2 Pro

fishaudio/s2-pro
Context

4K

Input

text

Output

audio

Tool calling

Not listed

About this model

Fish Audio S2 Pro is an advanced 4B parameter open-weight text-to-speech model built on a dual-autoregressive architecture. It supports approximately 80 languages and introduces fine-grained, word-level inline tag control, allowing users to embed open-ended natural language instructions inside square brackets directly in the script (e.g., [whispering], [pitch up]). It outputs 44.1 kHz audio and natively supports zero-shot voice cloning from a reference clip.

Input modalities

text

Accepted as model input

Providers

Available routing options for this model through OneInfer.

Available

Text to speech

$15.000 / 1M characters

Routing

OneInfer optimized

Pricing

Current OneInfer pricing for this model.

UsagePrice
Text to speechTTS$15.000 / 1M characters

Performance & Benchmarks

Independent evaluations and live cluster operational metrics

We haven’t measured this model yet.

API Guide

API docs
  1. 1

    Generate your access token

    Use your API key to generate the JWT access token required by the Models API.

  2. 2

    Add the JWT token

    Copy the generated JWT token and replace JWT_TOKEN in the example below.

  3. 3

    Check your credits

    If your balance is too low, before calling the model.

  4. 4

    Run the API example

    Choose your preferred language, copy the example, and send your first model request.

    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-pro",
      "prompt": "OneInfer makes AI inference simple.",
      "stream": false,
      "voice_id": "English_expressive_narrator",
      "format": "mp3"
    }'

Community Model Reviews & Ratings

Verified visitor & developer evaluations on Fishaudio: S2 Pro's real-world intelligence, code accuracy, and speed

4.8
Community consensus rating
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