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Fish S2 Pro

Preview
Fish AudioAll Fish Audio models

Per 1K chars

$0.015

USD / 1K chars

Per 1M chars

$15.00

USD / 1M chars

Released

2026-03-09

Positioning: Flagship. Price level 2 of 4 among audio models.

Fish Audio S2 Pro is Fish Audio's openly released text-to-speech model, trained on more than 10 million hours of audio across 80+ languages. Free-form inline tags such as [whisper] or [excited] steer emotion and prosody word by word, and it handles multi-speaker, multi-turn dialogue. Fish Audio now lists it as its previous-generation S2 model, succeeded by S2.1-Pro.

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Pricing

Pay for what you use: credits are deducted only when a request succeeds.
Prices in USD · $1 = 100 credits
Per 1K chars
$0.015
Per 1M chars
$15.000
USD / 1K chars

Text-to-speech (Fish Audio), billed at USD 15 per 1M characters.

Where it fits

Good fit
  • Expressive narration and character voices steered with inline emotion tags
  • Multi-speaker dialogue such as podcast-style or drama scripts
  • Multilingual voiceover across Chinese, English, Japanese and dozens of other languages
  • Budgets that track script length, since ATP bills per input character
Usually not ideal
  • Speech recognition or audio understanding — this id is text-to-speech only
  • Commercial self-hosting of the open weights — they ship under a research, non-commercial license

Benchmarks

Vendor-reported
  • Seed-TTS Eval WER (English)0.99% WER

    lower is better; 'best overall' per vendor

    Fish Audio
  • Seed-TTS Eval WER (Chinese)0.54% WER

    lower is better; 'best overall' per vendor

    Fish Audio
  • EmergentTTS-Eval win rate81.88%

    win rate vs gpt-4o-mini-tts baseline

    Fish Audio

Scores as published by each vendor, not measured by ATP. Test conditions vary, so they are not directly comparable across vendors.

Same controls on every model: project keys, per-project model access, credit budgets, and a log of every request.Set up your organization

Cost estimator

Plug in your usage to see roughly what a month costs.
010,000
ESTIMATE
$7.50
USD / month
750 credits / month
  • Characters$7.50

$7.50 USD / month · 750 credits / month

An estimate at our USD prices (USD 1 = 100 credits). What each request actually cost shows up in your console's request log.

Quickstart

Check that your key can see this model id, then follow the docs. Read the docs
models.sh · curl
curl -s https://api.atptoken.ai/v1/models \
  -H "Authorization: Bearer atp-•••"

# data[].id: "fish-s2-pro"

FAQ

3
What can I send Fish S2 Pro, and what do I get back?
Fish S2 Pro is a Fish Audio text-to-speech model. Send the text to speak and you get back speech audio.
How is Fish S2 Pro priced?
You pay per 1,000 characters of text you send. You only pay when a request succeeds. $1 = 100 credits. See pricing
How do I call Fish S2 Pro on ATP?
Create a project API key. Check that "fish-s2-pro" shows up with GET https://api.atptoken.ai/v1/models, then follow the speech generation docs with model set to that id.

Sources

The model description on this page cites these sources. Prices come from ATP.
Get started

Start with $5. Credits never expire.

Create a project key, turn this model on, and pay only for what you use.

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