Fish Audio S2.1 Pro

AI audio generation model

What it's the best tool for

Emotion and delivery cues written inline: pauses, whisper, laughter
Multi-speaker dialogue in a single generation
80+ languages with automatic language detection
Zero-shot voice cloning from a short reference clip
Realtime streaming with fast time to first audio
Export to MP3, WAV, FLAC, and OGG

Limitations

When to reach for something else

Up to 3000 characters of text per generation
Voice cloning is single-speaker only
A library voice cannot be combined with a cloned reference
Dialogue mode requires at least two voices
Billing follows text volume, not audio duration

Sample output

How Fish Audio S2.1 Pro responds

Prompt

[calmly, with intrigue] We recorded this episode at night, after the studio had emptied out. [short pause] And here is what we heard. [warmer] Welcome to a podcast about sound.

NE Fish Audio S2.1 Pro

A finished single-voice audio track. The opening line is hushed and intriguing, then after the short pause the voice warms up and moves into the greeting — the delivery shifts exactly where the bracket cues sit. The bracket cues themselves are never spoken. The file comes back as MP3, WAV, FLAC, or OGG with normalized loudness.

Where teams use it

Four scenarios where it pays for itself

Podcasts and audiobooks

Lifelike narration of long scripts with pauses and emphasis

Dialogue and characters

Two-voice scenes in a single generation

Localization

One script voiced across dozens of languages

Your own voice

Clone a narrator from a short reference clip

About model

More about Fish Audio S2.1 Pro

Fish Audio S2.1 Pro — Text-to-Speech with Directed Delivery

Fish Audio S2.1 Pro is the flagship speech model from Fish Audio. You direct the performance inside the script itself: bracket cues such as [short pause], [whispering], or [laughs] tell the model how a line should land. It runs in the browser on NetRoom.

How it differs from plain TTS

Standard text-to-speech reads a script evenly from start to finish. Here you direct it: drop a pause before the point that matters, take the voice down to a whisper, add a laugh. Cues are written in plain language and are never spoken aloud — they only shape the delivery.

Dialogue and multiple voices

The model can build a multi-speaker scene in one generation. Lines are marked with speaker tags and each speaker gets its own voice from the library, so there is no manual track stitching afterwards.

Languages and voice cloning

More than 80 languages are supported, with automatic detection of the script's language — no settings to flip when you localize. Zero-shot voice cloning is available too: upload a short reference clip with its transcript and get synthesis in that voice. Cloning covers a single speaker.

How to voice a script

1. Sign up on NetRoom and top up your balance. 2. Open the Sound section and pick Fish Audio S2.1 Pro. 3. Paste the script, add bracket cues, and choose a voice. 4. Adjust speed and volume if needed. 5. Download the result as MP3, WAV, FLAC, or OGG.

Pricing

Pay as you go, no subscription — billing follows the volume of text you voice. The current rate is shown on this page, and you can estimate a project in the Sound section.

More in the Sound section

The widest ready-made voice library belongs to MiniMax Speech 2.8. For a compact expressive alternative see xAI TTS. Full sound scenes with effects come from Seed Audio 1.0, and songs with vocals from MiniMax Music 2.6.

Voice your first script — start on NetRoom.

Recent changes

What changed Fish Audio S2.1 Pro

SEP 07, 2026 + Added the Fish Audio S2.1 Pro voice model (Fish Audio): over 80 languages, multi-speaker dialogue and voice cloning from a single sample.

Full changelog →

Use Fish Audio S2.1 Pro via the API

The same engine, straight from your code: one key and one balance for text, images, video and sound. Pay only for the requests you make.

curl

curl https://netroom.ai/api/v1/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "fish-audio/fish-audio-s21-pro", "input": {"prompt": "A cinematic mountain sunrise"}}'

The model id is already in the example. The full parameter reference and prices live in GET /api/v1/models and in the docs.

API documentation Get an API key

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