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Fish Audio

S2.1 Pro

S2.1 Pro is Fish Audio's current state-of-the-art voice model — the best model we have, now available to every developer for free via API. It is a neural speech synthesis model designed for production-grade AI voice generation, with particular strengths in low-latency streaming, multilingual TTS, and voice cloning. Your use is subject to Fish Audio's Terms & Privacy Policies.

Use with AI GatewayView docs
import { experimental_generateSpeech as generateSpeech } from 'ai';
import { gateway } from '@ai-sdk/gateway';
import { writeFile } from 'node:fs/promises';


const result = await generateSpeech({
  model: gateway.speechModel('fish-audio/s2.1-pro'),
  text: 'Hello from the Vercel AI Gateway!',
  // Browse voices at https://fish.audio/app/discovery
  // Open a voice, then use "Copy Model Id" in its "..." menu.
  voice: '933563129e564b19a115bedd57b7406a',
});


await writeFile('speech.mp3', result.audio.uint8Array);
Read docs
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Provider
Input
Capabilities
ZDR
No Training
Release Date
Fish Audio
Legal:Terms•Privacy
$15/M chars
07/28/2026