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.
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);Playground
Try out S2.1 Pro by Fish Audio. Usage is billed to your team at API rates. Free users (those who haven't made a payment) get $5 of credits every 30 days.
S2.1 Pro
Your generated audio will appear here
Providers
Route requests across multiple providers. Copy a provider slug to set your preference. Visit the docs for more info. Using a provider means you agree to their terms, listed under Legal.
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$15/M chars | — | | 10/20/2025 |