S1 (Free)

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import { experimental_generateSpeech as generateSpeech } from 'ai';
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import { gateway } from '@ai-sdk/gateway';
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import { writeFile } from 'node:fs/promises';
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const result = await generateSpeech({
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  model: gateway.speechModel('fish-audio/s1-free'),
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  text: 'Hello from the Vercel AI Gateway!',
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  // Browse voices at https://fish.audio/app/discovery
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  // Open a voice, then use "Copy Model Id" in its "..." menu.
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  voice: '933563129e564b19a115bedd57b7406a',
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});
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await writeFile('speech.mp3', result.audio.uint8Array);