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TTS-1 HD

TTS-1 HD is the quality-optimized variant of OpenAI's text-to-speech family, generating more polished, natural-sounding audio than tts-1 for narration and produced content.

Speech
index.ts
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('openai/tts-1-hd'),
text: 'Hello from the Vercel AI Gateway!',
voice: 'alloy',
});
await writeFile('speech.mp3', result.audio.uint8Array);

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