OpenAI.fm

OpenAI.fm is an interactive demo site for developers testing OpenAI’s latest speech synthesis models. It lets you hear, in real time, how your text sounds when rendered with different voices and speaking styles.

Voice and style testing

The page includes a showcase of voices such as Alloy, Ash, Ballad, Coral, Echo, Fable, Onyx, Nova, Sage, Shimmer, Verse, and others. Each voice has its own character, and VIBE modes (for example, Calm, Sincere, Sports Coach, Pirate, Connoisseur, and more) adjust tone and delivery. This makes it easier to match narration to a specific product or scenario.

Useful before API integration

OpenAI.fm helps you quickly evaluate how your content will sound before writing code. You can narrow down the right voice, style, and parameters, then move on to implementing the OpenAI API with fewer trial-and-error iterations.

Common use cases include:

• Voice assistants and conversational interfaces
• Narration and voiceover for content
• Training and educational materials
• Game characters and interactive experiences