The TTS endpoint provides 11 built‑in voices to control how speech is rendered from text. Hear and play with these voices in OpenAI.fm, our interactive demo for trying the latest text-to-speech model in the OpenAI API. The TTS endpoint provides 11 built‑in voices to control how speech is rendered from text. Hear and play with these voices in OpenAI.fm, our interactive demo for trying the latest text-to-speech model in the OpenAI API. Turn Text into Lifelike Speech with Free AI OpenAI FM Transform your text into natural-sounding audio using GPT-4o mini TTS. Powered by OpenAI's cutting-edge Text-to-Speech technology, enjoy dozens of vocal styles, seamless multilingual support, and instant streaming-quality audio. Perfect for podcasts, videos, e-learning, or creative projects! For the first time, developers can also instruct the text-to-speech model to speak in a specific way—for example, “talk like a sympathetic customer service agent”—unlocking a new level of customization for voice agents.

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