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Overview Models Agents Tools Audio & voice Production API reference

Speech

Turn audio into text or text into audio.

Create speech
POST
/audio/speech
Models
SpeechModel = "tts-1" or "tts-1-hd" or "gpt-4o-mini-tts" or "gpt-4o-mini-tts-2025-12-15"
One of the following:
"tts-1"
"tts-1-hd"
"gpt-4o-mini-tts"
"gpt-4o-mini-tts-2025-12-15"