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Build voice workflows with one SDK: transcribe audio, translate it to English, and synthesize speech.
Use openai/gpt-4o-transcribe for transcription and openai/gpt-4o-mini-tts for speech generation.

Speech to Text

Audio Translation

Text to Speech

API endpoints

Speech

POST /v1/audio/speech

Transcriptions

POST /v1/audio/transcriptions

Translations

POST /v1/audio/translations
Last modified on June 30, 2026