Generate speech POST /v1/audio/speech
Returns audio bytes, not JSON.
Parameters / Responses
Parameters: input, instructions, model, response_format, speed, stream_format, voice
Responses: 2XX application/octet-stream, 2XX audio/*, 2XX audio/aac, 2XX audio/flac, 2XX audio/mpeg, 2XX audio/opus, 2XX audio/pcm, 2XX audio/wav, 2XX text/event-stream
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