API Reference

Audio

Transcriptions

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Create transcription

client.Audio.Transcriptions.New(ctx, body) (*AudioTranscriptionNewResponseUnion, error)

POST/audio/transcriptions

Transcribes audio into the input language.

Returns a transcription object in json, diarized_json, or verbose_json format, or a stream of transcript events.

ParametersExpand Collapse

body AudioTranscriptionNewParams

File param.Field[Reader]

The audio file object (not file name) to transcribe, in one of these formats: flac, mp3, mp4, mpeg, mpga, m4a, ogg, wav, or webm. The request must include enough format metadata for the file to be identified. We recommend an extension-bearing filename and an appropriate content type.

Model param.Field[AudioModel]

ID of the model to use. The options are gpt-transcribe, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-mini-transcribe-2025-12-15, whisper-1 (which is powered by our open source Whisper V2 model), and gpt-4o-transcribe-diarize.

ChunkingStrategy param.Field[AudioTranscriptionNewParamsChunkingStrategyUnion]Optional

Controls how the audio is cut into chunks. When set to "auto", the server first normalizes loudness and then uses voice activity detection (VAD) to choose boundaries. server_vad object can be provided to tweak VAD detection parameters manually. If unset, the audio is transcribed as a single block. Required when using gpt-4o-transcribe-diarize for inputs longer than 30 seconds.

Include param.Field[[]TranscriptionInclude]Optional

Additional information to include in the transcription response. logprobs will return the log probabilities of the tokens in the response to understand the model’s confidence in the transcription. logprobs only works with response_format set to json and only with the models gpt-4o-transcribe, gpt-4o-mini-transcribe, and gpt-4o-mini-transcribe-2025-12-15. This field is not supported when using gpt-4o-transcribe-diarize.

Keywords param.Field[[]string]Optional

Words or phrases to guide transcription of the input audio. Supported by gpt-transcribe.

KnownSpeakerNames param.Field[[]string]Optional

Optional list of speaker names that correspond to the audio samples provided in known_speaker_references[]. Each entry should be a short identifier (for example customer or agent). Up to 4 speakers are supported.

KnownSpeakerReferences param.Field[[]string]Optional

Optional list of audio samples (as data URLs) that contain known speaker references matching known_speaker_names[]. Each sample must be between 2 and 10 seconds, and can use any of the same input audio formats supported by file.

Language param.Field[string]Optional

The language of the input audio. Supplying the input language in ISO-639-1 (e.g. en) format will improve accuracy and latency.

Languages param.Field[[]string]Optional

Possible languages of the input audio, in ISO-639-1 format. Supported by gpt-transcribe.

Prompt param.Field[string]Optional

An optional text to guide the model’s style or continue a previous audio segment. The prompt should match the audio language. This field is not supported when using gpt-4o-transcribe-diarize.

ResponseFormat param.Field[AudioResponseFormat]Optional

The format of the output, in one of these options: json, text, srt, verbose_json, vtt, or diarized_json. For gpt-4o-transcribe and gpt-4o-mini-transcribe, the only supported format is json. For gpt-4o-transcribe-diarize, the supported formats are json, text, and diarized_json, with diarized_json required to receive speaker annotations.

Temperature param.Field[float64]Optional

The sampling temperature, between 0 and 1. Higher values like 0.8 will make the output more random, while lower values like 0.2 will make it more focused and deterministic. If set to 0, the model will use log probability to automatically increase the temperature until certain thresholds are hit.

TimestampGranularities param.Field[[]string]Optional

The timestamp granularities to populate for this transcription. response_format must be set verbose_json to use timestamp granularities. Either or both of these options are supported: word, or segment. Note: There is no additional latency for segment timestamps, but generating word timestamps incurs additional latency. This option is not available for gpt-4o-transcribe-diarize.

ReturnsExpand Collapse

type AudioTranscriptionNewResponseUnion interface{…}

Represents a transcription response returned by model, based on the provided input.

One of the following:

type Transcription struct{…}

Represents a transcription response returned by model, based on the provided input.

type TranscriptionVerbose struct{…}

Represents a verbose json transcription response returned by model, based on the provided input.

Create transcription

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Java

CLI Tool

package main

import (
  "bytes"
  "context"
  "fmt"
  "io"

  "github.com/openai/openai-go"
  "github.com/openai/openai-go/option"
)

func main() {
  client := openai.NewClient(
    option.WithAPIKey("My API Key"),
  )
  transcription, err := client.Audio.Transcriptions.New(context.TODO(), openai.AudioTranscriptionNewParams{
    File: io.Reader(bytes.NewBuffer([]byte("Example data"))),
    Model: openai.AudioModelGPT4oTranscribe,
  })
  if err != nil {
    panic(err.Error())
  }
  fmt.Printf("%+v\n", transcription)
}

{
  "text": "Imagine the wildest idea that you've ever had, and you're curious about how it might scale to something that's a 100, a 1,000 times bigger. This is a place where you can get to do that.",
  "usage": {
    "type": "tokens",
    "input_tokens": 14,
    "input_token_details": {
      "text_tokens": 0,
      "audio_tokens": 14
    },
    "output_tokens": 45,
    "total_tokens": 59
  }
}

Returns Examples

{
  "text": "Imagine the wildest idea that you've ever had, and you're curious about how it might scale to something that's a 100, a 1,000 times bigger. This is a place where you can get to do that.",
  "usage": {
    "type": "tokens",
    "input_tokens": 14,
    "input_token_details": {
      "text_tokens": 0,
      "audio_tokens": 14
    },
    "output_tokens": 45,
    "total_tokens": 59
  }
}