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GPT-4o Audio

GPT-4o supports direct audio input processing and audio output generation for voice conversations.

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Audio Input

Send audio via the Chat Completions API: 
POST /v1/chat/completions

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Request Example

Python
import base64
from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://crazyrouter.com/v1"
)

# Read audio file and encode to Base64
with open("question.wav", "rb") as f:
    audio_base64 = base64.b64encode(f.read()).decode("utf-8")

response = client.chat.completions.create(
    model="gpt-4o-audio-preview",
    messages=[
        {
            "role": "user",
            "content": [
                {"type": "text", "text": "Please listen to this audio and answer the question"},
                {
                    "type": "input_audio",
                    "input_audio": {
                        "data": audio_base64,
                        "format": "wav"
                    }
                }
            ]
        }
    ]
)

print(response.choices[0].message.content)

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Audio Output

Request the model to respond in audio format:
Python
response = client.chat.completions.create(
    model="gpt-4o-audio-preview",
    modalities=["text", "audio"],
    audio={"voice": "nova", "format": "wav"},
    messages=[
        {"role": "user", "content": "Tell me a short joke"}
    ]
)

# Get text response
print(response.choices[0].message.content)

# Get audio response
if response.choices[0].message.audio:
    audio_data = base64.b64decode(response.choices[0].message.audio.data)
    with open("response.wav", "wb") as f:
        f.write(audio_data)

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Supported Models

ModelDescription
gpt-4o-audio-previewGPT-4o Audio Preview

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Audio Formats

Input supported: wav, mp3 Output supported: wav, mp3, opus, flac, pcm16
GPT-4o Audio can understand tone, emotion, and ambient sounds in audio — it goes beyond simple speech-to-text.