GPT-4o Audio Preview
GPT-4o Audio Preview extends the GPT-4o multimodal architecture with native audio input and output — meaning the model processes spoken language directly rather than routing through a separate speech-to-text step. This enables lower latency, better prosody awareness, and the ability to detect tone, emotion, and speaker intent from raw audio.
OpenAI released it as a preview to allow developers to explore voice-native applications: conversational voice agents, real-time call analysis, spoken language tutoring, and accessibility tools. Output audio can carry expressive qualities not achievable via text-to-speech post-processing, making interactions feel distinctly more natural than pipeline-based voice solutions.
Key Features
Native audio input — processes speech directly without a separate ASR layer
Native audio output with expressive prosody and natural intonation
Lower end-to-end latency than text-mediated speech pipelines
Tone and emotion detection from spoken input
Multilingual spoken language understanding and response
Combined text and audio modality in a single model call
Ideal Use Cases
Real-time voice assistants and conversational IVR replacements
Spoken language tutoring with pronunciation feedback
Call center analytics detecting sentiment from live audio
Accessibility tools for visually impaired users requiring audio I/O
Voice-driven agentic workflows integrated with tool use
Example Prompts for GPT-4o Audio Preview
Technical Specifications
| Provider | OpenAI |
| Category | Audio |
| Modality | Audio -> Text or Audio -> Audio |
Frequently Asked Questions
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