How long will ChatGPT transcribe audio?

ChatGPT transcription length depends on the product surface you use.

Voice mode, Record mode, and the OpenAI API have different limits, and those limits can vary by plan, platform, file size, and current usage policies. In practice, ChatGPT is best for short voice conversations, quick notes, meetings, and recordings that you want to summarize or rewrite after transcription.

For uploaded files through a speech-to-text API, practical length is often controlled by file size, audio format, compression, and timeout limits rather than only by minutes. A clean 30-minute recording may transcribe in a few minutes with modern AI, but noisy audio, multiple speakers, long files, high server demand, or extra features such as speaker labeling can take longer.

If you need predictable long-form transcription for lectures, interviews, webinars, or archives, use a dedicated transcription workflow instead of relying only on the chat interface. Split very long audio into sections, keep the original audio quality high, and review the transcript before using it as an official record.