Fact · Transcription
25MB
OpenAI's Transcriptions API accepts audio files up to 25 MB, and larger recordings must be compressed or split into chunks.
Checked against its source on October 16, 2026
In the source's own words
“The Transcriptions API accepts files up to 25 MB. For larger recordings, use a compressed audio format or split the file into chunks of 25 MB or less.”
Speech to text (OpenAI API guide), OpenAI, OpenAI, 2026, Longer inputs.
Open the original- What it measures
- The limit applies to one request to the API, not to the ChatGPT app.
- What it does not show
- Vendor limits change; this is the documentation as read on the date checked.
Source
Used to calculate
Cited on
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