Fact · Transcription
20.5times the API file limit
The 512 MB ChatGPT audio upload limit is about 20.5 times the 25 MB file limit of OpenAI's transcription API.
Checked against its source on October 17, 2026
- What it measures
- The two limits belong to different products, a chat app and a developer API, so the ratio compares file size only.
- How it is calculated
- 512 MB / 25 MB = 20.5