OpenAI
Voice Engine
What OpenAI says Voice Engine puts into the files it makes, by file type, quoted from OpenAI's own pages. Covers audio from Voice Engine, which OpenAI described in 2024 as a limited research preview.
At a glance
| File type | Content Credentials | Invisible watermark | AI label in metadata | Visible mark | Tool named in metadata |
|---|---|---|---|---|---|
| Audio | Not stated | Yes, in 2024 | Not stated | Not stated | Not stated |
Audio
- Content CredentialsA signed record (C2PA) of how the file was made, sealed so any change shows.
Not stated. None of OpenAI's pages listed under Sources read says so.
- Invisible watermarkA signal woven into the pixels, frames, audio or wording, meant to survive copying.
In May 2024 OpenAI said it had incorporated audio watermarking into Voice Engine, then in a limited research preview.
OpenAI did not name the watermark.
Understanding the source of what we see and hear online
Quoted passage What we are building: new tools to identify content created by our services
In addition, we’ve also incorporated audio watermarking into Voice Engine, our custom voice model, which is currently in a limited research preview.
- AI label in metadataA plain metadata field (IPTC Digital Source Type) saying AI made the content. Anyone can add or remove it.
Not stated. None of OpenAI's pages listed under Sources read says so.
- Visible markA mark you can see, such as a logo or a sparkle in a corner.
Not stated. None of OpenAI's pages listed under Sources read says so.
- Tool named in metadataThe tool or model written into ordinary file fields, such as Software or Creator.
Not stated. None of OpenAI's pages listed under Sources read says so.
Limits and detection
- Checking tool from the makerA way the maker offers to check a file for its traces.
Not stated. None of OpenAI's pages listed under Sources read says so.
Sources read
Each page below was read and the quoted passage found on it. Last verified October 19, 2026.
- Provenance signals in OpenAI-generated contentOpenAI (OpenAI Help Center)
- Verify OpenAI-generated contentOpenAI
- Content provenance (OpenAI API guide)OpenAI (OpenAI API docs)
- Advancing content provenance for a safer, more transparent AI ecosystemOpenAI
- Understanding the source of what we see and hear onlineOpenAI
- Our approach to EU text provenance rulesOpenAI
- Launching Sora responsiblyOpenAI
- Sora 2 System Card: Provenance and Transparency InitiativesOpenAI (Deployment Safety Hub)
- What to know about the Sora discontinuationOpenAI (OpenAI Help Center)
- Introducing 4o Image GenerationOpenAI
- Deprecations (OpenAI API)OpenAI (OpenAI API docs)
- Creating and editing documents, spreadsheets, and presentations with ChatGPT WorkOpenAI (OpenAI Help Center)
- Images in ChatGPTOpenAI (OpenAI Help Center)
- Image generation (OpenAI API guide)OpenAI (OpenAI API docs)
- Text to speech (OpenAI API guide)OpenAI (OpenAI API docs)
- Video generation with Sora (OpenAI API guide)OpenAI (OpenAI API docs)