ChatGPT's voice now carries an invisible watermark — and anyone can check for it
As of July 31, audio generated with GPT-Live through ChatGPT Voice and the OpenAI API carries SynthID, the invisible watermark technology developed by Google DeepMind, embedded in the sound itself so it survives compression and editing. OpenAI's public verification tool now detects provenance signals in audio as well as images, and a new verification API lets companies build the check into their own products. It extends the C2PA-plus-SynthID stack OpenAI adopted for images in May.
Why it mattersAI-cloned voices are the deepfake variety people fall for most — in scam calls there is no picture to squint at. A watermark standard shared across rivals (Google's technology inside OpenAI's products), plus verification as an API, means banks, newsrooms and courts can start automatically asking: was this voice made by a machine?
▶ Related video: OpenAI expands AI content verification with SynthID and provenance tools | Next in AI | Astha La Vista
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