ChatGPT's New Watermark: A Cat and Mouse Game?
2025-04-21
Rumi's team discovered that newer GPT models (o3 and o4-mini) embed special character watermarks, primarily narrow no-break spaces, in longer generated texts. These are invisible to the naked eye but detectable with code editors or online tools. While potentially useful for detecting AI-generated content, they're easily removed. This might cause widespread attention among students, potentially leading OpenAI to remove the feature. Rumi advocates for a process-focused approach to student writing, emphasizing AI literacy over easily bypassed technical solutions.
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