OpenAI is reportedly testing the addition of watermarks to images generated by users of its free ChatGPT account. This initiative, discovered through an APK teardown and sources, aims to differentiate images created by free users from those produced by paid subscribers, who may be able to download watermark-free images. The feature is powered by the GPT-4o model. The potential implementation of watermarks comes amid a surge in popularity of AI-generated images, particularly those mimicking the style of Studio Ghibli, a trend referred to as the Ghibli AI trend. This trend has led to widespread sharing of such images across social media platforms, prompting concerns about the authenticity and origin of AI-generated content. OpenAI CEO Sam Altman has not officially confirmed the rollout of this feature, leaving uncertainty about whether it will be implemented. The move is seen as a strategy to encourage more users to opt for paid subscriptions to access images without watermarks.