What is Ghost Font, the anti-AI font touted to be legible only to humans?

American digital designer Eric Lu created Ghost Font, an experimental typeface that hides text inside animated videos made of moving dots.

In Ghost Font, dots forming each letter move in one direction while the rest move the opposite way, making the message readable to humans but difficult for AI models to interpret.

Lu tested Ghost Font with AI models including GPT-Sol 5.6 Ultra and Claude Fable, which failed to decode the hidden text and instead identified a decoy phrase.

One AI model spent nearly 20 minutes analyzing the clip before hallucinating and inventing a message that didn't exist.

Lu is looking to incorporate Ghost Font into CAPTCHA systems, as most current systems are easily solved by AI.