---
title: "Did you know that some AI firms put invisible space characters in the…"
date: 2025-10-09
source: twitter
tweet_id: "1976298370869428536"
original_url: "https://x.com/i/web/status/1976298370869428536"
---

# Did you know that some AI firms put invisible space characters in the…

*October 9, 2025 · Twitter/X*

Did you know that some AI firms put invisible space characters in the output? And that these can be used to detect AI output? These spaces aren\'t normally rendered by browsers, and not visible to the human eye. But they can be detected by plaigarism checkers if you just copy...

![](img/2025-10-09-tw-001-img01.webp){style="max-width:100%; margin:1em 0"}