Shawn Wang posted on X that he ran A/B tests on thumbnails for the AI Engineer YouTube channel and chose to open source the results. The experiments compared thumbnails side by side over a period to identify what drove views. He published the findings on a public site so others could examine the pairs and draw their own conclusions. Stefania Druga replied to the post with praise for the approach. The announcement frames the release as an invitation for viewers to share their own thumbnail testing experiences or apply the observed patterns to their content.