Claude Fable 5.1 can generate SVG images. It hides messages in images by encoding letters as visual attributes. Height encoding was the most common method. Night skylines were the most frequent scene used. A separate Fable instance could decode 49 of 50 messages. One encoding family used UTF-8 fill colors and failed to decode. The model measured element heights and gaps to recover messages. It used Python and PIL to analyze pixel data. The stars in one image encoded the message 'The monster acts on the moonshine module'.

• 50 messages tested
• 33 of 50 used height encoding
• 23 of 50 used night skyline
• 49 of 50 decoded successfully