AFAIK that model is pretty old, and it was explicitly trained for SVG generation. For other models the capability of generating SVGs of real stuff is accidental. Same as GPT-5.x and Sonnet 4.5+ being able to generate MIDI music.

It's generating a raster image and then using a tracing algorithm to turn it into an SVG, rather than generating an SVG via coding from the ground-up. If you put a raster image into Adobe Illustrator and use its image tracing you'll get a similar result.

This is also interesting: https://static.simonwillison.net/static/2025/pov-pelican-opu...