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I'm a big fan of the pelican GLM-5.1 drew me today, it even animated it! https://simonwillison.net/2026/Apr/7/glm-51/
Simon Willison tested Z.ai's GLM-5.1 using his standard 'pelican on a bicycle' SVG benchmark, and the model stood out by spontaneously generating a full HTML page with both the SVG and a separate ...
Simon Willison tested Z.ai's GLM-5.1 using his standard "pelican on a bicycle" SVG benchmark, and the model stood out by spontaneously generating a full HTML page with both the SVG and a separate set of CSS animations — unprompted . The pelican's beak included a wobble animation and the wheels spun , though the animation initially broke positioning, causing the pelican to fly off to the top-right . When prompted to fix it, the model correctly diagnosed and resolved the issue , making this one of the most notable open-weights SVG generation results Willison had seen.
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Source: tools