simonw/pedalican

Simon Willison's Weblog · 3 months ago · 45

A developer created a custom animated pet for Codex Desktop by using GPT-5.6 Sol and gpt-image-2 to generate sprite assets for a pelican riding a bicycle. The AI system required multiple rounds of image generation and refinement, starting with a detailed reference prompt that specified dimensions of 192x208 pixels and a magenta chroma-key background for animation. The resulting assets—including sprite sheets and animation loops—are now published in the developer's GitHub repository, with the underlying image generation and pet creation skills available as open-source Apache 2.0 licensed code.