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Giving Claude Fable access to an OpenAI API key lets it generate textures and title art, filling a capability gap.

The author provided an OpenAI API key, and Fable used it with gpt-image-2 to generate all game textures and the title screen art, committing them as static assets so the deployed game makes no API calls. ✦ AI generated

Simon Willison · Simon Willison's Weblog · 2026-08-05 · original ↗

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I didn't make any technology choices. I assumed (correctly) that it would probably use Three.js based on previous experiments. Giving Claude access to an OpenAI key turns out to work really well for filling in gaps in its capabilities - in this case we needed some way to generate images to use as textures. Fable is very good at prompting image generators!

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▦ OpenAI ✳ Claude Fable ✳ gpt-image-2 ✳ Three.js

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