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Simon Willison demonstrates Claude Opus 5.5 composing original adventure-game music, resulting in the 'Scrimshaw Jukebox' — a browser-based music player with six editable text-based tracks rendered by an in-browser synthesizer.
The author built a provider-agnostic hosting service for AI artifacts to publicly share and overcome limitations with Claude's artifacts, offering a free storage tier.
Simon Willison discusses the effectiveness of using HTML instead of Markdown as AI output format, highlighting benefits like SVG diagrams, interactive widgets, and rich explanations. Includes examples from Thariq Shihipar on Anthropic's Claude Code team and practical prompts for GPT-5.5.