Anthropic switched to HTML artifacts from Markdown because they cut output...

https://technivorz.com/is-html-a-good-default-for-design-systems-compared-to-markdown-docs/

Anthropic switched to HTML artifacts from Markdown because they cut output costs by 92%, saving about $0.08 per document. HTML lets their teams build rich, interactive internal planning, code reviews, and design systems that boost clarity and speed