Anthropic switched to HTML artifacts because they cut output costs by 8 cents...

https://www.bookmarks4all.win/anthropic-switched-from-markdown-to-html-artifacts-to-speed-up-internal

Anthropic switched to HTML artifacts because they cut output costs by 8 cents per file and handle 4.4 million views with less lag. HTML lets their teams build clearer design docs, smoother code reviews, and richer reports compared to Markdown