Anthropic switched to HTML artifacts because they deliver 5x faster load times...

https://www.mikegingerich.com/blog/anthropic-adopts-html-over-markdown-for-workflows/

Anthropic switched to HTML artifacts because they deliver 5x faster load times compared to Markdown. This speed boost keeps internal plans, code reviews, design systems, and reports smooth and responsive for over 4.4 million views each month