Anthropic switched to HTML artifacts from Markdown to speed up internal work...

https://johnathankvdj950.wpsuo.com/is-html-output-worth-it-if-i-mostly-need-concise-content

Anthropic switched to HTML artifacts from Markdown to speed up internal work like planning, code reviews, and reports. HTML cuts output costs to just $0.08 per file and loads content 5x faster, which boosts productivity