Anthropic switched to HTML artifacts over Markdown for internal planning, code...

https://fun-wiki.win/index.php/HTML_Artifacts_Stopped_Being_Snappy_for_Me_%E2%80%93_How_Do_You_Deal_with_5x_Slower_Generation%3F

Anthropic switched to HTML artifacts over Markdown for internal planning, code reviews, design systems, and reports because HTML offers richer formatting and clearer structure