At Anthropic, we switched from Markdown to HTML artifacts for internal...

https://future-wiki.win/index.php/Why_Do_Richer_Visual_Formats_Lead_to_Better_Product_Development_Outcomes%3F

At Anthropic, we switched from Markdown to HTML artifacts for internal planning, code reviews, design systems, and reports because HTML cuts output costs by 8 cents per item and loads 5 times faster