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

https://www.slideserve.com/aaron_ward92/what-s-a-practical-html-artifact-layout-for-a-code-review-with-3-findings

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