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

https://speedy-wiki.win/index.php/What%E2%80%99s_the_Difference_Between_an_Artifact_and_a_Normal_Claude_Response%3F

Anthropic switched to HTML artifacts from Markdown for internal planning, code reviews, design systems, and reports because HTML cuts rendering time by 5x and reduces output costs to just $0.08 per document