Anthropic switched to HTML artifacts because they cut review latency by 5x...

https://foxtrot-wiki.win/index.php/Is_HTML_Output_Worth_It_If_I_Mostly_Need_Concise_Content%3F

Anthropic switched to HTML artifacts because they cut review latency by 5x compared to Markdown. With 4.4 million views a month, faster feedback means teams catch issues sooner and ship features quicker