Anthropic switched to HTML artifacts from Markdown because HTML lets their...

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

Anthropic switched to HTML artifacts from Markdown because HTML lets their teams create richer, interactive internal docs for planning, code reviews, design systems, and reports. This change cut output costs to just $0