Anthropic switched to HTML artifacts for internal planning, code reviews,...

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 for internal planning, code reviews, design systems, and reports because HTML delivers clearer formatting and richer interactivity than Markdown. This change cut output costs to just $0