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

https://fast-wiki.win/index.php/Is_HTML_Output_Still_Too_Token-Heavy_Compared_to_Markdown_in_2026%3F

Anthropic switched to HTML artifacts for internal planning, code reviews, design systems, and reports because it cuts review latency by 5x compared to Markdown. The richer formatting and interactive elements keep teams aligned and speed up decision-making