In the evolving AI landscape, HTML is emerging as the preferred format for interactive outputs, surpassing Markdown's traditional role. While Markdown remains efficient for structured text and AI input due to its low token usage, HTML's ability to host interactive components and complex logic makes it ideal for AI deliverables. Tools like Claude Artifacts and Openclaw leverage HTML to provide real-time, interactive outputs, enhancing user engagement and satisfaction. The shift towards HTML is reflected in the market, with platforms like Anthropic and OpenAI investing heavily in HTML-based solutions. Anthropic's Claude Artifacts has increased user retention by 22%, while OpenAI's Canvas feature aims to compete in the enterprise segment. As token costs decrease, HTML's interactive value outweighs its higher token cost, positioning it as the standard for AI-generated user interfaces.