Semrush expands AI visibility index as SEO shifts to AI answers
Semrush’s AI visibility index jumped from 2,500 prompts to 126 million, and only 9% of marketing leaders say they can track the full picture across AI answers.
Semrush widened its AI Visibility Index from an early 2,500-prompt benchmark to 126 million real U.S. AI search prompts, pushing SEO measurement deeper into the world of AI-generated answers. The expanded 2026 index covered January through April 2026, tracked performance across 22 industries, and compared visibility on ChatGPT, Google AI Mode, Google AI Overview, and Gemini.
That scale matters because the reporting gap is already obvious. Semrush found that 45% of marketing leaders cannot accurately measure their brand visibility inside AI-generated answers, and only 9% have tools that track all relevant metrics across platforms. Adobe data cited in the report shows why agencies are being pushed to adapt faster: AI traffic to U.S. retail sites rose 1,324% between October 2024 and May 2026, while travel AI traffic climbed 2,215% over the same stretch.
The new benchmark also showed how uneven AI visibility can be from one platform to the next. Only 36 global brands held top-100 visibility across all four platforms every month of the study, a narrow club Semrush labels the “Universal 36.” For agencies managing white-label SEO or multi-brand retainers, that is the clearest warning in the release: a client can look healthy in one AI surface and disappear in another, even when classic rankings appear stable.
Semrush first launched the AI Visibility Index in September 2025 with more than 2,500 real-world prompts and a narrower industry set that included Finance, Digital Tech, Business, Fashion, and Consumer Electronics. The 2026 version stretches that model into something bigger and more operational, with visibility trends by sector and platform-level comparisons designed to show which brands are mentioned, cited, and surfaced by AI systems. Semrush says the methodology pulls the most mentioned brands and most cited domains from its prompt database, turning AI discovery into a measurable channel rather than a vague brand-awareness claim.
The company has been signaling that shift for months. In March 2026, it announced Spotlight 2026 in London as a conference focused on the convergence of SEO and AI Search. Adobe then announced Adobe Brand Visibility on June 17, 2026, describing it as a unified solution that combines Semrush’s AI visibility intelligence with Adobe’s agentic content optimization capabilities. The message is blunt: agencies that still report only on rankings and traffic are already behind the measurement curve.
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