After 434 Days, ChatGPT and Claude Remain Unable to Render JavaScript—Gemini and Copilot Still Succeed
TLDR
GSQi Blog retested AI search platforms 434 days after an initial study and found ChatGPT, Claude, and Perplexity still cannot render JavaScript-based content, while Gemini and Copilot—which leverage Google and Bing's crawlers—continue to succeed.
Optimixed Overview
Optimixed's original report on this story.
GSQi tested five AI search platforms against sites using JavaScript rendering at varying levels and found the divide unchanged: ChatGPT, Claude, and Perplexity failed to access or accurately read JS-rendered main content, often seeing only page shells, navigation, and footers, while both reported missing or corrupted text. Gemini and Copilot succeeded in all tests because they leverage Google and Bing's indexing infrastructure, which can process JavaScript. The retest confirms the findings from August 2025 and reinforces that site owners relying on client-side JS rendering risk invisibility to independent AI search platforms—a practical constraint for content optimization toward AI Overviews and generative engines.