Simon Willison 8/20/2026

ChatGPT search now uses the site:operator at scale

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This article discusses a notable change in ChatGPT search behavior: the percentage of search queries containing the 'site:' operator jumped from around 0.3-0.5% to 16-17% following the GPT-5.6 rollout. Promptwatch, a tool in the Generative Engine Optimization (GEO) space, tracked this shift and also observed a reduced likelihood of Reddit appearing in search results. The author speculates on the underlying system prompt changes and notes OpenAI's obscurity, relating this to broader trends in AI-driven search and content visibility.

ChatGPT search now uses the site:operator at scale

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