ChatGPT search jumps to using site: operator at scale after GPT-5.6 rollout

Promptwatch occupies a growing niche called GEO (Generative Engine Optimization)—the chatbot equivalent of SEO, where companies track and consult on how to boost a website's visibility in AI tool responses. The firm's tracking data has become a window into otherwise opaque product changes at OpenAI, Anthropic, and Google, because those companies do not publish detailed logs of their system-level adjustments. The jump from 0.3–0.5% to 16–17% usage of the site: operator over a single day on August 8 is striking because it indicates a coordinated rollout, not a gradual shift. The brief dip to 0.15% on August 3–5 hints at a staged experiment or pre-launch test before the wider deployment. OpenAI's vague public announcement on August 6 about "more reliable facts" and "more focused answers" provides cover for the underlying change but does not explain the mechanism—that ChatGPT's search function may now use a structured shape like search(query, recency, domains) rather than simply encouraging users or the model to include site: syntax. The subsequent August 18 report that Reddit sourcing appeared to decline reinforces the picture of deliberate, incremental changes to ChatGPT's information diet, though without system prompt visibility, observers cannot confirm whether the discouragement is explicit or emergent from training shifts.