ChatGPT's use of the `site:` operator jumped 40x after the GPT-5.6 Sol rollout.

Promptwatch's tracking shows the share of ChatGPT search queries using site: sat at 0.3-0.5% for weeks, dipped to 0.15% on August 3-5, then jumped to 16-17% on August 8, two days after OpenAI said it was making GPT-5.6 Sol "more reliable with facts." Simon Willison Willison couldn't confirm a system prompt change and speculates the search tool exposes something like search(query, recency, domains) rather than the raw operator. A companion chart shows Reddit citations falling in the same window, which matters if you rank for LLM traffic.