how does the chatgpt search tool actually work under the hood?
ChatGPT search works by routing user queries through a classifier that decides whether to invoke web retrieval, then querying Microsoft Bing's index, reranking results with an OpenAI model, and synthesizing an answer with inline citations. OAI-SearchBot crawls and refreshes pages independently for caching. The rerank step weighs answer-span quality, source diversity, recency, and prior citation patterns. Results are streamed with cited URLs in a separate sources block. Users can request follow-ups that re-enter the retrieval loop with conversational context preserved.
Evidence and detail
- ChatGPT search retrieves from Microsoft Bing's index per the OpenAI and Microsoft partnership disclosed in 2023.
- OAI-SearchBot independently crawls pages for caching and freshness signals, separate from Microsoft's Bingbot retrieval pipeline.
- Rerank weights include answer-span quality, source diversity, recency window, and prior citation history across the user's query topic.
- Citation blocks return inline URLs that users can click through, driving measurable referral traffic to source domains.
Related reading
Other buyer questions
- how do i get my site cited by chatgpt search in 2026?
- what are the ranking factors for perplexity in 2026?
- what sources does claude actually cite when it answers questions?
- how does google ai mode decide which sources to show?
- why does bing matter so much for ai search optimization?
- what is the difference between llms.txt and llms-full.txt?
- how should i configure robots.txt for ai bots in 2026?
- what schema markup do i need for ai search citations?
Browse all buyer questions → Industry playbooks → Competitor comparisons →