boltTLDR
Search Engine Journal analyzed ChatGPT's rebuilt search tool and found its new tool-call format reveals which sources it retrieves—including a notable finding that zero Reddit threads were cited despite 84 entering the pool.
Search Engine Journal examined ChatGPT's updated search functionality and decoded its new language structure. The analysis shows that ChatGPT's tool-call format now exposes which URLs and sources the system fetches before generating an answer—a transparency signal into how the model prioritizes and integrates search results. A key observation: 84 Reddit threads entered the retrieval pool but none were ultimately cited in the response.