Only Google Gemini and Microsoft Copilot run on a search index their parent actually crawls. Anthropic Claude rents Brave Search
, Mistral Le Chat rents Brave too, OpenAI ChatGPT rents Bing
plus its own crawler, and Meta AI rents both. The non-obvious tell: Claude’s web_search tool exposes a literal BraveSearchParams field, and citation overlap with Brave runs around 86.7%.
Key Takeaways
- Only Google and Microsoft own a true web-scale search index.
- Claude and Mistral both reportedly run on the Brave Search API.
- ChatGPT pulls from Bing, OpenAI’s own crawler, and publisher licensing deals.
- IndexNow tells Bing about new pages but not Brave or Google.
- Brave is now AI’s third search pole, alongside Google and Bing.
Only Five Companies Actually Crawl the Open Web
Before mapping each AI lab to its backend, the underlying constraint matters: the open web at scale is crawled by exactly five operators. Everything else marketed as a “search engine” is a reseller of one of those five indexes. The five are Google, Microsoft Bing, Yandex, Baidu, and Brave Search, with Mojeek sometimes counted as a niche sixth that maintains its own (much smaller) index.
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