The search index is provided by Brave: https://simonwillison.net/2025/Mar/21/anthropic-use-brave/ - Brave is now listed as a subprocessor on the Anthropic Trust Center portal - Search results for "interesting pelican facts" from Claude and Brave were an exact match - If you ask Claude for the definition of its web_search tool one of the properties is called "BraveSearchParams"
Very disappointing, Brave is the last company I want my data going to
If you’re unhappy about something, try to first think of a solution before expressing your discontent.