Simon WillisonMar 20, 2025
Anthropic shipped a new "web search" feature for their Claude consumer apps today, here are my notes - it's frustrating that they don't share details on whether the underlying index is their own or run by a partner https://simonwillison.net/2025/Mar/20/claude-can-now-search-the-web/
Claude can now search the web

Claude 3.7 Sonnet on the paid plan now has a web search tool that can be turned on as a global setting. This was sorely needed. ChatGPT, Gemini and Grok …

Simon Willison’s Weblog
Show threadSimon WillisonMar 21, 2025

It's using Brave as the search index, they quietly updated their "Trust Center" and added Brave Search as a subprocessor
https://simonwillison.net/2025/Mar/21/anthropic-used-brave/

https://bsky.app/profile/zugaldia.bsky.social/post/3lkvgzvarvs2s

Anthropic Trust Center: Brave Search added as a subprocessor

Yesterday I was [trying to figure out](https://simonwillison.net/2025/Mar/20/claude-can-now-search-the-web/) if Anthropic has rolled their own search index for Claude's new web search feature or if they were working with a partner. Here's …

Simon Willison’s Weblog
Show threadPeter Bhat Harkins
@simon This sounds a lot like Brave's practice where end users are mules to evade site controls of Brave's standard-defiant crawler: https://lobste.rs/s/iopw1d/what_s_up_with_lobste_rs_blocking_brave#c_xhmzzr
What's up with Lobste.rs blocking the Brave browser? | Lobsters

Mar 21, 2025 at 5:36pmWeb
Show threadAlex NedelcuMar 21, 2025
@pushcx If you're referring to the browser informing Brave what to crawl, Chrome does the same thing for Google and it's opt-out (Brave's opt-in), meaning that after you login, Chrome starts sharing your browsing history to Google, with the declared purpose of improving search, even if you have an encryption password set. Google also uses that data for Gemini.