Where does the “86.7% Brave overlap” figure come from, and is it reliable?

From a single vendor blog post published one day after Claude’s web search launched in March 2025, based on three commercial queries and 15 results. The underlying Brave dependency is real, but Profound’s own June 2026 re-run on roughly 400 queries revised the figure down to 79.2%. Treat the original as a launch-day snapshot that later, larger testing has already revised.