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AI Search

How AI assistants choose sources: ChatGPT, Perplexity & Claude

Most AI assistants pick sources by running a live web search: they rewrite your question into several queries, pull candidate pages from a search index — Bing for ChatGPT and Copilot, Brave for Claude, Google's own for AI Mode, Perplexity's 200-billion-URL crawl — and quote the passages that answer most directly. Which index each engine uses decides who gets cited.

July 4, 2026

Long-form research

How to Build a World-Class GA4 Setup

Most Google Analytics 4 installations record data without measuring anything a business can act on. This dissertation documents the audit and reconstruction of one such property from first principles, and generalizes the work into a method any practitioner can follow.

Francisco Contreras · July 2026 · 66k words