Inside Google’s secret search systems: 1,200 experiments, AI agents, and entities

A deep dive into the unseen systems behind Google Search – uncovering live experiments, entity-based infrastructure, AI agents, and more.

Over the past few months, we’ve conducted a sprawling investigation into Google’s inner workings. 

It has led to major discoveries – some of which we’re disclosing here. 

While we can’t reveal everything, the insights below offer a clearer view of how Google generates and ranks its results.

What ~1,200 experiments reveal about Google’s inner workings

We obtained a list of nearly 1,200 Google experiments, over 800 of which were active as of June 2025. 

This dataset confirms that many components revealed in the 2024 leaks – Mustang, Twiddlers, QRewrite, Tangram, QUS, and others – remain central to the system. 

At the same time, it surfaces a wave of new and intriguing codenames, from Harmony and Thor to more evocative labels like Whisper, Moonstone, and Solar.