# The four questions shaping the AI stack, from apps to data centers

> Original title: The Four Questions of AI

- Source: Tomasz Tunguz
- Published: 2026-11-02T00:00:00.000Z
- Bad Influence: https://badinfluence.news/items/ms31y7weaa3ywcbr0ggdy4gq6
- Original: https://tomtunguz.com/the-four-questions-of-ai/

## Summary

Tomasz Tunguz argues the AI stack has four layers, each with a fundamental question: applications, the harness and context layer, foundation models, and data centers. He says the layers are coupled, so pressure at one level, such as rising GPU prices or higher borrowing costs, can shift the economics of the whole stack.