---
title: "AI Engineer World's Fair 2026: Software has changed"
description: "Theo Browne argues that stronger models call for wider software work and extensible products."
plain: "Theo says developers miss what new models can do when they keep asking them for the same narrow tasks."
group: source
speaker: "Theo Browne"
date: 2026-07-08
url: https://youtu.be/xUnRQ9vLXxo
sources:
  - url: https://youtu.be/xUnRQ9vLXxo
    title: "Everything we knew about software has changed — Theo Browne, @t3dotgg ​ - YouTube"
    publisher: "Theo Browne"
    note: "Recording; used for wider software work and user-extensible products."
    accessed: "2026-10-01"
---

# AI Engineer World's Fair 2026: Software has changed

> For agents: start with the [agent guide](https://ratstack.sh/llms.txt). Every page is Markdown by default; add `Accept: text/html` for HTML.

New on /news: [Effect Office Hours 52 with Resonate HQ](/news).

Theo says developers can miss new model capabilities when they keep prompting for the same narrow tasks. [02:35](https://youtu.be/xUnRQ9vLXxo?t=155) [02:58](https://youtu.be/xUnRQ9vLXxo?t=178)

He separates breadth from depth: products can cover more ground while leaving users room to build missing features within a product area. [13:07](https://youtu.be/xUnRQ9vLXxo?t=787) [13:23](https://youtu.be/xUnRQ9vLXxo?t=803) [14:37](https://youtu.be/xUnRQ9vLXxo?t=877)

## Sources

1. [Everything we knew about software has changed — Theo Browne, @t3dotgg ​ - YouTube](https://youtu.be/xUnRQ9vLXxo)
   Theo Browne. Recording; used for wider software work and user-extensible products. Accessed 2026-10-01.

## Linked from

- Agent guide → An Effect stack so pure (aspirational) Kit Langton will blush. → [Read page](https://ratstack.sh/llms.txt)

- Change log → What changed in the files served here, newest first. → [Read page](https://ratstack.sh/log)

- Cloud as a library → Sam Goodwin argues that cloud services can be consumed as libraries inside an application. → [Read page](https://ratstack.sh/lore/cloud-as-a-library)

- Full agent guide → An Effect stack so pure (aspirational) Kit Langton will blush. → [Read page](https://ratstack.sh/llms-full.txt)

- Rat Stack lore | rat-stack → Short, source-grounded notes on the ideas and decisions behind rat-stack. → [Read page](https://ratstack.sh/lore)

- Source change history (log.md) → The generated change log as Markdown. → [Read page](https://ratstack.sh/log.md)

- Think wider → Theo Browne asks developers to cover more product breadth instead of adding depth in one narrow area. → [Read page](https://ratstack.sh/lore/think-wider)