✨ Arches National Park, Utah 🇺🇸 by Elliot McGucken

Notes on GPT-5.6, which includes some interesting new additions to the API (programmatic tool calling and multi-agent in particular) - plus 18 pelicans for the 6 reasoning levels and 3 new models: simonwillison.net/2026/Jul/9/g...

The new GPT-5.6 family: Luna, Terra, Sol

OpenAI’s latest flagship model hit general availability this morning, and comes in three sizes: Luna, Terra, and Sol (from smallest to largest). The new models are priced per 1M input/output …

simonwillison.net

the replacements.fyi site now lets you drop a package.json into it to see which dependencies can be replaced with native functionality, or more performant choices 🎉

I've published the first two chapters of a new guide to Agentic Engineering Patterns - coding practices and patterns to help get the best results out of coding agents like Claude Code and OpenAI Codex simonwillison.net/2026/Feb/23/...

Writing about Agentic Engineering Patterns

I’ve started a new project to collect and document Agentic Engineering Patterns—coding practices and patterns to help get the best results out of this new era of coding agent development …

simonwillison.net

This talk by @worrydream is legendary. I come back to it every few years, and it still blows my mind. Absolutely love it! www.youtube.com/watch?v=PUv6...

Bret Victor - Inventing on Principle

YouTube video by Rui Oliveira

youtube.com

Now this is impressive stuff!

Simon Willison@simonwillison.net · 6mo ago

The latest entrant in the coding-agent-constructed web browsers is here, this one by @emsh.cat, and it's REALLY impressive - 3 days of development, 20,000 lines of Rust, no Cargo dependencies and it renders HTML+CSS extremely well simonwillison.net/2026/Jan/27/...

Even in the year of revolutionary AI advancement this is the most sci-fi thing I have seen in 2025 www.youtube.com/watch?v=MiUH...

The Ridiculous Engineering Of The World's Most Important Machine

YouTube video by Veritasium

youtube.com

Even without the rise of AI stackoverflow was slowly loosing traffic to discord servers, if you use a technology which is not that popular and less data available, LLMs will have hard times with those projects, but you can always get a helpful response from discord, often from the core contributor.