19 November 2025

23 links · Wednesday

Building more with GPT-5.1-Codex-Max

Introducing GPT-5.1-Codex-Max, a faster, more intelligent agentic coding model for Codex. The model is designed for long-running, project-scale work with enhanced reasoning and token efficiency.

Emulator Bugs: Sega CD | jsgroth's blog

Here are two bugs that I ran into while adding Sega CD support to my Genesis emulator, both related to emulating the Sega CD’s CD-ROM hardware. These are from a while ago but I think they’re still interesting enough to write about.

Cloudflare outage on November 18, 2025

Cloudflare suffered a service outage on November 18, 2025. The outage was triggered by a bug in generation logic for a Bot Management feature file causing many Cloudflare services to be affected.

My two-part desk setup

How I turned a single long desk into a digital side for work and an analog side for reading, writing, and building LEGO with the kids.

Agent-based Systems for Modeling Wealth Distribution

We explore agent-based modeling of wealth distribution using the Affine Wealth Model, demonstrating how random transactions lead to Pareto distributions and how wealth taxes can potentially create more equitable outcomes through interactive visualizations.

What Good Execution Looks Like

Quiet execution means low operational noise, clear ownership and stable context, with delivery, reliability and human signals aligned.

Marius Bălaj

I’m a UI engineer turned founder with a background in startups. I co-founded QED in 2021, grew it, and eventually sold it to The Sandbox. Now, I’m focused on building in AI.

Claude Sonnet plays HW synth (Roland T-8)

I was discussing AI with several friends and what it does to programming and the world. One of the themes was connecting AI to physical stuff. On an unrelated path I bought some Roland synths to play with and ended up not using them much, because there is too …

Deep dive into the small details of micrograd

Introduction In this first post in a series of posts where I will deep dive into the lectures of Andrej Karpathy’s “Neural Networks: Zero to Hero” course. I want to explore the small details that were skimmed through, left out or not explained in depth in the …

What is success?

You built a product and had your first release. You had some customers. You had a seed round. You had a small team. You worked hard. Things grew. You had a Series A. Few years passed. You had very hard times. You had good times. Now you have hundreds of