Brennan
builds things

Founder, CEO, advisor and speaker.
Customizing your experience

Recent Posts

Aug 2025

Prompting Your Prompt's Prompt
Is Turborepo Is the New Collaboration Surface?
The Disposable Intelligence Era

Jul 2025

Calvin's OpenAI Reflections
How I Document Agent Instructions

Jun 2025

Coding in 2025
You. Are. Not. Using. Enough. Compute.
How I Made My Blog Remember You

May 2025

Testing 4o images from the API

Apr 2025

OpenAI vs. Anthropic vs. Google AI
Seeing UV: Detecting Intelligence Beyond Ours
o3 & o4-mini: OpenAI's latest models
GPT-4.1: A true x.1 Release
If AI-2027 Is Right: What Should We Do?
How I Built a Fully-Automated Agent to Promote My Content on 𝕏 and TikTok

Mar 2025

GPT-4o finally gets it's multi-modal moment
A New “Time Horizon” Metric and Doubling Trends
Blogging in 2025
Does Intelligence Make AI Lean Left?
GPT-4.5 is actually a big deal

Feb 2025

Emergent Misalignment: The Hidden Dangers of Narrow Fine-Tuning
Blueprints for the Next-Gen Code Agents
Notes from Deep Dive into LLMs
o1 to o3 - A Bitter Lesson in Coding
What does Claude's usage tell us?
Linear intelligence, superlinear impact?
User’s Attention is All You Need

Jan 2025

Building The Brain