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Overview
Clear thinking about AI from someone building it in production. No hype, no hand-waving. Just what works, what doesn't, and why it matters. My book is out: builder-leader.com. Click to read Run Data Run, by Justin Johnson, a Substack publication with hundreds of subscribers.
News
Twenty-five years and half a mile
The morning before my first day at Tempus I went for a run through Chicago.A couple of miles in, I recognised the route. Not the way you recognise a place in a photograph. The way your legs recognise a hill before you do. I had run this before.I had spent
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Take the Cast Off
Every Sunday I pick one paper or release that's worth your time, break it apart, and tell you why it matters. No hype. No summaries of summaries. Just the idea, explained.In late July, Anthropic deleted more than 80% of the system prompt that runs Claude
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I moved my whole AI coding setup to a model that costs 40 cents. Nobody noticed the difference.
My AI coding setup is two years old. It is not a model. It is a system: rules for how the assistant should behave, skills it knows how to use, specialized agents for different kinds of work, guardrails that stop it deleting things it should not. I built i
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Somebody Is Finally Checking
Every Sunday I pick one paper or release that's worth your time, break it apart, and tell you why it matters. No hype. No summaries of summaries. Just the idea, explained.A published result is a promise. Run this, and you will see what we saw. For most of
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Nobody Saves Money on the Model
Last week a team at Cognition, the company behind the coding agent Devin, published a number that reads like a typo. They replaced Opus 4.8 with Fable 5. Fable 5 costs about twice as much per token. Their bill went down.Not their quality. Their bill.Here
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