David Heinemeier Hansen

“Then we get to November 24th, 2025. Opus 4.5, to me, was the dividing line. Where suddenly, I didn't even try it on the 24th. I think I tried it on the 26th. I give it a couple of tasks. And I realized that the quality of the output is uncannily close to what I would have written.”

“We just released Basecamp 5 not too long ago. That was the first product at 37signals that was really agent accelerated.”

“Umachi Quattro launched on Friday. It's been downloaded by tens of thousands of people and they like it. They like it a lot.”

“Tail scale is essentially turning all the computers you have into a local network wherever you are. Like right now on my phone, I have direct access to all the computers in my Malibu office.”

“I bought these amazing KVMs called GLI.net Comets. And what they do is it's this little box. You plug in HDMI, you plug in USB and connect it to the computer... You connect this thing in, you go to a webpage, log in one, set one password. Now this thing can hop on your tail net.”

“I've switched to this thing called Herder. And Herder is essentially Tmux plus agent notifications. So whenever your agent is done and needs something for you, it goes ding! A little bell telling you it's ready for its human.”

“This summer, with Opus 5, Fable, and Sol, GPT Sol, and to a lesser extent, some of the open weight models, we've arrived at a new era.”

“Toby, Toby Lutka, the CEO of Shopify and now my partner in crime on this Omachi project in part, he's gotten pilled with Omachi as well. He saw these things very early and he tried to tell me.”

“I've been running this Zomachi project now for a little over a year. And in the last three months working on Quattro, I have merged over a thousand pull requests. Quite a lot of those pull requests were written by people who were not classical programmers or were programmers in other domains.”

“As soon as you're having human teams work together on something, the bottleneck is rarely implementation. It's human bandwidth and communication... The revelation I've had working on Amachi the last three months is that to get that magical 10x, 100x, in a few rare cases, 1000x productivity boost, you have to interact with the agents directly.”

“Opus 5 was that the system prompt that they shipped for Opus 5 and presumably also Fable shrunk by 80% because the agent not only needed far less human instruction, it was actually being damaged by overly prescriptive humans.”

“This is the classic innovators dilemma. These companies have gotten so good, so established at the old way, and therefore their entire structure, management layers, processes are tuned for a time that no longer exists. But you can't pivot that. These are super tankers. It just doesn't happen.”

“There is great payoff to writing systems that agents have an easier time dealing with and evolving without having to relearn the entire context. Just like humans. If they can make iterations and changes to the code base without wrecking the architecture, they can make the next change just as cheap as the last one.”

“I don't know, three agents. I have about 16 threads. That's what I can run. And the faster the agents run, of course, the fewer threads I can run. But at the current pace, I can run about 16 threads at full acceleration.”