Claude, OpenCode, Pi

Let’s get ready to build! I installed OpenCode and Pi and was amazed by how smooth the installation goes. Really quick and nice. And after being away from the command line for 10 years, it’s so nice to see the modern TUI animations. Wonderful! I want to use the Claude model family for production, so I signed up for a Pro account. Works great. Installed the Claude Code cli client, authenticated and we’re all good. Then I go to OpenCode to switch the model to Claude Sonnet. It asks me for an API key. No panic, just go to the web dashboard and look around in the settings. Nothing. Checked the documentation and found Anthropic has 2 kinds of subscriptions: chat / cowork (including code) and developer (platform). And the accounts don’t seem to be linked. AND THAT PISSES ME OFF. I’m okay with paying for stuff. But I am not okay with this intransparant bullshit. I haven’t figured out what to do yet. I don’t feel like also paying for an API key. ...

September 17, 2026 · 2 min · 358 words · Arjen

Bootstrapping This Hollow Earth

Bootstrapping This Hollow Earth. I want to know if the AI hype is real. To find out, I decided to start using AI in my day to day workflow. The idea is as follows: I am consulting about technology, product development, organisations and environmental supply chain risk. Great, but there are many people doing that and claiming to be good. How do you know if I’m for real or full of shit? By show, don’t tell. I build products and show how I do it. To build (design, engineer, ship, market, sell) the products, I will use AI. Using AI to build products allows me to learn and evaluate. I write about my adventures and publish them to exploit the teachers paradox. So, to get us started, we need 2 things: ...

September 10, 2026 · 6 min · 1098 words · Arjen

Launch Day: thishollow.earth Is Live

Launch time. Technology, Human Systems, Environment. I soft launched the new version of thishollow.earth today. New theme, new content, new streams, same me. new landing page familiar blog stream (this newsletter) new products & concepts stream new solutions page, outlining the 3 pillars (technology, human systems, environment), each with their own product show case CYNTHIA, BERT, WALTER new about page with profile, expertise,experience and how to get in touch new tech notes stream long form essay stream (TBA, in parallel from medium) scalpel stream (TBA) It’s far from finished. It’s full of errors and mistakes and omissions. But it’s something, it’s good enough and it’s live. This is part of the bootstrapping ThisHollowEarth. After bootstrapping, I will start building the products, setup a Go To Market (GTM) plan, focus on branding, visuals and design, do optimisation / tweaking / security / legal / finance and then rinse and repeat. ...

September 9, 2026 · 3 min · 441 words · Arjen