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Karl Matthias postedMar 10, 2026
Claude is currently unwinding some bad code written by Codex because it explicitly ignored rules, even when the context was not full. Done with Codex, done with OpenAI.
Karl Matthias postedMar 9, 2026
Well, I'm done with Codex. First, because OpenAI is going to let the Dept of Defense do whatever they want with their tech (including kill people and surveil Americans). Second, the thing is down today and there is no status posted on OpenAI's site. Third, they clearly shadow released the new model last week (which wrote much worse code) and inflicted it on people without announcing it until today. Just a bad company. #AI
Karl Matthias postedMar 5, 2026
I just had the realization that this thing, which I built awhile ago, is basically an AI agent-friendly billing system! https://github.com/relistan/billmonger
RE: https://toot.cat/@ceejbot/116169056742912847
This is a fucking great take on AI and how people involved in making software should think and act in this moment.
Karl Matthias postedFeb 28, 2026
After a couple of weeks using Codex, I am pretty happy with it as a step-up improvement over Claude Code. It tends to do the right thing more frequently and without interaction, and the sandbox model prevents continuous interaction over permissions. Still not a perfect tool, of course, but I am pleased. #AI
Local-first? Offline-first? There is more to ditching The Cloud!
🍃 The leaf architecture describes apps that are:
Local
Encrypted
Autonomous
Federated
Karl Matthias postedFeb 23, 2026
Enjoying how trivial it is to improve all my development tooling and environment by having AI just write the tool I want and haven't made time for. Latest example: macOS xbar plugin that tracks both my open PRs and also review requests. It uses magick to generate nice icons that sit in the tray like this (the two numbers on the left):
Karl Matthias postedFeb 20, 2026
Our free credits with Claude (Anthropic) ran out and so I've been using Codex (OpenAI) for the last few days. It's much mellower than Claude in expression, but seems maybe more competent even. So far I am impressed.
Karl Matthias postedFeb 18, 2026
I'll be writing a blog post about this, but at Mozi we just open-sourced a tool I wrote that I've been using a lot: https://github.com/mozi-app/mermAId . It's a Mermaid live editor / MCP server that is made to interact with LLM agents while planning. The agent can push and pull Mermaid diagrams from the editor. The editor has vim bindings support if you want to use them. On macOS it's a native app, on Linux and Windows it runs a server and opens the UI in the browser. There is an accompanying CLI script for those who prefer that over MCP. The details are all in the README.
Karl Matthias postedDec 8, 2025
I spoke at the Augmented Software Engineering meetup two weeks back about 6 months of agent-assisted coding with Claude. #AI #Agentic #ClaudeCode