tl;dr: The author argues that switching from proprietary LLMs (Claude, GPT) to open-weight models now carries only a minor productivity penalty, similar to how the Linux vs. Windows gap has narrowed over time. Triggered by Claude's new ID verification requirement, he's moving to open models—which trail leaders by only a few months and have decent tooling—while acknowledging tradeoffs around privacy (third-party hosts like OpenRouter feel less trustworthy) and the cost/complexity of self-hosting.