> Coding faster leads to less understanding and higher long-term risk. Source-Code amnesia is real, and there’s a time requirement to really understand and appreciate what a system is actually doing.

This is why I have switched nearly all of my personal coding experiments over to Qwen3.6 27B. Opus make it easy to gloss over too much and to delegate too much. And so I don't build sufficient memory of the code to provide long-term oversight.

But Qwen3.6 27B sits on an really interesting balance point. It understands code well enough to get 80% of the way to a good design, and it can fully implement a well-specified feature. But if my understanding of the code starts to weaken, things start going wrong much more quickly than they do with Claude.

Opus will happily take complex code beyond the point of salvation, if you allow it. I'm currently cleaning up a successful prototype code base right now, one that was partially vibe-coded and now needs to be put into production. And Opus generated massive amounts of tech debt. So clearly people who lean into vibe coding will need to keep upgrading their models for many years to keep up with the mess created by earlier models.