For a while I used Cerebras Code for 50 USD a month with them running a GLM model and giving you millions of tokens per day. It did a lot of heavy lifting in a software migration I was doing at the time (and made it DOABLE in the first place), BUT there were about 10 different places where the migration got fucked up and had to manually be fixed - files left over after refactoring (what's worse, duplicated ones basically), some constants and routes that are dead code, some development pages that weren't removed when they were superseded by others and so on.

I would say that Claude Code with throwing Opus at most problems (and it using Sonnet or Haiku for sub-agents for simple and well specified tasks) is actually way better, simply because it fucks things up less often and review iterations at least catch when things are going wrong like that. Worse models (and pretty much every one that I can afford to launch locally, even ones that need around ~80 GB of VRAM in the context of an org wanting to self-host stuff) will be confidently wrong and place time bombs in your codebases that you won't even be aware of if you don't pay enough attention to everything - even when the task was rote bullshit that any model worth its salt should have resolved with 0 issues.

My fear is that models that would let me truly be as productive as I want with any degree of confidence might be Mythos tier and the economics of that just wouldn't work out.