Another thing is that unless you are doing really complicated stuff, you probably don't need the latest models running on high. I'm still on 5.4 medium with codex. I see very little reason to change that.
Part of agentic engineering is figuring out how to be economical with tokens and time. You can sacrifice one for the other of course. But there are diminishing returns as well where spending 10x more doesn't actually get you 10x more quality/results.
If I had to pay per token, I'd probably look at DeepSeek. In general it feels like it's a bit early for the technology - either our software methods are wasteful, or the hardware hasn't caught up. To me, it appears that we often need to throw more tokens at these problems, not less, since otherwise it's just one-shot slop.
I did some evals with a prompt like this when I had some subscription tokens to burn, a few months ago. I think using Opus 4.5. What I found was:
1. Running two subagents was somewhat useful
2. Running three started to get redundant
3. Any more than three was pointless (at least when using the same model)
However, even two were getting like 60% the same results.
Much, much more effective was splitting out into audits through different lenses:
* One looking for security issues
* One looking for whether the task was completed successfully
* One looking for performance issues
* One looking for contract/maintainability issues
* One looking at test coverage
Etc.