I use Opus 5.5 for planning, sprinkle in a Fable 5.1 review of the spec (they go back and fourth), then send the spec and plan to my local deepseek 4.1 Flash 1017 to implement. It crunches away for a good while (using ds harness)

Then check w/ Opus and Astra for good measure if it really matters. Works well. DSv4.1 is okay but does make mistakes. I run my 2x DGX sparks at 60-70% capacity this way, which nets about $400/mo worth of tokens on $30 of electricity.

I am hoping in the next six months to be able to in-house ALL of the above using a slightly more competent model, or two more sparks. It is slow running local, but it is really fascinating to have all this work done from my desk.