I've been looking really hard at combining Roslyn (.NET compiler platform SDK) with one of these high end tool calling models. The ability to have the LLM create custom analyzers and then verify them with a human in the loop can provide stable, compile-time guarantees of business rules that accumulate without paying for context tokens.

I feel like there is a small chance I could actually make this work in some areas of the business now. 400k is a really big context window. The last time I made any serious attempt I only had 32k tokens to work with. I still don't think these things can build the whole product for you, but if you have a structured configuration abstraction in an existing product, I think there is definitely uplift possible.