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Codex 5.6 sol is arguably superior to Claude, albeit very close. They're functionally indistinguishable to me, but if you're concerned about $$, Codex gives you much, much more bang for your buck.

I've been using Grok instead of Opus the past few weeks.

It's a downgrade, but barely noticeable for me and totally inconsequential for the amount of work required to fix it and the corresponding $$$ saving.

For a personal project I’ve been piloting Spec driven development (SDD), (it’s contagious!), using Cursor and EARS statements. The strategy has been to use the frontier model to write the spec and a lessor model to write the tests and code and the frontier model to write critiquing prompts until it has nothing left to say. For my particular project there are two programs (or in human speak phases), where each program is broken up into milestones which are then comprised of a series of tasks. I experimented a lot with different models as the reviewer / spec model and the implementor model. Kimi 3 was super expensive as spec model and grok and OpenAI models always got something wrong egregiously. The Opus line of models have been the only ones to really grasp the project and I feel write great specs. Because I use cursor I settled on using groc for test routing and code implementation. I’m not sure if this is the most efficient method but I believe it’s building a large project solidly

If it's purely about $$, what about the newer open models. DeepSeek and Kimi are roughly equivalent performance for a hell of a lot cheaper.