As always, YMMV!
You should not get dependent on one black box. Companies will exploit that dependency.
My version of this is having CC Pro, Cursor Pro, and OpenCode (with $10 to Codex/GLM 5.1) --> total $50. My work doesn't stop if one of these is having overloaded servers, etc. And it's definitely useful to have them cross-checking each other's plans and work.
Claude Code as "author" and a $20 Codex as reviewer/planner/tester has worked for me to squeeze better value out of the CC plan. But with the new $100 codex plan, and with the way Anthropic seemed to nerf their own $100 plan, I'm not doing this anymore.
Have you done the reverse? In my experience models will always find something to criticize in another model's work.
But I've had the best results with GPT 5.4
This flow is exhausting. A day of working this way leaves me much more drained than traditional old school coding.