If anything, it's going to be more expensive. Price/performance ratio isn't there yet for frontier open weight models. But regardless, you definitely should us

If anything, it's going to be more expensive. Price/performance ratio isn't there yet for frontier open weight models. But regardless, you definitely should use a harness where switching models on the fly is easy. There's a reason why Anthropic uses their own proprietary formats/conventions anywhere they can - to lock you in when inference eventually commoditizes.