Look for the current crop of local Mixture of Experts models, where it seems like they've made inroads on the O(n^2) context attention cost problem. Several folks have mentioned Qwen, but there's many more of that ilk. Several of them actually score really high on benchmarks. But when I mess with one of them locally by hand myself, (I have a 3090), it feels a bit like last year's Sonnet. They don't quite make the leaps of understanding you get from Opus.

* Weird thing of the day: https://huggingface.co/Jackrong/Qwen3.5-27B-Claude-4.6-Opus-...