There is also the aspect of model generations being robust under a particular ctx mgmt strategy/tailored harness. Only since this year are most models robust i

There is also the aspect of model generations being robust under a particular ctx mgmt strategy/tailored harness. Only since this year are most models robust in this way. In many open models, the problem is that successive generations are not that robust yet. i.e if you have a working setup, next generation of the same model family will need way too much reworking. So it's difficult to upgrade the model. Gemini is stellar in this respect (probably because, and I suspect, their flash models are distillations of the same larger model). OpenAI/Anthropic are too, but higher cost of newly released models is quite the blocker. Deepseek is especially hard to upgrade. Kimi doesnt target this segment, so people that can post train it do so. Qwen and llama are the stellar open ones, incredibly stable, although llama has stopped receiving upgrades in a while. It is still used a lot though.