Open labs embrace continued post-training on existing models to achieve performance gains without retraining new base models

A few years ago, every generation of model releases came entirely as new models, such as Qwen, Qwen 1.5, 2, 2.5, 3, and 3.5, llama, llama 2, llama 3, etc. But with the events of the recent few days, I think we can...