Ember-1 is Kimi K3 post-trained for 40% more concise reasoning

Ember-1, a model built on Kimi K3 through post-training, reportedly reasons 40% more concisely while keeping the same quality and running 40% faster and cheaper. Sebastian Raschka cites it as an example that starting from an existing frontier LLM and investing the budget in post-training is an effective development path.