Kimi K3, an open model, is competitive with Fable, a closed model, and when used together with Fable, they achieve state-of-the-art results. The study found that Kimi K3 can be up to 50x lower cost on certain tasks and is cost-optimized for all work types. The article suggests that using a router to select the best model for each task can lead to better performance and lower costs. The combination of Kimi K3 and Fable can unlock their best qualities at the best price.