Kimi K3 is competitive with Fable; Kimi K3 + Fable is SoTA.

In a detailed exploration of the advantages of model routing over singular model use, the study evaluates Kimi K3, an open model, against Fable 5, a closed model, for their performance across approximately 1,030 tasks. The analysis reveals that routing tasks between the two models achieves 93% accuracy and is up to 50 times more cost-effective than using Fable alone, particularly for long agentic operations. The study utilized oracle routing to determine that K3 was selected for 72-96% of tasks, indicating that it is often the more cost-effective choice. While K3 and Fable display near-identical overall performance, they excel in different areas, with K3 leading in symbolic math and security tasks, and Fable in multi-language coding tasks. The research emphasizes the cost advantage of K3 due to token pricing and prompt caching, suggesting that routing tasks to the most suitable model leads to superior results both in quality and cost. This approach challenges the traditional reliance on single models, proposing that a mixture of models tailored to specific workloads yields the best outcomes, with K3 serving as a cost-efficient baseline and Fable as a specialized option.

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