Kimi K3 and Fable 5 now look much closer than the old open-vs-closed gap
FinanceYF5 · x · 2026-07-21
This post frames a deeper look at Kimi K3 versus Fable 5 on software engineering / DeepSWE tasks and argues that frontier open models are no longer six months behind. The chart shown in the image is a side-by-side product card: Kimi K3 is open source, while Fable 5 is closed.
The thread’s surrounding results suggest Kimi K3 is now competitive with top closed models on best-of-k coding-style tasks, with only small gaps in pass rates and failure patterns that look increasingly similar across vendors.
Related event: Kimi K3 Matches Fable 5 in SWE Benchmarks at a Third of the Cost(7 posts)→
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