Kimi K3 vs Claude Fable 5 and Opus 4.8: a benchmark you can run yourself

Kimi K3 was released this week, prompting comparisons with Claude Fable 5 and Claude Opus 4.8. While leaderboards provide scores, a new open-source benchmark on GitHub evaluates code structure and maintainability. This analysis reveals that Kimi K3 is competitive with Fable, and both are considered SoTA. The benchmark allows users to examine the actual code produced, moving beyond simple results to understand how these models perform in real-world programming scenarios and maintenance.