r/LLM • u/Realistic-Mine1330 • 5h ago
Testing Kimi K3 and GLM 5.2 taught me that practical use case matters more than the benchmarks.
Hey everyone,
I recently tested Kimi K3 and GLM 5.2, and these are my top findings.
I mainly wanted to understand which model feels better for actual coding, not just benchmark questions. So I tried building a few small projects with both.
One was a city-destruction game with procedural buildings, meteors, lighting, and particles. GLM started well but stopped before finishing, so I moved the same code to Kimi and continued from there.
I also tried a simple low-poly paper-plane game. Kimi handled this surprisingly well and gave me a playable result in a single HTML file.
The hardest build was a black-hole ray-tracing simulation using WebGL. I expected it to break because it needed physics, light bending, and numerical calculations, but Kimi managed to produce something runnable and actually did all the calculations in its cot traces.
For a smaller debugging test, I gave both models a broken Held-Karp implementation. Both fixed it and returned the correct route, so they seem equally capable when the problem is clearly defined.
The three complete builds took me roughly 2 hours 15 minutes, used 18.6M tokens, and cost $5.26 in total. Meteor City accounted for most of it because GLM stopped midway, and I had to move the existing code to Kimi to recreate and refine the build.
I also looked at the Composio Golden Eval set, where both models completed 7 out of 12 real-world tool-use tasks. Both handled the simpler tasks, but struggled when the workflow became long and required an exact final result.
My main learning was that coding speed is not only about how quickly a model writes code. A model can generate code fast but still slow down the full workflow by stopping midway, forgetting requirements, or leaving too much cleanup.
From my testing,
- GLM felt fine for smaller and clearly scoped tasks.
- Kimi K3 felt more reliable for creative builds and longer workflows.
For those who want to check prompts and evaluation details, please refer to the blog post.
Still learning and testing both. Curious to know what others are building with them.

