GLM 5.2 vs Kimi K3: Which Open Source Model Wins?

Pat Simmons compares GLM 5.2 and Kimi K3 across a broad set of practical tasks, including interactive 3D sites, physics simulations, games, research reports, visual showcases and brand systems. The comparison tracks result quality, completion time and token cost rather than relying on benchmark scores alone.

Kimi K3 is consistently stronger on the difficult coding and design work. It produces more coherent interactions, better visual polish and more complete multi-part outputs, while often reaching those results with fewer failed attempts and lower effective cost despite a higher token price.

GLM 5.2 remains useful when the task is simpler and mostly textual. It can create solid research reports at much lower cost, but its weaker spatial reasoning and design execution make it less dependable for ambitious browser experiences, physics tasks and visually demanding builds.