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Kimi K3.1 Pro vs GLM-5.3-Flash

Kimi K3.1 ProMoonshot AI
GLM-5.3-FlashZ.ai
Our take

Kimi K3.1 Pro wins 1 of 1 categories, but GLM-5.3-Flash is 16.8× cheaper for everyday text work. Pick Kimi K3.1 Pro when quality matters most, GLM-5.3-Flash at volume.

Overall–55
Coding79Best69
Writing–64
Support–67
Value–60
Input / 1M$2.00$0.15Best
Output / 1M$10.00$0.50Best
Blended / 1M$4.00$0.24Best
Context window1MBest1M
Open weightsNoYes
Released23 Oct 202626 Aug 2026

Your monthly bill

50k
Kimi K3.1 Pro$800
GLM-5.3-Flash$47.50Cheapest
List prices, a quarter of the tokens as output. Scores are provisional, from Arena and Epoch AI.