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Kimi K3 vs GLM-5.3-Flash

Kimi K3Moonshot AI
GLM-5.3-FlashZ.ai
Our take

Kimi K3 wins 4 of 4 categories, but GLM-5.3-Flash is 25.3× cheaper for everyday text work. Pick Kimi K3 when quality matters most, GLM-5.3-Flash at volume.

Overall65Best55
Coding74Best69
Writing69Best64
Support73Best67
Value5260Best
Input / 1M$3.00$0.15Best
Output / 1M$15.00$0.50Best
Blended / 1M$6.00$0.24Best
Context window1MBest1M
Open weightsYesYes
Released16 Jul 202626 Aug 2026

Your monthly bill

50k
Kimi K3$1.2k
GLM-5.3-Flash$47.50Cheapest
List prices, a quarter of the tokens as output. Scores are provisional, from Arena and Epoch AI.