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Gemini 3.8 Flash vs GLM-5.3-Flash

Gemini 3.8 FlashGoogle
GLM-5.3-FlashZ.ai
Our take

Gemini 3.8 Flash wins 3 of 4 categories, but GLM-5.3-Flash is 6.3× cheaper for everyday text work. Pick Gemini 3.8 Flash when quality matters most, GLM-5.3-Flash at volume.

Overall71Best55
Coding6669Best
Writing80Best64
Support78Best67
Value66Best60
Input / 1M$0.75$0.15Best
Output / 1M$3.75$0.50Best
Blended / 1M$1.50$0.24Best
Context window1MBest1M
Open weightsNoYes
Released2 Sept 202626 Aug 2026

Your monthly bill

50k
Gemini 3.8 Flash$300
GLM-5.3-Flash$47.50Cheapest
List prices, a quarter of the tokens as output. Scores are provisional, from Arena and Epoch AI.