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GPT-6 Sol vs GLM-5.3-Flash

GPT-6 SolOpenAI
GLM-5.3-FlashZ.ai
Our take

GLM-5.3-Flash wins 4 of 4 categories and costs less: 16.8× cheaper for everyday text work. Easy pick.

Overall5255Best
Coding6269Best
Writing3664Best
Support3767Best
Value4260Best
Input / 1M$2.00$0.15Best
Output / 1M$10.00$0.50Best
Blended / 1M$4.00$0.24Best
Context window1.1MBest1M
Open weightsNoYes
Released22 Sept 202626 Aug 2026

Your monthly bill

50k
GPT-6 Sol$800
GLM-5.3-Flash$47.50Cheapest
List prices, a quarter of the tokens as output. Scores are provisional, from Arena and Epoch AI.