GLM-5.3-Flash
ECI#39
151GLM-5.3-Flash is an open-weights model from Z.ai (Zhipu AI), released August 20, 2026. It has an ECI score of 151 and ranks 39th of 247 tracked models. At the time of its release, it ranked 37th of 245 tracked models. At $0.15/Mtok for input tokens and $0.50/Mtok for output tokens, it is less expensive per token than similarly-capable models.
Input price$0.15 / 1M tokens
Output price$0.50 / 1M tokens
Parameters3.2e11
Training compute3.2e24 FLOP
GLM-5.3-Flash vs select alternatives
Reasoning
| Domain | Benchmark | GLM-5.3-Flash | |||
|---|---|---|---|---|---|
ECI scoreBest score 167 | 151 | 150 | 152 | 150 | |
| Ranking | #39 | #46 | #37 | #42 | |
| Games | Chess PuzzlesBest score 72.0% | ||||
Mystery Game PuzzlesBest score 84.0% | |||||
| Mathematics | FrontierMath Tiers 1-3 (v2)Best score 93.7% | ||||
FrontierMath Tier 4 (v2)Best score 97.6% | |||||
OTIS Mock AIME 2024-2025Best score 100.0% | |||||
| Science | CritPtBest score 32.3% | ||||
SciCodeBest score 62.0% | |||||
GPQA DiamondBest score 95.8% | |||||
| Software engineering | Text Arena (Coding)Best score 1797.0 | 1604.4 | 1508.9 | 1593.3 | 1401.6 |