Z.ai: GLM 4.5 Air wins on more metrics (6 of 9), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | OpenAI: GPT-5.4 Mini | Z.ai: GLM 4.5 Air |
|---|---|---|
| Intelligence Index | 23.3✓ | 23.2 |
| Coding Index | 25.3✓ | 23.8 |
| GPQA Diamond | 61% | 73%✓ |
| Design Arena Elo | — | 1237✓ |
| Speed (tokens/sec) | — | 54✓ |
| Latency | — | 448ms✓ |
| Input price /M | $0.750 | $0.125✓ |
| Output price /M | $4.50 | $0.850✓ |
| Context window | 400K✓ | 131K |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSON |