Z.ai: GLM 5 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 Mini | Z.ai: GLM 5 |
|---|---|---|
| Intelligence Index | 38.9 | 40.6✓ |
| Coding Index | 32.8 | 39.0✓ |
| GPQA Diamond | 80%✓ | 67% |
| Design Arena Elo | 1199 | 1313✓ |
| Speed (tokens/sec) | 71 | 95✓ |
| Latency | 1.8s | 384ms✓ |
| Input price /M | $0.250✓ | $0.600 |
| Output price /M | $2.00 | $1.92✓ |
| Context window | 400K✓ | 203K |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSON |