Z.ai: GLM 5.2 wins on more metrics (5 of 9), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | OpenAI: GPT-5.4 Nano | Z.ai: GLM 5.2 |
|---|---|---|
| Intelligence Index | 38.2 | 50.7✓ |
| Coding Index | 43.9 | 50.7✓ |
| GPQA Diamond | 82% | 90%✓ |
| Design Arena Elo | — | 1369✓ |
| Speed (tokens/sec) | 79✓ | 33 |
| Latency | 519ms✓ | 1.7s |
| Input price /M | $0.200✓ | $1.40 |
| Output price /M | $1.25✓ | $4.40 |
| Context window | 400K | 1.0M✓ |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSON |