Z.ai: GLM 5.2 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 | Z.ai: GLM 5.2 |
|---|---|---|
| Intelligence Index | — | 50.7✓ |
| Coding Index | 41.0 | 50.7✓ |
| GPQA Diamond | 75% | 90%✓ |
| Design Arena Elo | 1301 | 1369✓ |
| Speed (tokens/sec) | 64✓ | 33 |
| Latency | 864ms✓ | 1.7s |
| Input price /M | $2.50 | $1.40✓ |
| Output price /M | $15.00 | $4.40✓ |
| Context window | 1.1M✓ | 1.0M |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSON |