OpenAI: GPT-5.1 wins on more metrics (6 of 9), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | OpenAI: GPT-5.1 | Z.ai: GLM 5 Turbo |
|---|---|---|
| Intelligence Index | 47.7✓ | 46.8 |
| Coding Index | 44.7✓ | 36.8 |
| GPQA Diamond | 87%✓ | 85% |
| Design Arena Elo | 1249 | 1337✓ |
| Speed (tokens/sec) | 65✓ | 14 |
| Latency | 994ms✓ | 2.1s |
| Input price /M | $1.25 | $1.20✓ |
| Output price /M | $10.00 | $4.00✓ |
| Context window | 400K✓ | 262K |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSON |