OpenAI: GPT-5.4 vs Z.ai: GLM 5.1
OpenAI: GPT-5.4 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 | Z.ai: GLM 5.1 |
|---|---|---|
| Intelligence Index | 51.4✓ | 40.2 |
| Coding Index | 71.1✓ | 55.8 |
| GPQA Diamond | 92%✓ | 87% |
| Design Arena Elo | 1241✓ | — |
| Speed (tokens/sec) | 60 | 101✓ |
| Latency | 756ms | 304ms✓ |
| Input price /M | $2.50 | $0.966✓ |
| Output price /M | $15.00 | $3.04✓ |
| Context window | 1.1M✓ | 203K |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSON |