OpenAI: GPT-5.6 Terra vs Z.ai: GLM 5.2
OpenAI: GPT-5.6 Terra wins on more metrics (5 of 8), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | OpenAI: GPT-5.6 Terra | Z.ai: GLM 5.2 |
|---|---|---|
| Intelligence Index | 55.0✓ | 51.1 |
| Coding Index | 76.7✓ | 68.8 |
| GPQA Diamond | 93%✓ | 90% |
| Design Arena Elo | — | — |
| Speed (tokens/sec) | 87✓ | 75 |
| Latency | 1.7s | 602ms✓ |
| Input price /M | $2.50 | $0.540✓ |
| Output price /M | $15.00 | $1.76✓ |
| Context window | 1.1M✓ | 1.0M |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSON |