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 | Anthropic: Claude Opus 4.8 | Z.ai: GLM 5.2 |
|---|---|---|
| Intelligence Index | 55.7✓ | 50.7 |
| Coding Index | 56.7✓ | 50.7 |
| GPQA Diamond | 92%✓ | 90% |
| Design Arena Elo | 1373✓ | 1369 |
| Speed (tokens/sec) | — | 33✓ |
| Latency | — | 1.7s✓ |
| Input price /M | $5.00 | $1.40✓ |
| Output price /M | $25.00 | $4.40✓ |
| Context window | 1M | 1.0M✓ |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSON |