Z.ai: GLM 5.1 wins on more metrics (6 of 9), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | Google: Gemini 3.5 Flash | Z.ai: GLM 5.1 |
|---|---|---|
| Intelligence Index | 43.3 | 43.8✓ |
| Coding Index | 47.1✓ | 35.8 |
| GPQA Diamond | 83% | 84%✓ |
| Design Arena Elo | 1328 | 1366✓ |
| Speed (tokens/sec) | 151✓ | 84 |
| Latency | 2.0s | 475ms✓ |
| Input price /M | $1.50 | $0.980✓ |
| Output price /M | $9.00 | $3.08✓ |
| Context window | 1.0M✓ | 203K |
| Capabilities | ReasoningToolsJSONVisionAudio | ReasoningToolsJSON |