Head to head
Anthropic: Claude Opus 4.8 vs Z.ai: GLM 5.2
Live prices, context windows, capabilities, and measured quality — updated continuously.
Side by side
| Metric | Anthropic: Claude Opus 4.8 Anthropic | Z.ai: GLM 5.2 Z Ai |
|---|---|---|
| Input $/M tokens | $5.00 | $0.462 |
| Output $/M tokens | $25.00 | $1.45 |
| Context window | 1.0M | 1.0M |
| Max output | 128K | 131K |
| WM Score | 86 | 85 |
| Benchmark quality | 86.9 | 82.5 |
| Hosts serving it | 4 | 27 |
| Throughput (tok/s) | 69 | 113 |
| Latency (ms) | 1080 | 470 |
| Vision | ||
| Tools | ||
| Reasoning | ||
| JSON mode |
Which should you pick?
Z.ai: GLM 5.2 costs less per million input tokens — about 10.8× cheaper than Anthropic: Claude Opus 4.8. Anthropic: Claude Opus 4.8 scores higher on measured quality. Z.ai: GLM 5.2 takes a larger context window, which matters for long documents or big codebases. Prices here are live list prices; the same model can cost less on a different host, so check the model page for the cheapest offering.