Head to head
Z.ai: GLM 5.3 Flash vs Claude Opus 5
Live prices, context windows, capabilities, and measured quality — updated continuously.
Side by side
| Metric | Z.ai: GLM 5.3 Flash Z Ai | Claude Opus 5 Anthropic |
|---|---|---|
| Input $/M tokens | $0.075 | $5.00 |
| Output $/M tokens | $0.250 | $25.00 |
| Context window | 1.3M | 1.0M |
| Max output | 131K | 128K |
| WM Score | 95 | 93 |
| Benchmark quality | 93.1 | 97.3 |
| Hosts serving it | 12 | 5 |
| Throughput (tok/s) | 130 | 63 |
| Latency (ms) | 727 | 3444 |
| Vision | ||
| Tools | ||
| Reasoning | ||
| JSON mode |
Which should you pick?
Z.ai: GLM 5.3 Flash costs less per million input tokens — about 66.7× cheaper than Claude Opus 5. Claude Opus 5 scores higher on measured quality. Z.ai: GLM 5.3 Flash 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.