Head to head
Claude Opus 5 vs Z.ai: GLM 5.3 Flash
Live prices, context windows, capabilities, and measured quality — updated continuously.
Side by side
| Metric | Claude Opus 5 Anthropic | Z.ai: GLM 5.3 Flash Z Ai |
|---|---|---|
| Input $/M tokens | $5.00 | $0.075 |
| Output $/M tokens | $25.00 | $0.250 |
| Context window | 1.0M | 1.3M |
| Max output | 128K | 131K |
| WM Score | 91 | 89 |
| Benchmark quality | 93.8 | 83.1 |
| Hosts serving it | 5 | 24 |
| Throughput (tok/s) | 66 | 89 |
| Latency (ms) | 2507 | 490 |
| 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.