Head to head
OpenAI: GPT-5.6 Sol vs Z.ai: GLM 5.3 Flash
Live prices, context windows, capabilities, and measured quality — updated continuously.
Side by side
| Metric | OpenAI: GPT-5.6 Sol Openai | Z.ai: GLM 5.3 Flash Z Ai |
|---|---|---|
| Input $/M tokens | $2.00 | $0.075 |
| Output $/M tokens | $10.00 | $0.250 |
| Context window | 1.1M | 1.3M |
| Max output | 128K | 131K |
| WM Score | 89 | 89 |
| Benchmark quality | 89.5 | 83.1 |
| Hosts serving it | 3 | 24 |
| Throughput (tok/s) | 68 | 76 |
| Latency (ms) | 3892 | 531 |
| Vision | ||
| Tools | ||
| Reasoning | ||
| JSON mode |
Which should you pick?
Z.ai: GLM 5.3 Flash costs less per million input tokens — about 26.7× cheaper than OpenAI: GPT-5.6 Sol. OpenAI: GPT-5.6 Sol 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.