Head to head
OpenAI: GPT-5.6 Sol vs Z.ai: GLM 5.3
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 Z Ai |
|---|---|---|
| Input $/M tokens | $2.50 | $1.40 |
| Output $/M tokens | $15.00 | $4.40 |
| Context window | 1.1M | 1.0M |
| Max output | 128K | 131K |
| WM Score | 93 | 91 |
| Benchmark quality | 97.6 | 96.3 |
| Hosts serving it | 3 | 1 |
| Throughput (tok/s) | 53 | 24 |
| Latency (ms) | 3781 | 4957 |
| Vision | ||
| Tools | ||
| Reasoning | ||
| JSON mode |
Which should you pick?
Z.ai: GLM 5.3 costs less per million input tokens — about 1.8× cheaper than OpenAI: GPT-5.6 Sol. OpenAI: GPT-5.6 Sol scores higher on measured quality. OpenAI: GPT-5.6 Sol 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.