Head to head
OpenAI: GPT-5.6 Terra vs OpenAI: GPT-6 Astra
Live prices, context windows, capabilities, and measured quality — updated continuously.
Side by side
| Metric | OpenAI: GPT-5.6 Terra Openai | OpenAI: GPT-6 Astra Openai |
|---|---|---|
| Input $/M tokens | $1.00 | $5.00 |
| Output $/M tokens | $6.00 | $25.00 |
| Context window | 1.1M | 1.1M |
| Max output | 128K | 128K |
| WM Score | 87 | 86 |
| Benchmark quality | 86.7 | 90.3 |
| Hosts serving it | 3 | 2 |
| Throughput (tok/s) | 64.5 | 53 |
| Latency (ms) | 2694 | 2338 |
| Vision | ||
| Tools | ||
| Reasoning | ||
| JSON mode |
Which should you pick?
OpenAI: GPT-5.6 Terra costs less per million input tokens — about 5.0× cheaper than OpenAI: GPT-6 Astra. OpenAI: GPT-6 Astra scores higher on measured quality. 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.