OpenAI: GPT-5.6 Terra Pro
GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/gpt-5.6-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reas
Everything else
| Max output | 128K |
|---|---|
| Input / 1M | $1.25 |
| Output / 1M | $7.50 |
| Cache read / 1M | $0.125 |
| Cache write / 1M | $1.56 |
| 1M in + 1M out | $8.75 |
| Takes | file, image, text |
| Returns | text |
| Tools | yes |
| Reasoning | optional · max, xhigh, high, medium, low, none |
| Open weights | no |
| Released | 2026-07-09 |
| Knowledge cutoff | 2026-02-16 |
| Retires | — |
| Catalog id | openai/gpt-5.6-terra-pro |
Using it
In 00, this model is picked per agent — and per tier, so the model that answers your customers need not be the one that writes your code. Get 00.