OpenAI: GPT-5.6 Terra
GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is suited for everyday coding, reasoning, and agentic...
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 |
Benchmarks
| source | epoch |
|---|---|
| eci | 158.23 |
| confidence | Confident |
| accessibility | API access |
| gpqa | 0.933 |
| gpqaStderr | 0.0154 |
| aime | 0.997 |
| aimeStderr | 0.0028 |
| simpleQA | 0.431 |
| simpleQAStderr | 0.0157 |
Benchmark scores by Epoch AI, CC BY 4.0.
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.