GPT-5.6 Terra
GPT-5.6 Terra is OpenAI's mid-tier model, released July 9, 2026, priced at $2 per million input tokens and $12 per million output. It scores 57 on the Artificial Analysis Intelligence Index and generates at roughly 149 tokens per second — more than double the flagship Sol's speed at 40% of its price.
Spec sheet
| Maker | OpenAI |
|---|---|
| Released | 2026-07-09 |
| API ID | gpt-5.6-terra |
| Parameters | Not disclosed |
| Context window | 1M tokens |
| Modalities in | text, image |
| Modalities out | text |
| API availability | OpenAI API · Azure AI Foundry (unverified) |
| Pricing (per MTok) | $2 in / $12 outas of · source |
Benchmarks
| Benchmark | Score | Measured | Source |
|---|---|---|---|
| AA Intelligence Index | 57 | artificialanalysis.ai |
Dashed values are vendor-published and not yet reproduced in our harness — methodology.
Changelog
No tracked changes since publication.
Head-to-head
Profile published August 11, 2026; data last changed August 11, 2026. Every value carries its own measurement or verification date. Flagged values are best-known public figures pending confirmation.