GPT-5.6 Terra
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The capable, lower-cost tier of OpenAI's GPT-5.6 family, available in limited preview through the OpenAI API and Codex for approved organizations.
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Context
1.1M
Input
$2
/1M tok
Output
$12
/1M tok
Blended
$4.50
#414/ 454/1M · 3:1
Speed
119
#47/ 454tok/s
Cache read
$0.20
0.10x input
Cache write
$2.50
1.25x input
Price & speed via Artificial Analysis · ranked across tracked models · caching via OpenRouter
| Reasoning effort | Index | Speed |
|---|---|---|
| max | 56.6 | 119 t/s |
| xhigh | 52.8 | 94 t/s |
| high | 50.1 | 89 t/s |
| medium | 46.8 | 85 t/s |
| low | 41.3 | 84 t/s |
| Non-reasoning | 34.6 | 83 t/s |
Intelligence Index per reasoning-effort setting, via Artificial Analysis · pricing identical across tiers
Reported on 20 evals across 12 domains - best 82.9% on MedScribe · #29 of 70
Reported eval scores
20TaxEval v276.2
CorpFin v265.3
MortgageTax67.3
IFBench59.7
SciCode44.6
GPQA Diamond74.6
Vals Index59.6
EQ-Bench 41234
MedCode43.4
MedScribe82.9
SAGE47