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OpenAI: GPT-5.6 Terra Pro

openai/gpt-5.6-terra-pro

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GPT-5.6 Terra Pro is the same underlying model as GPT-5.6 TerraOpens in new tab, 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/reasoning#reasoning-modeOpens in new tab

Modalities

In / Out Price

$2 / $12per 1M

Context

1.1M

Released

Jul 9, 2026

Knowledge Cutoff

Feb 2026

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