GPT-5.6 Sol Pro is the same underlying model as GPT-5.6 Sol(opens 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-mode(opens in new tab)
Modalities
In / Out Price
$5 / $30per 1M
Context
1M
Released
Jul 9, 2026
Knowledge Cutoff
Feb 2026