GPT-6.1 Sol Pro is the same underlying model as GPT-6.1 SolOpens in new tab, served with reasoning.mode set to pro for higher-quality responses on complex tasks.
Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-6.1 Sol and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-6.1 SolOpens in new tab instead.
Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-modeOpens in new tab
Modalities
In / Out Price
$2 / $10per 1M
Context
1.1M
Released
Sep 29, 2026