GPT-5.6 Sol Pro is the same underlying model as [GPT-5.6 Sol](https://openrouter.ai/openai/gpt-5.6-sol), 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
Rank
#383
No change
Tokens
23.4M
2026-08-14
Requests
631
631
Tool calls
-
Input / M
$2.50
Output / M
$15
Cache / M
$0.25
Context
1.1M
1,050,000 tokens