GPT-5.6 Luna Pro is the same underlying model as [GPT-5.6 Luna](https://openrouter.ai/openai/gpt-5.6-luna), 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
#39
Down 16% week over week
Tokens
352.1B
2026-09-04
Requests
4.0M
3,955,971
Tool calls
-
Input / M
$0.20
Output / M
$1.20
Cache / M
$0.02
Context
1.1M
1,050,000 tokens