About
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
Related Models
Pricing
Input
$1.00
per 1M tokens
Output
$6.00
per 1M tokens
Blended
$2.25
per 1M tokens
Cheaper than 26% of models. Median price is $0.61/1M tokens.
Cost Calculator
Tokens per day1M
100K100M
Daily
$2.25
Monthly
$67.50
vs. Similar Models
OpenAI: GPT-5.6 Luna
$2.250%
Qwen: Qwen3.6 Max Preview
$2.34+4%
GLM-5.1 (Non-reasoning)
$2.15-4%
OpenAI: GPT-5 Image Mini
$2.38+6%
Performance
Context Window
1.1M
tokens
Larger than 96% of models
Max Output
128K
tokens
12% of context
Context Window Comparison
OpenAI: GPT-5.5
1.1MSame
OpenAI: GPT-5.4
1.1MSame
OpenAI GPT Latest
1.1MSame